Financial Instruments

GST Calculator

Calculate GST-inclusive or GST-exclusive price. Supports all Indian GST rates — 5%, 12%, 18%, and 28%. Shows CGST and SGST breakup.

✓ Runs in your browser · Updated 2026-03-30
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Enter values and click Calculate GST to see results

Calculate GST-inclusive or GST-exclusive price. Supports all Indian GST rates — 5%, 12%, 18%, and 28%. Shows CGST and SGST breakup.

Updated: 2026-03-30

GST Formulas

GST-Exclusive (add tax):

GST Amount = Base Price × GST Rate / 100

Total Price = Base Price + GST Amount

GST-Inclusive (extract tax):

Base Price = Total Price / (1 + GST Rate / 100)

GST Amount = Total Price − Base Price

Common GST Rates: 5%, 12%, 18%, 28%

How to Use the GST Calculator

Enter the amount, select the GST rate (5%, 12%, 18%, or 28%), and choose whether you want to add GST to a base price or extract GST from a total price. Click Calculate for an instant breakup including CGST and SGST components.

What is GST?

GST (Goods and Services Tax) is a comprehensive indirect tax levied on the supply of goods and services in India. Introduced on 1 July 2017, it replaced multiple cascading taxes like VAT, service tax, and excise duty. GST is split equally into CGST (Central GST) and SGST (State GST) for intra-state transactions, or charged as IGST for inter-state transactions.

GST Calculation Formulas

Add GST (Exclusive): GST Amount = Base Price × GST Rate / 100 Total Price = Base Price + GST Amount Remove GST (Inclusive): Base Price = Total Price × 100 / (100 + GST Rate) GST Amount = Total Price − Base Price CGST = SGST = GST Amount / 2

GST Rate Slab Guide

  • 5% GST: Essential items — packaged food, footwear under ₹1,000, transport
  • 12% GST: Processed food, business class air tickets, smartphones
  • 18% GST: Most goods and services — electronics, IT services, restaurants (non-AC)
  • 28% GST: Luxury items — cars, AC restaurants, cement, tobacco

Why Businesses Need This

Small businesses, freelancers, and professionals registered under GST need to calculate tax components for every invoice. This tool gives you the exact CGST/SGST split needed for GST invoicing. For inter-state transactions, the total GST amount shown is your IGST amount.

Frequently Asked Questions

What are the GST slab rates in India?

India has four GST slabs: 5% (essential goods), 12% (standard goods), 18% (most services and goods), and 28% (luxury and sin goods). Some items are GST-exempt (0%).