GST Calculator
Free GST calculator for India: add or remove GST with the current 5%, 18% and 40% slabs, precious-metal rates, reverse calculation, and CGST/SGST/IGST split. Instant and private.
Runs 100% on your device - nothing you enter or upload leaves your browser.
How to use the GST calculator
Enter an amount, pick the GST slab, and choose whether your amount includes GST or not. The tax amount, final price and the CGST/SGST split appear instantly.
Add vs remove
- Add GST when you have a base price and want the invoice total.
- Remove GST (reverse calculation) when a price tag already includes GST and you want the base price and tax component.
Privacy
Amounts never leave this page. All calculations happen on your device.
Frequently asked questions
How do I add GST to a price?
Multiply the base price by the GST rate divided by 100. GST on ₹10,000 at 18% is ₹1,800, making the total ₹11,800.
How do I remove GST from an inclusive price?
Divide the inclusive price by (1 + rate/100), then subtract. The GST inside ₹11,800 at 18% is ₹1,800.
What is the CGST/SGST split?
For sales within one state, GST splits equally into CGST (central) and SGST (state). For inter-state sales, the full amount is IGST. The tax total is the same either way.
Are the 2025 GST slab changes included?
Yes. Since 22 September 2025 GST uses a two-slab structure: a 5% merit rate and an 18% standard rate, plus a 40% de-merit rate for select goods like tobacco and aerated drinks, and special rates of 0.25% and 3% for precious stones and metals. The old 12% and 28% slabs were withdrawn for most items. Rates are set by the GST Council; verify the current rate for your product category before invoicing.
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