GST Calculator
Add GST to a base price, or find the base price and GST hidden inside a tax-inclusive amount — for any Indian GST slab.
Base amount
Total amount
For an intra-state supply, this GST amount usually splits evenly into CGST and SGST . An inter-state supply instead charges the full amount as IGST.
This runs entirely in your browser.
What is the GST Calculator?
This GST calculator works both ways: give it a price before tax and it adds GST on top, or give it a price that already includes GST and it works out the original base price and the tax hidden inside it. Use it to calculate GST on an invoice, work out how much GST you're paying on a purchase, or reverse-calculate GST from an MRP. It covers every standard Indian GST slab (0%, 0.25%, 3%, 5%, 12%, 18%, 28%) plus a custom rate, with an automatic CGST/SGST split for intra-state billing.
How to use the GST Calculator
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1
Choose Add GST if your amount excludes tax, or Remove GST if it already includes tax.
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2
Enter the amount and pick the applicable GST rate, or choose Custom to enter your own.
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3
Read the base amount, GST amount, and total instantly as you type.
Common questions
How do I calculate GST on an amount?
Enter the base price and select Add GST — the calculator applies your chosen rate and shows the GST amount and the final tax-inclusive total instantly.
How do I remove GST from a total price?
Select Remove GST and enter the tax-inclusive amount — the calculator works backward to show the original base price and how much of the total was GST.
Does this show the CGST/SGST split?
Yes — for intra-state supply the GST amount is shown split 50/50 as CGST and SGST. Inter-state supply uses IGST at the full rate instead.
Which GST rate should I use — 5%, 12%, 18%, or 28%?
Use the rate that applies to your specific goods or service under Indian GST law — check the applicable slab for your HSN/SAC code if you are unsure, or enter a custom rate if yours isn't one of the standard ones.
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