What you will find here
Calc Labz guides are written to add context around the calculator output: what the formula means, where the assumptions break, how Indian rules or pricing conventions affect the result, and what to verify before acting on it.
- India-focused finance and tax explainers for loans, salary, deductions, and investing.
- Health and education guides that translate common formulas into practical interpretation.
- Everyday decision guides for bills, travel, budgeting, shopping, and planning.
Finance
How to Calculate EMI in India 2026
Complete guide to home loan, car loan and personal loan EMI calculation with examples.
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Finance
SIP Calculator: Grow ₹5,000/month to ₹1 Crore
See how a simple SIP in mutual funds can build massive wealth over 20 years.
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Tax
GST Calculator: CGST, SGST & IGST Explained 2026
Understand how GST is calculated, what CGST/SGST/IGST mean, and common GST rates.
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Health
BMI Chart India 2026: Are You in Healthy Range?
BMI ranges for Indian adults, limitations of BMI, and how to improve your health score.
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Tax
Old vs New Tax Regime: Which Saves More in FY 2025-26?
Side-by-side comparison of old and new tax regimes for salaried employees in India.
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Education
CGPA to Percentage Converter + Formula 2026
How to convert CGPA to percentage for VTU, Mumbai, CBSE and other Indian universities.
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Finance
Fixed Deposit Calculator: Best FD Rates & Maturity 2026
Compare FD interest rates, calculate maturity amount, and learn about tax on FD interest.
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Finance
PPF Calculator: Tax-Free Returns & 15-Year Maturity 2026
Complete guide to Public Provident Fund — interest rate, lock-in, tax benefits and maturity.
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Finance
Compound Interest: The 8th Wonder of the World
Understand how compound interest works, daily vs monthly compounding, and the Rule of 72.
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Finance
Home Loan EMI Guide: Eligibility & Tax Benefits 2026
Everything about home loan EMI, eligibility criteria, tax deductions under 80C and 24(b).
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Finance
Inflation Calculator: How Inflation Erodes Your Money
Learn how 6% inflation makes ₹1 lakh worth only ₹55,839 in 10 years and how to beat it.
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Finance
ROI & CAGR Calculator: Measure Investment Returns
How to calculate ROI, CAGR, and absolute returns on stocks, mutual funds and real estate.
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Health
TDEE Calculator: How Many Calories Do You Really Need?
Calculate Total Daily Energy Expenditure based on activity level for weight loss or gain.
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Health
BMR Calculator: Understanding Your Resting Metabolism
What is Basal Metabolic Rate, how is it calculated, and why it matters for weight management.
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Health
Sleep Calculator: Optimal Bedtime & Wake-Up Times
Based on 90-minute sleep cycles, find the best bedtime to wake up refreshed and energized.
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Health
Water Intake Calculator: Daily Hydration Guide 2026
How much water you should drink based on weight, activity level and health conditions.
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Health
Calories Burned Calculator: Exercise & Fat Loss Guide
MET-based calorie burn estimates for walking, running, cycling, swimming, HIIT and more.
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Health
Macro Calculator: Protein, Carbs & Fat for Your Goals
Optimal macro ratios for weight loss, maintenance, and muscle gain with daily gram targets.
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Math
Percentage Calculator: Tricks, Formulas & Examples
Master percentage calculations — increase, decrease, difference, and reverse percentages.
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Lifestyle
Age Calculator: Exact Age in Years, Months & Days
Calculate your precise age, days lived, weeks count, and countdown to your next birthday.
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Finance
In-Hand Salary Calculator: CTC to Take-Home Breakdown
Understand how CTC converts to in-hand salary with PF, professional tax, and TDS deductions. Worked example for ₹12 L...
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Finance
HRA Exemption Calculator: How to Claim Maximum HRA
Learn the three-condition HRA calculation, metro vs non-metro rules, and documentation needed to claim maximum HRA ex...
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Finance
Gratuity Calculator: Eligibility, Formula & Taxation
Gratuity formula explained with the 26-day divisor, eligibility rules, tax exemption limits, and worked examples.
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Tax
Income Tax Calculator FY 2025-26: Slab Rates & Deductions
Complete income tax slab comparison for FY 2025-26 old vs new regime with worked examples and decision framework.
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Tax
Section 80C Deductions: Complete List & Tax Saving Guide
All 80C eligible investments compared by returns, lock-in, and risk. Strategy by life stage to maximize ₹1.5 lakh limit.
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Tax
TDS Calculator: Rates, Sections & How to Avoid Excess TDS
Complete TDS guide covering section-wise rates, Form 15G/15H, Form 26AS verification, and how to claim TDS refund.
