GST / VAT / Sales Tax Calculator

Add tax to a price, or strip it out of a tax-inclusive total.

Total including tax
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Net (before tax)
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Tax amount
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Gross (after tax)
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CGST + SGST (half each)
Net vs tax
Tax rates and rules change and vary by jurisdiction and product. Confirm the correct rate before issuing an invoice or filing a return.
How this works
Add tax: Gross = Net × (1 + Rate ÷ 100) Remove tax: Net = Gross ÷ (1 + Rate ÷ 100)
CountryTaxStandard rate
IndiaGST18% — also 0, 5, 12, 28
United KingdomVAT20%
AustraliaGST10%
New ZealandGST15%
SingaporeGST9%
CanadaGST/HST5% federal
United StatesSales tax0–11%, set locally
  • Reverse GST: 1,180 ÷ 1.18 = 1,000 net. Subtracting 18% gives 967.60 — wrong.
  • India, within one state: CGST + SGST, half each. Between states: IGST in full.
  • US sales tax is quoted excluding tax; VAT/GST prices normally include it.

Currency

  • Amounts follow the currency selected above.
How do I calculate GST on an amount?

Multiply the net amount by the rate as a decimal. At 18%, ₹1,000 attracts ₹180 of GST, making the total ₹1,180.

How do I remove GST from a total that already includes it?

Divide the inclusive total by 1 plus the rate. ₹1,180 ÷ 1.18 = ₹1,000 net, so the GST portion is ₹180. Never subtract the percentage directly.

What is the difference between CGST, SGST and IGST?

For sales inside one state, GST is split half to the centre (CGST) and half to the state (SGST). For interstate sales the full amount is charged as IGST. The customer pays the same total either way.

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