GST Calculator

Free GST calculator — add or remove GST from any amount at 5%, 18% or 40%, or any rate you type, and see the CGST + SGST and IGST split.

GST Calculator — Calculate GST Inclusive and Exclusive Amounts Instantly

Whether you're a small business owner pricing your products, a freelancer raising an invoice, or a customer verifying a bill, GST math comes up daily. Our GST Calculator handles both directions — add GST to a base price or extract GST from a final amount — at the current GST rates (5%, 18% and 40%) or any special rate you type.

Enter the amount, choose the GST rate, and see the CGST, SGST, IGST, base amount, GST amount, and total instantly. Perfect for invoice creation, bill verification, and tax filing. No signup, no cost.

How to Calculate GST

1. Enter Amount

Type the amount — either the base price (excluding GST) or the final price (including GST).

2. Select GST Rate

Pick 5%, 18% or 40% — the main GST rates since 22 September 2025 — or type another rate, such as 3% for gold.

3. Add or Remove GST

Choose "Add GST" to compute the gross from a base, or "Remove GST" to extract GST from a tax-inclusive amount.

4. View Breakdown

See base amount, GST amount, CGST + SGST split (intra-state), and IGST (inter-state) instantly.

All calculations happen in your browser. Your billing data is never sent to any server.

GST Calculator Features

Current GST Rates

One tap for 5%, 18% or 40%, and an “Other rate” box for special rates such as 3% on gold.

CGST + SGST Split

For intra-state sales, GST is split equally between CGST and SGST. The calculator shows the split automatically.

IGST for Inter-State

For inter-state sales, the calculator shows the full GST as IGST (Integrated GST) instead of CGST + SGST.

Reverse GST

Extract the base price and GST amount from any GST-inclusive total — useful for verifying restaurant or retail bills.

Clear Breakdown

See the net amount, the GST, the total and the CGST + SGST or IGST split together, ready to note on an invoice or to check a bill.

Free and Private

No signup, no tracking. Runs entirely in your browser.

GST Calculator — FAQs

Since 22 September 2025, GST has two main rates: 5% (the merit rate) and 18% (the standard rate), plus a 40% rate for a short list of luxury and sin goods. Some items are exempt (0%), a few have special rates such as 3% on gold, and certain tobacco products kept their old rates for a transition period. Check the rate for your item on the CBIC GST portal.

CGST goes to the Central government and SGST to the State government — both apply on intra-state sales (split equally). IGST applies on inter-state sales and goes to the Central government, which then shares it with the destination state.

Base price = Inclusive amount × 100 / (100 + GST rate). For example, if the inclusive price is ₹1,180 at 18% GST, the base is ₹1,000 and GST is ₹180. The calculator does this automatically in "Remove GST" mode.

Yes, completely free. No signup, no limits.

GST Rate	Applicability
0%	Exempt and nil-rated items, such as many unpacked fresh foods and a range of health and education services.
5%	The merit rate: everyday essentials and many common goods and services.
18%	The standard rate: most goods and services.
40%	A special rate for a short list of luxury and sin goods and services, such as sweetened or aerated drinks, larger cars and betting or casino services.
Other	Special rates such as 3% on gold and 0.25% on rough diamonds; some tobacco products kept their old rates for a transition period. Type these in “Other rate”.

GST Rate Reference

Related calculators