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Tax
Advance Tax Calculator: Due Dates & Penalty for Late Payment
Quarterly advance tax due dates, who must pay, penalty calculation, and step-by-step payment process for freelancers ...
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Tax
Professional Tax in India: State-Wise Rates & Exemptions
Professional tax rates for Maharashtra, Karnataka, Tamil Nadu, Telangana, West Bengal, Gujarat and other states with ...
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Tax
Capital Gains Tax Calculator: STCG & LTCG on Shares, Property
Capital gains tax rates for equity, debt, property, and gold with holding periods, worked examples, and tax-saving st...
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Finance
Salary Hike Calculator: How to Calculate & Negotiate Your Raise
Calculate salary hike percentage, see after-tax impact at different CTC levels, and use data-driven negotiation strat...
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Finance
CTC Breakup Explained: Basic, HRA, PF & Special Allowance
Decode your CTC salary structure — what each component means, how it affects tax, and why higher basic isn’t always b...
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Tax
Freelancer Tax Guide: ITR Filing, TDS & Deductions in India
Complete tax guide for Indian freelancers covering ITR-3 vs ITR-4, presumptive taxation under 44ADA, advance tax, and...
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Tax
ESOP Taxation in India: Exercise, Sale & Tax Implications
How ESOPs are taxed at exercise (perquisite) and at sale (capital gains). Includes worked example and tax planning st...
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Finance
Leave Encashment Calculator: Tax Rules & Exemption Limits
Leave encashment tax exemption rules for government and private employees, calculation formula, and exemption limit o...
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Tax
GST Invoice Calculator: How to Create GST-Compliant Invoices
Mandatory fields for valid GST invoices, CGST/SGST vs IGST rules, invoice numbering, and common compliance mistakes.
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Finance
Car Loan EMI Calculator: Interest Rates & Down Payment Guide
Calculate car loan EMI, compare interest rates across banks, and find the optimal down payment to minimize total cost.
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Finance
Loan Eligibility Calculator: How Much Loan Can You Get?
Banks use FOIR, CIBIL score, and income multiples to decide your loan. Learn the formula and maximize your eligibility.
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Finance
Loan Prepayment Calculator: How Prepaying Saves Lakhs in Interest
See how one extra EMI per year can cut 7 years off a 20-year home loan. Prepayment strategies and when to avoid them.
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Finance
Home Loan Down Payment: How Much Do You Really Need?
20% vs 10% down payment comparison, PMI impact, and strategies to save for your home down payment faster.
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Finance
Home Loan Balance Transfer: When to Switch Your Loan
When balance transfer saves money, the breakeven calculation, processing costs, and step-by-step transfer process.
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Finance
Business Loan Calculator: Eligibility, Rates & EMI
Business loan eligibility criteria, interest rates comparison, CGTMSE collateral-free loans, and EMI calculation exam...
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Finance
Education Loan Calculator: Interest Rates & Repayment Guide
Education loan interest rates in India, moratorium period explained, Section 80E tax benefit, and repayment strategies.
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Finance
Loan Comparison Calculator: Compare Offers Side by Side
How to compare loan offers by total cost, not just interest rate. Includes fees, tenure impact, and comparison framew...
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Finance
Rent vs Buy Calculator: Should You Rent or Buy a Home in India?
The price-to-rent ratio, opportunity cost of down payment, and a data-driven framework to decide between renting and ...
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Finance
Simple Interest vs Compound Interest: Key Differences Explained
How simple and compound interest differ, when each applies, and why the gap grows dramatically over time with worked ...
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Finance
Lumpsum Investment Calculator: When to Invest a Lump Sum vs SIP
When lumpsum beats SIP, the math behind time-in-market vs timing-the-market, and a decision framework for windfall mo...
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Finance
Step-Up SIP Calculator: How Annual SIP Increases Grow Your Corpus
A 10% annual SIP step-up can double your corpus vs flat SIP. See the compounding math and optimal step-up percentages.
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Finance
SWP Calculator: Create Monthly Income from Mutual Funds
How Systematic Withdrawal Plans work, tax efficiency vs FD interest, and how to structure SWP for retirement income.
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Finance
CAGR Calculator: Measure Your True Investment Growth Rate
What CAGR is, why it beats absolute returns for comparison, and how to calculate it for stocks, mutual funds, and rea...
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Finance
ELSS vs PPF vs Tax Saver FD: Best 80C Investment Compared
Lock-in, returns, risk, and liquidity comparison of the three most popular 80C investment options with data-backed re...
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Finance
Mutual Fund Returns Calculator: CAGR vs XIRR vs Absolute Returns
Why different return metrics give different numbers for the same fund. When to use CAGR, XIRR, and absolute returns.
