GST Calculator
Add GST to a price or remove it from a GST-inclusive amount, at any Indian rate.
100% private — every calculation runs in your browser and nothing is stored.
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The GST Calculator works out Goods and Services Tax both ways. Add GST to a base price to get the final amount, or remove GST from an inclusive price to find the base and tax. It supports the standard Indian slabs — 5%, 12%, 18% and 28% — or a custom rate.
Why use this calculator
Add or remove GST
Go from base price to inclusive, or back from inclusive to base.
All Indian slabs
One tap for 5%, 12%, 18% or 28% — plus a custom rate.
CGST / SGST split
See the tax split into CGST and SGST halves.
How to use it
Enter the amount
A base price to add GST to, or an inclusive price to break down.
Pick the GST rate
Choose a standard slab or type a custom percentage.
See the breakdown
Base, GST amount, CGST/SGST and total appear instantly.
Frequently asked questions
How do I add GST to a price?+
Multiply the base price by (1 + rate/100). For example, ₹1,000 at 18% GST becomes ₹1,180. The calculator does this and shows the ₹180 tax separately.
How do I remove GST from an inclusive price?+
Divide the inclusive price by (1 + rate/100) to get the base. For ₹1,180 at 18%, the base is ₹1,000 and the GST is ₹180. Select 'remove GST' to do this automatically.
What are CGST and SGST?+
For intra-state sales, GST is split equally into Central GST (CGST) and State GST (SGST). At 18%, that's 9% CGST + 9% SGST. The calculator shows this split.
Is my data saved?+
No. Everything is calculated in your browser and nothing is stored.