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GST Calculator

Add GST to a price or pull it back out of a tax-inclusive total, with the CGST and SGST split worked out to the paisa.

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How to use GST Calculator — Add or Remove GST Online

  1. 1Enter the amount and pick the GST rate.
  2. 2Choose whether the amount already includes GST or the tax should be added on top.
  3. 3Read the result, and the year-by-year table underneath.

About GST Calculator

Two GST questions come up far more than any others, and they are not the same question. Adding GST is easy: 18% on ₹10,000 is ₹1,800, total ₹11,800. Extracting GST from a total that already contains it is where people slip, because the percentage was applied to the smaller number. The taxable value of a ₹1,180 inclusive amount at 18% is ₹1,000, not the ₹967.60 you get by subtracting 18% from ₹1,180. The add/remove toggle here makes which direction you are working in explicit, so the wrong operation is harder to reach for.

The split matters for the invoice rather than the total. An intrastate supply carries half the rate as CGST and half as SGST or UTGST; an interstate supply carries the whole rate as IGST. The tax collected is the same in both cases, which is why the calculator shows them side by side rather than making you choose first. Where the tax works out to an odd number of paise, an exactly equal split is impossible, so the halves are computed in paise and the spare unit is assigned rather than dropped — otherwise the two lines would not reconcile with the tax total on the invoice.

The rates themselves have changed more than once since 2017, which is why the presets separate the slabs in force today from the 12 and 28 percent rates you will still meet on older paperwork. The calculator deliberately stops at the arithmetic: it will not tell you which slab your goods sit in, will not add compensation cess, and knows nothing about reverse charge, input credit or return filing. Check the rate against the current notification or with your accountant, then use this to get the numbers on the invoice right to the paisa.

Frequently asked questions

Which GST rates does the calculator offer?
The preset buttons are 0, 5, 18 and 40 percent, the slabs currently in force, with 12 and 28 offered separately as legacy rates so you can still check an older invoice. You can also type any rate, including fractional ones. Which slab a particular product or service falls into is a classification question tied to its HSN or SAC code — the calculator applies the rate you choose and cannot decide that for you.
How do I remove GST from a total?
Divide, do not subtract. The taxable value is amount × 100 / (100 + rate), so ₹1,180 including 18% GST is ₹1,000 plus ₹180 of tax. Subtracting 18% of ₹1,180 instead gives ₹967.60, which is wrong by ₹32.40 — one of the most common mistakes in invoice arithmetic, and it grows with the rate.
What is the difference between CGST, SGST and IGST?
When buyer and seller are in the same state the tax is split into two equal halves — CGST to the centre and SGST (or UTGST) to the state — so 18% on ₹10,000 is ₹900 plus ₹900. When the supply crosses a state border the whole rate is charged as a single IGST line, ₹1,800 in the same example. The total tax is identical either way; only the heads on the invoice change.
Why do CGST and SGST sometimes differ by one paisa?
Because an odd number of paise cannot be halved. Tax of ₹61.728 on ₹1,234.56 at 5% rounds to ₹61.73, which splits as ₹30.86 and ₹30.87. The calculator does the split in paise so the two halves always add back to the tax exactly, and puts the spare paisa under SGST rather than quietly leaving the invoice a paisa short.
Does it handle compensation cess or reverse charge?
No. Compensation cess on items like tobacco and certain vehicles is levied on top of GST at its own rate and is not included, and reverse-charge supplies, TCS and TDS under GST are outside what this tool does. It is a rate calculator, not a return-filing tool.
Can I use it for VAT or sales tax outside India?
Yes, for the part that is just arithmetic. Pick your currency, type your rate, and the add-tax and remove-tax figures are correct for any single-rate VAT or sales tax. The CGST/SGST/IGST panel is specific to India and can simply be ignored elsewhere.