Business & Work
Free VAT, GST and Sales Tax Calculator
Add tax to a price, or pull it back out of a price that already includes it - using the right tax name and currency for your country.
Free to useNo sign-up requiredNo watermarkRuns in your browser
Last reviewed: 30 September 2026 by Vishal Senthilkumar
This calculator does the two things people actually need a tax calculator for: adding tax to a price that does not yet include it, and working backwards from a price that already includes tax to find out what the pre-tax amount and the tax itself were.
It follows your country selection at the top of the site, so the label matches what your tax authority actually calls it - VAT, GST or sales tax - and the currency matches too. The rate is always yours to enter, because tax rates change and can vary by product or region, so nothing here assumes a rate on your behalf.
How this tool works
Choose the direction
Adding tax to a net price, or removing tax that is already included in a price you were given, are different calculations - pick the one that matches what you have.
Enter the amount
The price before tax if you are adding tax, or the total price if you are removing it.
Enter the rate
Your country's standard rate, or whatever rate actually applies to what you are selling - reduced rates and exemptions are common and this calculator has no way to know which applies to you.
Read the breakdown
The net amount, the tax amount and the gross (total) amount are all shown, so you can see exactly how the total was built.
How it works
Adding tax multiplies the amount you enter by the rate and adds it on: tax = amount x rate, total = amount + tax.
Removing tax works backwards from a total that already includes it. Dividing the total by (1 + rate) gives the pre-tax amount, and the tax is the difference between the two. This is the calculation most people get wrong by simply subtracting the percentage from the total, which understates the tax.
The tax name shown - VAT, GST or Sales tax - follows the country you have selected at the top of the site, since that is what your invoices and receipts will actually say.
Why you cannot just subtract the percentage
If a $115 price includes 15% tax, the tax is not 15% of $115. It is 15% of the pre-tax amount, which is $100 - so the tax is $15, not $17.25. Subtracting 15% of the total price overstates the tax and understates the pre-tax amount every time. Dividing by (1 + rate) instead of multiplying by the rate is the fix, and it is what this calculator does automatically in "remove tax" mode.
What this calculator deliberately does not do
- It does not assume a rate for your country. Standard rates change over time, and most tax systems also have reduced rates, zero rates and exemptions for specific goods and services.
- It does not know which rate applies to what you are selling. Always check your tax authority's current published rate for your specific product or service before using a number here for filing or invoicing.
- It is not tax advice. It is arithmetic - the two calculations described above, applied to the numbers you give it.
Formula
Add tax
tax = amount x rate, total = amount + tax
Remove tax
pre-tax amount = total / (1 + rate), tax = total - pre-tax amount
Worked examples
Adding 5% VAT to AED 1,000
The tax is AED 50, so the total charged is AED 1,050.
A UK price of £120 that already includes 20% VAT
The pre-tax amount is £100 and the VAT itself is £20 - not £24, which is what subtracting 20% of £120 would wrongly give.
Indian GST at 18% added to ₹2,500
The GST is ₹450, making the total ₹2,950.
Frequently asked questions
What tax rate should I use?
Whatever your tax authority currently publishes as the applicable rate for what you are selling. This calculator intentionally does not assume a rate, since standard rates change over time and many countries also have reduced rates or exemptions for specific categories.
Why does removing tax not just subtract the percentage?
Because the tax was calculated on the pre-tax amount, not on the total. Subtracting the percentage from the total overstates the tax - dividing the total by (1 + rate) gives the correct pre-tax amount.
Does this work for VAT, GST and sales tax?
Yes - the underlying maths is identical for all three. The only difference between them is the name and the rate, both of which vary by country.
How do I change the currency or the tax name shown?
Use the country selector at the top of the site. It sets the currency, the tax name (VAT, GST or Sales tax) and number formatting for every calculator, not just this one.
Is this tax advice?
No. It performs the standard add-tax and remove-tax arithmetic on the numbers you enter. Always confirm the correct rate and treatment for your specific situation with your tax authority or an accountant.
Guides for this tool
VAT-inclusive vs VAT-exclusive price
What "VAT-inclusive" and "VAT-exclusive" actually mean, why the two are easy to confuse, and the correct way to convert between them - wherever in the world VAT, GST or sales tax applies.
How to calculate VAT in the UAE
How to add or remove 5% VAT on a UAE price correctly - including the calculation most people get wrong when working backwards from a VAT-inclusive total - plus a free calculator.