BMI Calculator
Body Mass Index with category & ideal weight
Quick Answer — BMI Range
A person weighing 70 kg at 175 cm height has a BMI of 22.9 — Normal weight. BMI under 18.5 is underweight, 18.5–24.9 is normal, 25–29.9 is overweight, and 30+ is obese. For Asians, health risks increase above 23.
Maintained by: Sagar Sahni, Calc Labz | Review: formula checks, worked examples, and periodic updates
Use with care: Health outputs are informational estimates only and do not replace medical advice.
Need a correction? Contact us with the calculator name and the issue you found.
Formula & Worked Example
The math behind the BMI Calculator
Mathematical Formula
BMI = \frac{Weight \; (kg)}{Height^2 \; (m^2)}Step-by-Step Worked Example
Frequently Asked Questions
Common questions about the BMI Calculator
What is a healthy BMI range?
Is BMI accurate for athletes and muscular people?
What BMI is considered obese?
How can I improve my BMI?
Is BMI valid for children and teenagers?
What is the BMI Calculator?
The BMI Calculator determines your Body Mass Index — a widely used screening tool to categorize weight status. Our calculator uses both WHO and Asian-specific BMI categories, which is important because Asians have higher health risks at lower BMI values. Simply enter your weight and height to get your BMI with a detailed interpretation of what it means for your health.
How to Use the BMI Calculator
- Enter Weight: Enter your weight (in kg) in the input field. The calculator will validate your input automatically.
- Enter Height: Enter your height (in cm) in the input field. The calculator will validate your input automatically.
- View Your Results: The BMI Calculator displays your results instantly in the output panel. You will see the primary result along with a detailed breakdown of secondary outputs. Scroll down for charts, interpretations, and expert advice.
Key Features
- Instant BMI calculations with real-time updates
- No signup, no registration — 100% free forever
- All calculations happen in your browser — zero data sent to servers
- Works offline as a Progressive Web App (PWA)
- Mobile-friendly responsive design
- Verified health & fitness formulas updated for 2026
Why Use Calc Labz BMI Calculator?
The Calc Labz BMI Calculator stands out because it combines accuracy with simplicity. Unlike other online calculators, we provide detailed breakdowns, step-by-step formulas, and actionable advice alongside your results. Our health & fitness calculators are regularly updated to reflect current rates, rules, and standards for India (2026). Whether you are a student, professional, or just need a quick calculation — Calc Labz delivers reliable results instantly.
Key Terms & Glossary
- BMI
- Body Mass Index — a screening tool that estimates body fat using weight and height (kg/m²).
- BMR
- Basal Metabolic Rate — the number of calories your body burns at complete rest to maintain vital functions.
- TDEE
- Total Daily Energy Expenditure — total calories burned per day including BMR, activity, and thermic effect of food.
- Macros
- Macronutrients: protein, carbohydrates, and fats — the three main nutrients that provide energy (calories).
- Caloric Deficit
- Consuming fewer calories than your TDEE, causing your body to use stored fat for energy, leading to weight loss.
- Body Fat %
- The percentage of your total body weight that is composed of fat tissue, as opposed to lean mass.
Sources & References
Our BMI Calculator uses formulas and guidelines from the following authoritative sources: