Free GST Rate Calculator
Quoted a price and need to know what it looks like with GST added — or handed a GST-inclusive total and need to work out what’s actually taxable? Enter the amount, pick a rate, and this splits it instantly.
Breakdown
For a calculation per line item on a real invoice — with seller, buyer, and HSN/SAC codes — use the free GST invoice generator instead.
Why “Remove GST” Isn’t Just Subtraction
Say a customer paid ₹11,800 for something taxed at 18%. The instinct is to subtract 18% of ₹11,800 — that gives ₹2,124, leaving ₹9,676 as the taxable value. But that’s wrong, because ₹11,800 already includes the tax; 18% of the pre-tax amount is what was actually charged, not 18% of the total. The correct taxable value is ₹11,800 ÷ 1.18 = ₹10,000 exactly, with ₹1,800 as the tax. The two numbers look close enough to pass a quick glance, which is exactly how this mistake ends up on real invoices.
This calculator does the division, not the subtraction, whenever you’re working backward from a GST-inclusive figure.
Frequently Asked Questions
What's the difference between 'add GST' and 'remove GST'?
'Add GST' treats your amount as the pre-tax price and calculates the total after tax. 'Remove GST' treats your amount as a GST-inclusive total — the price a customer actually paid — and works backward to find the taxable value and the tax hidden inside it.
How do I know whether to use CGST+SGST or IGST?
If the seller and buyer are registered in the same state, GST splits into CGST and SGST — half the rate each, one going to the central government and one to the state. If they're in different states, the full rate applies as IGST instead. The total tax is the same either way; only the split differs.
Is this calculator free?
Yes, no signup, no limit on how many calculations you run. It works entirely in your browser.
Can I use a GST rate other than 0%, 5%, 12%, 18%, or 28%?
Yes. Select Custom and enter any rate. This is useful for cess-inclusive effective rates or older rate slabs that no longer appear on the standard list.
Does this generate an invoice?
No, this tool only calculates a single amount. For a full invoice with seller and buyer details, line items, and HSN/SAC codes, use the free GST invoice generator instead.
Doing this calculation on every invoice?
EzNxT Accounting calculates GST automatically on every line item and keeps a GSTR-ready record — free for up to 10 users.
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