Reverse GST Calculator — Remove GST from Any Price
Remove GST from a price
Add GST to a price
This free Reverse GST Calculator works backwards: you enter a price that already includes GST, and it tells you the original price before tax and exactly how much of what you paid was GST. That backwards question — "remove GST from this price" — is what shopkeepers, freelancers, accountants and online sellers actually face every day, when an MRP, a bill total or a marketplace payout is GST-inclusive and the books need the taxable value and the tax amount as separate figures.
The important thing is the method, because the obvious method is wrong. You cannot find the pre-GST price by subtracting 18% from the total: GST was charged on the smaller base price, so 18% of the bigger inclusive price is too much. The correct calculation divides the inclusive price by (1 + rate/100) — ₹1,180 ÷ 1.18 = ₹1,000, with ₹180 of GST inside it. This calculator does that division for you and also splits the tax into CGST and SGST halves for intra-state sales, or shows it as IGST for inter-state sales. A forward Add GST calculator is included below for quoting prices. Everything runs locally in your browser.
How to use
- Enter the GST-inclusive price — the MRP or bill total — in the first card.
- Check the GST rate; it is preset to 18%, and the other slabs are 5%, 12% and 28%.
- Click Remove GST to see the price before tax, the GST amount, and the CGST + SGST split.
- Use the second card when you need the opposite direction: adding GST to a base price.
- Compare the figures with your invoice or GST return working to verify them.
Frequently asked questions
How do I remove GST from a price manually?
Divide the inclusive price by one plus the rate as a decimal. At 18% GST, divide by 1.18; at 5%, divide by 1.05; at 28%, divide by 1.28. So ₹590 including 18% GST is ₹590 ÷ 1.18 = ₹500 before tax, with ₹90 of GST inside it. Never subtract the percentage from the total — that always overstates the tax.
What is the CGST and SGST split?
For a sale inside one state, GST is shared equally between the central government (CGST) and the state government (SGST), so 18% GST appears on invoices as 9% CGST plus 9% SGST. For a sale to another state, the full amount is charged as IGST instead. The tax total is the same either way.
Which GST rate applies to my product?
India uses slabs of 0%, 5%, 12%, 18% and 28%, and the right one depends on the product or service category (its HSN or SAC code). Most services and many manufactured goods sit at 18%. If you are filing returns, confirm the slab for your item rather than assuming.
Can I use this for input tax credit workings?
It gives you the exact net value and tax split inside any inclusive amount, which is the arithmetic input tax credit workings start from. Formal claims still need valid tax invoices and must follow GST rules, so treat this as the calculator, not the filing.