GST Calculator
Add GST to a price or extract the base price from a GST-inclusive amount.
Total amount
₹1,180
🌍One calculator for tax anywhere
Sales tax goes by many names — GST in India and Australia, VAT in the UK and Europe, sales tax in the US — but the maths is the same. Pick your tax system for the right rate presets, or choose a custom rate for anywhere in the world. You can add tax to a base price or remove it from a tax-inclusive price, and for India it splits GST into CGST and SGST automatically.
🔁Add or remove — both directions
- Add tax — you know the price before tax and want the final amount a customer pays.
- Remove tax (reverse GST/VAT) — you have a tax-inclusive price and need the base value and tax portion, e.g. for accounting.
- India split — intra-state sales show CGST + SGST (half each); tick 'inter-state' to show IGST instead.
🧮The formulas
When adding tax, the tax is a simple percentage of the base price. When removing it, you divide the inclusive price by 1 plus the rate to recover the original base — the difference is the tax that was already included.
💡Good to know
- GST/VAT rates vary by product and country — always confirm the correct slab for your item.
- For India, CGST and SGST each take half the GST on sales within a state; IGST applies across states.
- US sales-tax rates differ by state and city; enter your local combined rate as a custom value.
- Download the branded breakdown as a PDF to attach to a quote or invoice.
💡 Frequently Asked Questions
How do I add GST or VAT to a price?+
Tax = Price × Rate ÷ 100, and the total becomes Price + Tax. For example, ₹1,000 at 18% GST = ₹1,180 total.
How do I remove GST or VAT from an inclusive price?+
Base price = Inclusive price ÷ (1 + Rate/100). For example, ₹1,180 inclusive of 18% GST has a base price of ₹1,000 and ₹180 tax.
What is the difference between CGST, SGST and IGST?+
For sales within a state, GST is split equally into CGST (central) and SGST (state). For sales between states, a single IGST is charged instead, equal to the full GST rate.
Can I use this for VAT or US sales tax?+
Yes. Choose UK VAT, EU VAT, Australia GST, Canada GST/HST, US Sales Tax, or a custom rate — the calculation works for any percentage-based tax anywhere.