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Finance
XIRR Calculator: True Returns on SIP & Irregular Investments
XIRR accounts for timing of each cash flow, making it the only accurate metric for SIP returns. Worked examples inside.
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Finance
Goal-Based SIP Calculator: How Much SIP for Your Target Corpus?
Reverse-calculate the monthly SIP needed for goals like child education, house down payment, or retirement corpus.
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Finance
Dividend Yield Calculator: Evaluate Stocks for Passive Income
How to calculate dividend yield, what constitutes a good yield, and the tax treatment of dividends in India.
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Finance
Gold Investment Calculator: Physical vs Digital vs Gold ETF
Compare physical gold, Sovereign Gold Bonds, Gold ETFs, and digital gold by returns, taxation, liquidity, and safety.
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Finance
Stock Returns Calculator: Calculate Profit, Charges & Net Return
Calculate net stock trading returns after brokerage, STT, GST, SEBI charges, and stamp duty with worked examples.
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Finance
Asset Allocation Calculator: Build a Balanced Portfolio
Age-based, risk-based, and goal-based asset allocation strategies with equity-debt-gold split recommendations.
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Finance
NPS Calculator: Returns, Tax Benefits & Retirement Planning
NPS Tier 1 vs Tier 2, tax benefits under 80CCD, annuity rules at 60, and how NPS fits into your retirement plan.
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Finance
EPF Calculator: Interest Rate, Balance Check & Withdrawal Rules
EPF contribution calculation, current 8.25% interest rate, partial withdrawal rules, and tax implications of early wi...
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Finance
Retirement Calculator: How Much Corpus Do You Need in India?
The 25× rule, inflation-adjusted corpus calculation, and a step-by-step framework to estimate your retirement number.
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Finance
FIRE Calculator: Financial Independence & Early Retirement in India
FIRE number calculation, savings rate math, lean vs fat FIRE, and why the 4% withdrawal rule needs adjustment for India.
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Finance
Emergency Fund Calculator: How Much Should You Save?
6 months vs 12 months debate, where to park your emergency fund, and a step-by-step building strategy.
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Finance
Sukanya Samriddhi Yojana Calculator: Interest Rate & Benefits
SSY current rate (8.2%), deposit rules, partial withdrawal for education, and how it compares to PPF and FD for girl ...
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Finance
Recurring Deposit Calculator: Monthly Savings with Guaranteed Returns
RD interest calculation with quarterly compounding, comparison with SIP, and when RD makes sense over mutual funds.
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Finance
Atal Pension Yojana Calculator: Guaranteed Pension of ₹1K–5K/Month
APY contribution chart by age, government co-contribution, tax benefits, and whether APY alone is enough for retirement.
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Finance
NSC Calculator: National Savings Certificate Interest & Tax Benefits
NSC current rate (7.7%), 5-year maturity calculation, 80C eligibility, and comparison with PPF and tax saver FD.
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Finance
SCSS Calculator: Senior Citizens Savings Scheme Interest & Benefits
SCSS 8.2% rate, ₹30L investment limit, quarterly interest payout, tax treatment, and premature withdrawal rules.
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Finance
Savings Goal Calculator: How Much to Save Monthly for Any Goal
Reverse-calculate monthly savings needed for a car, vacation, wedding, or any financial goal at different return rates.
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Finance
SIP vs Lumpsum: Which Investment Strategy Wins?
Historical data comparison of SIP vs lumpsum across market cycles, rupee cost averaging explained, and when each wins.
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Finance
FD Interest Rates 2026: Best Fixed Deposit Rates Compared
Top bank FD rates compared, senior citizen premiums, cumulative vs non-cumulative, and tax-saving FD rules.
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Finance
Real Returns Calculator: What Your Investments Earn After Inflation
Why 12% mutual fund returns are really 5–6% after inflation and tax. The formula for real returns and what it means f...
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Finance
Credit Card Payoff Calculator: Escape the Minimum Payment Trap
Why paying minimum takes 30+ years to clear a ₹1L balance, the snowball vs avalanche method, and optimal payoff strat...
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Health
Body Fat Calculator: How to Measure & Interpret Your Body Fat %
Navy method, skinfold, and DEXA compared. What your body fat percentage means, healthy ranges by age and gender, and ...
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Health
Ideal Weight Calculator: Find Your Healthy Weight Range
BMI-based, Devine, and Robinson formulas compared. Why BMI alone misses the picture and what metrics to track instead.
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Health
Protein Calculator: How Much Protein Do You Need Daily?
