VAT and sales tax calculator
Choose whether to add tax, remove included tax, or find the rate. Enter your applicable rate or both net and gross amounts; the calculator performs arithmetic and does not determine tax rules.
● Your numbers stay in this browser.
100 + (100 × 20%)
From question to answer in three moves.
Choose add tax, remove tax, or find tax rate.
Enter a net amount and rate to add tax, a gross amount and rate to remove it, or both amounts to find the rate.
Review the tax amount, net and gross totals, or the calculated tax rate.
The calculation is visible, not a black box.
Enter the applicable rate yourself; the tool does not choose tax rules, exemptions, or invoice rounding. Removing tax at −100% is undefined. Inferring a rate requires a non-zero net amount.
Formula usedtax = net amount × tax rate ÷ 100gross total = net amount + taxnet amount = gross total ÷ (1 + tax rate ÷ 100)tax rate = (gross total ÷ net amount − 1) × 100
Calculation checks updated 27 September 2026: automated tests cover sample inputs and numeric boundaries, not every possible input or commercial rule.
Math without mystery.
How is tax added to a net amount?+
Multiply the net amount by the tax rate to find the tax, then add that tax to the net amount.
Which tax rate should I use?+
Use the rate required for your location and transaction. Tax rules vary, so verify the rate with the relevant authority or a qualified adviser.
Is this tax advice?+
No. This tool only performs arithmetic using the rate you provide.