Rates differ by country and product
Many countries use several rates for different goods. Always check the current rate with your tax authority.
GST, VAT & Sales Tax Calculator
Find the tax on any price in one step. Add tax to a net price, or work backwards from a tax-inclusive total to see how much of it is tax. Works for GST, VAT and sales tax at any rate.
- 100% free
- No sign-up
- Runs in your browser
Common rates:
Net amount (excl. tax)0
Tax amount0
Gross amount (incl. tax)0
How to use
How to use the GST / Sales Tax Calculator
- Choose Add tax if your price excludes tax, or Remove tax if it already includes tax.
- Enter the price and, if needed, the quantity.
- Enter the tax rate or tap one of the common rates.
- Read the net, tax and gross amounts, which update instantly.
Private by design. Everything happens in your browser. Nothing you type or upload is sent to our servers, stored or shared.
About this tool
How do you calculate tax-inclusive and tax-exclusive prices?
To add tax, multiply the net price by the tax rate and add the result. At 18%, a net price of 1,000 carries 180 in tax, for a gross price of 1,180.
Removing tax is where people often go wrong. You cannot simply take 18% off 1,180, because the tax was calculated on the smaller net amount. Instead, divide the gross price by 1.18 to get the net price of 1,000. This calculator does both directions correctly, whatever the rate.
Good to know
Things to keep in mind
Know whether prices include tax
Retail prices often include tax, while business-to-business quotes usually do not. Say which on your quotes.
Round at the right point
Tax rules sometimes require rounding per line or per invoice. Follow your local guidance for official documents.
Use the same rate on your invoices
Once you know the rate, add it to our invoice generator so tax is calculated automatically.
FAQ
GST / Sales Tax Calculator FAQs
How do I remove 18% GST from a price?
Divide the price by 1.18. For example, 1,180 divided by 1.18 is 1,000, so the GST included is 180.
Is GST the same as VAT?
They work in a very similar way. Both are taxes on the value of goods and services, and different countries use different names.
Can I use this for sales tax in the US?
Yes. Enter your combined state and local sales tax rate and choose Add tax.
Why does removing tax not equal subtracting the rate?
Because tax is calculated on the net price, not on the gross price. Dividing by one plus the rate gives the correct result.
Does the tool store my numbers?
No. All calculations happen in your browser.
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