Protein needs by activity level, body weight, and fitness goals. Vegetarian vs non-veg sources ranked by protein-per-...
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Health
Calorie Deficit Calculator: The Science of Sustainable Fat Loss
How to calculate your calorie deficit, safe weekly loss rates, and why crash diets backfire. Includes TDEE-based meal...
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Health
Pregnancy Due Date Calculator: Week-by-Week Timeline
How due dates are calculated, trimester milestones, and key prenatal checkup schedule from conception to delivery.
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Health
Ovulation Calculator: Track Your Fertile Window
How to calculate your fertile days, signs of ovulation, and when cycle tracking works (and when it doesn’t) for famil...
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Health
Heart Rate Zones Calculator: Optimize Your Training
The 5 heart rate zones explained, how to find your max HR, and which zone to train in for fat loss, endurance, or per...
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Health
One Rep Max Calculator: Estimate Your 1RM for Any Lift
Epley, Brzycki, and Lombardi formulas compared. How to use your 1RM for programming sets and reps safely.
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Health
BMI Calculator for Indians: Why Asian Cutoffs Matter
Standard vs Asian BMI cutoffs, why Indians face higher metabolic risk at lower BMI, and when to look beyond BMI.
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Health
Body Recomposition: Build Muscle and Lose Fat Simultaneously
The science behind recomp, who it works for, calorie and protein requirements, and realistic timelines for visible re...
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Health
Running Pace Calculator: Target Times for 5K, 10K & Marathon
Calculate pace per km/mile, predict race finish times, and find your ideal training paces for different distances.
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Health
Sleep Debt Calculator: How Much Sleep Do You Owe Your Body?
How sleep debt accumulates, whether you can repay it, and strategies for recovery without disrupting your schedule.
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Health
Smoking Cost Calculator: What Cigarettes Really Cost You
Beyond the price per pack: lifetime financial cost, health cost estimates, and what you could invest instead.
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Education
Attendance Calculator: Track & Meet Your 75% Requirement
Calculate current attendance percentage, how many classes you can skip, and how many you need to attend to reach the ...
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Education
GPA Calculator: CGPA to Percentage & 4.0 Scale Conversion
Convert between CGPA, percentage, and 4.0 GPA scale. Includes university-specific conversion tables and grade point f...
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Education
Grade Calculator: What Score Do You Need on Your Final Exam?
Reverse-calculate the minimum final exam score needed to achieve your target grade, weighted by assignment categories.
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Education
Percentile Calculator: Understand Your Exam Ranking
What percentile means vs percentage, how JEE/NEET percentiles work, and how to interpret your rank from percentile sc...
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Education
Study Hours Calculator: How Much Time to Prepare for Exams
Evidence-based study hour recommendations by exam type, the spacing effect, and how to create an effective study sche...
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Education
Pomodoro Technique: The 25-Minute Study Method That Works
How the Pomodoro technique boosts focus, when to use longer intervals, and adapting it for different types of study m...
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Education
Exam Score Calculator: Marks to Percentage & Grade Conversion
Convert raw marks to percentage, find your grade, and understand grading scales used by CBSE, ICSE, and universities.
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Education
Education Loan vs Self-Funding: Which Is Smarter?
The opportunity cost framework for deciding whether to borrow for education or use savings, with ROI analysis by cour...
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Everyday
Electricity Bill Calculator: Understand Units, Tariffs & Save Money
How electricity slab rates work, which appliances consume most, and practical tips to cut your bill by 20–30%.
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Everyday
Fuel Cost Calculator: Plan Your Trip Expenses Accurately
Calculate fuel costs for any trip distance, compare petrol vs diesel vs CNG economics, and find your real per-km runn...
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Everyday
Mileage Calculator: Track Your Vehicle’s Real Fuel Efficiency
How to accurately measure kmpl, why dashboard readings differ from reality, and tips to improve your car’s mileage by...
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Everyday
Discount Calculator: Calculate Real Savings on Sales & Offers
Original price vs sale price, stacked discounts, "up to X% off" traps, and how to calculate if a deal is actually wor...
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Everyday
Tip Calculator: How Much to Tip in India and Abroad
Tipping etiquette by country and service type, when service charge already covers it, and splitting tips in groups.
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Everyday
Wedding Budget Calculator: Plan Your Indian Wedding Expenses
Average wedding costs by city, budget allocation framework (venue 30%, food 25%, decor 15%), and money-saving strateg...
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Everyday
Household Budget Calculator: The 50/30/20 Rule for Indian Families
Divide income into needs, wants, and savings. Track expenses, find leaks, and build a budget that actually works.
