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BaseGST18%

GST Calculator

Add GST to net price — CGST, SGST & IGST split

Quick Answer — GST Calculation

To add 18% GST to ₹1,000: GST = ₹180, Total = ₹1,180. To remove GST: Original price = ₹1,180 ÷ 1.18 = ₹1,000. CGST and SGST are each 9% for intra-state transactions.

Standard Formula Updated 2026
₹
₹1,000
₹10,000₹2,00,00,000

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Free forever Data stays on your device Works offline (PWA) Verified formulas

Maintained by: Sagar Sahni, Calc Labz  |  Review: formula checks, worked examples, and periodic updates

Use with care: Finance and tax outputs are planning estimates only and should be checked against current rules.

Need a correction? Contact us with the calculator name and the issue you found.

Formula & Worked Example

The math behind the GST Calculator

Mathematical Formula

GST = \frac{Original \; Price \times GST \; Rate}{100}
For adding GST: - **Total Price = Original Price + GST Amount** For removing GST: - **Original Price = Total Price / (1 + Rate / 100)** - **GST Amount = Total Price - Original Price**

Step-by-Step Worked Example

Suppose the net price of an item is **₹1,000** and GST rate is **18%**. - GST Amount = (1,000 × 18) / 100 = **₹180** - Total Price including GST = 1,000 + 180 = **₹1,180**

Frequently Asked Questions

Common questions about the GST Calculator

What are the current GST rates in India?
India has four GST slabs: 5% (essential goods), 12% (standard goods), 18% (most services and goods), and 28% (luxury goods, sin goods). Some items like fresh food, milk, and healthcare are GST-exempt (0%).
What is the difference between CGST, SGST, and IGST?
For intra-state transactions (within the same state), GST is split equally into CGST (Central GST) and SGST (State GST). For inter-state transactions (between different states), IGST (Integrated GST) applies at the full rate.
How do I calculate GST-inclusive price from MRP?
To find the original price from a GST-inclusive MRP: Original Price = MRP ÷ (1 + GST Rate/100). For example, if MRP is ₹1,180 at 18% GST: Original = 1180 ÷ 1.18 = ₹1,000.
Who needs to register for GST?
Businesses with annual turnover exceeding ₹40 Lakh (₹20 Lakh for services, ₹10 Lakh for special category states) must register for GST. E-commerce sellers and inter-state suppliers must register regardless of turnover.
Is GST applicable on gold purchases?
Yes. Gold attracts 3% GST on the value plus making charges. Making charges themselves attract 5% GST. So the effective GST on gold jewelry is approximately 3% on gold value + 5% on making charges.

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What is the GST Calculator?

The GST Calculator helps you add or remove Goods and Services Tax (GST) from any amount. It automatically splits the tax into CGST and SGST (for intra-state transactions) or shows IGST (for inter-state). Whether you are a business owner creating invoices or a consumer verifying prices, this tool covers all GST slabs — 5%, 12%, 18%, and 28%.

How to Use the GST Calculator

  1. Enter Net Amount (Pre-GST): Enter your net amount (pre-gst) in Indian Rupees (₹) in the input field. The calculator will validate your input automatically.
  2. View Your Results: The GST 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 GST 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 financial formulas updated for 2026

Why Use Calc Labz GST Calculator?

The Calc Labz GST 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 financial 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

Principal
The original amount of money borrowed or invested, before any interest is applied.
Interest Rate
The percentage charged on borrowed money or earned on invested money, usually expressed per annum.
Compound Interest
Interest calculated on both the initial principal and previously accumulated interest — "interest on interest."
Amortization
The process of spreading loan repayment into equal installments over a fixed period.
Maturity
The date on which a financial instrument (FD, bond, PPF) reaches its full term and the principal is returned.
CAGR
Compound Annual Growth Rate — the smoothed annual rate of return on an investment over a specified period.

Sources & References

Our GST Calculator uses formulas and guidelines from the following authoritative sources:

  • GST Council — Official Rate Schedule
  • CBIC GST Portal