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GST Calculator — Add or Remove GST
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This GST calculator lets you add GST to a base price or remove GST from a GST-inclusive amount in a single step, with the result automatically split into CGST and SGST for reference. It's built for shop owners, freelancers, accountants, and shoppers who need to quickly work out tax-inclusive or tax-exclusive pricing without doing the percentage math by hand. Choose whether your amount already includes GST or not, enter the rate — 5%, 12%, 18%, 28%, or any custom percentage — and the calculator instantly shows the original price, the GST amount, and the final total. Because it runs entirely in your browser, your figures are never uploaded or stored anywhere, and there's no signup or usage limit. Scroll down to enter your amount and GST rate to see the breakdown instantly.
Features
- Add GST to a base price (exclusive mode)
- Remove GST from a GST-inclusive total (inclusive mode)
- Preset rates for 5%, 12%, 18%, 28%, plus custom rate entry
- Automatic CGST / SGST split for reference
- Instant recalculation as you type
- Works for invoices, billing, and everyday tax-inclusive pricing
Why use this gst calculator?
- Instant results with no manual percentage math
- Fully private — amounts are never stored or uploaded
- Covers both common GST directions in one tool
- Simple enough for quick everyday billing checks
- Completely free with unlimited use
Frequently asked questions
How do I calculate GST on an amount?
Multiply the base price by the GST rate divided by 100 to get the GST amount, then add it to the base price for the total. This calculator does that instantly in exclusive mode.
How do I remove GST from a total that already includes it?
Divide the GST-inclusive amount by (1 + GST rate/100) to get the original base price, then subtract that from the total to find the GST amount — use inclusive mode to do this automatically.
What is the difference between CGST and SGST?
For intra-state transactions in India, GST is split equally into CGST (Central GST) and SGST (State GST), each being half of the total GST amount.
What GST rates does this calculator support?
Common preset slabs of 5%, 12%, 18%, and 28% are included, plus you can enter any custom GST or VAT percentage.
Can I use this as a VAT calculator?
Yes, the same add/remove tax logic applies to VAT or any percentage-based sales tax — just enter your local tax rate.
Is this GST calculator accurate for official filings?
It performs the standard GST math correctly, but for official tax filings always verify figures against your accounting software or a tax professional.