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Everyday
EV vs Petrol Car: Total Cost of Ownership Comparison India 2026
Upfront cost, running cost, maintenance, battery replacement, and 10-year total cost comparison with real numbers.
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Everyday
Freelance Rate Calculator: How to Price Your Work
Calculate your minimum viable hourly rate based on expenses, desired income, and billable hours. Includes market rate...
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Everyday
Stamp Duty Calculator: Property Registration Charges by State
State-wise stamp duty rates, registration fees, who pays in joint property, and how women buyers get lower rates.
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Everyday
Rent Affordability Calculator: How Much Rent Can You Afford?
The 30% rule, factors beyond rent (maintenance, travel cost), and a framework to decide between cheaper suburbs vs ex...
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Finance
Credit Utilization Calculator: Improve Your CIBIL Score
Why keeping credit utilization below 30% matters, how it impacts your CIBIL score, and strategies to lower it quickly.
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Finance
Debt Avalanche Calculator: The Fastest Way to Be Debt-Free
Avalanche vs snowball method compared. Which saves more interest, which keeps you motivated, and a step-by-step payof...
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Finance
Insurance Need Calculator: How Much Life Cover Do You Need?
The income replacement method, HLV formula, and why most Indians are severely underinsured. Includes term vs endowmen...
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Finance
Net Worth Calculator: Track Your Financial Health
Assets minus liabilities = your real financial position. How to calculate, track, and grow your net worth systematica...
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Finance
TCS on Remittance: Foreign Transfer Tax Calculation 2026
TCS rates on foreign remittance under LRS, education payments, and travel. How to claim refund while filing ITR.
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Finance
HRA vs Home Loan: Which Tax Benefit Is Better?
Can you claim both HRA and home loan deduction? Rules for renting and owning simultaneously, and which saves more tax.
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Finance
Break-Even Calculator: When Does Your Business Turn Profitable?
Fixed costs, variable costs, and the break-even formula. How many units or months until your business stops losing mo...
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Finance
Car Lease vs Buy Calculator: Which Option Saves More?
Total cost comparison of leasing vs buying over 5 years. Depreciation, tax implications, and when leasing makes finan...
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Finance
Tax Saving Investment Planner: Maximize 80C, 80D & NPS Benefits
Complete guide to tax-saving investments under old regime. 80C options ranked by returns, lock-in, and liquidity.
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Finance
Brokerage Calculator: Calculate Your Trading Costs & Charges
Zerodha, Groww, Angel One brokerage compared. STT, GST, SEBI charges, and how trading costs eat into your returns.
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Finance
NPV & IRR Calculator: Evaluate Project Profitability
Net Present Value and Internal Rate of Return explained. When to use each, worked examples, and common pitfalls.
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Finance
Loan Affordability: How Much Can You Safely Borrow?
The 40% FOIR rule, debt-to-income ratio, and how banks calculate your maximum loan eligibility based on income.
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Health
Blood Pressure Chart: Normal Ranges & What They Mean
Systolic vs diastolic explained, what your reading means, risk factors, and when to see a doctor.
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Health
VO2 Max Calculator: Measure Your Aerobic Fitness Level
What VO2 max is, how to estimate it without lab tests, age-based benchmarks, and training to improve it.
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Health
Diabetes Risk Calculator: Assess Your Type 2 Risk Score
Key risk factors including BMI, waist circumference, family history, and the IDRS scoring system for Indians.
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Health
Child Height Predictor: Estimate Your Child's Adult Height
Mid-parent height formula, bone age method, growth charts by age, and factors that affect final height.
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Health
Lean Body Mass Calculator: Know Your True Muscle Mass
Boer, James, and Hume formulas compared. Why lean mass matters more than weight for fitness and metabolism.
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Education
GPA Planner: Target GPA & Required Grades Calculator
Calculate exactly what grades you need in remaining semesters to reach your target CGPA for placements or grad school.
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Education
Cutoff Predictor: JEE, NEET & Engineering Exam Cutoffs
How cutoffs are calculated, category-wise trends, and using rank vs marks to predict your chances at top colleges.
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Everyday
Solar Panel Calculator: ROI, Savings & Payback Period
Rooftop solar costs in India, net metering savings, government subsidies, and break-even timeline by state.
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Everyday
Construction Cost Calculator: Estimate Building Cost in India
Per sq ft rates by city and tier, material costs, labour charges, and hidden costs most people miss.
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Everyday
Travel Budget Calculator: Plan Your Trip Expenses
Budget frameworks for domestic and international trips. Flight, hotel, food, and activity cost estimates by destination.
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Editorial note: Our guides are meant to support, not replace, official documentation or professional advice. See the Editorial Policy for our review approach.
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