GST Calculator — Add or Remove GST, CGST/SGST and IGST
Add GST to a price or take it out of a GST-inclusive amount, with the CGST/SGST or IGST split. Free, no sign-up, and your files never leave your device.
Free, with no sign-up and no watermark. The file is processed in your browser and never uploaded.
Add GST to a price, or take GST out of an amount that already includes it. Choose the rate and whether the supply is within your state (split into CGST and SGST/UTGST) or to another state (IGST). Results update as you type.
Step by step
- Enter the amount: Type the price in rupees.
- Say whether it includes GST: Choose Before GST (add GST) or GST-inclusive (remove GST).
- Pick the rate: Tap a rate or type a custom one.
- Choose the supply type: Within state shows CGST and SGST; Other state shows IGST.
Handy for
Quoting prices
Find the final price including GST.
Checking bills
See how much of a GST-inclusive bill is tax.
Invoices
Get the CGST/SGST or IGST amounts for a GST invoice.
Purchases
Work out input tax on a purchase.
Good to know
GST slabs were restructured in September 2025 — check the current rate for your item's HSN/SAC code before relying on a slab.
Questions
How do I remove GST from a price?
Divide by (1 + rate). For 18%: ₹1,180 ÷ 1.18 = ₹1,000 before GST, and ₹180 is GST.
Is this tax advice?
No — it's arithmetic. Your accountant or the GST portal decides the applicable rate.
Are my photos or numbers uploaded anywhere?
No. Everything is processed by JavaScript in your browser tab — photos, signatures and the figures you type never leave your device.
Further reading
- How to Make a GST Invoice: CGST + SGST or IGST? — Make a GST invoice with the right CGST + SGST or IGST split, required fields, HSN/SAC codes, round-off and amount in words, with a two-rate worked example.
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