Percentage & VAT Calculator
Percentages, percent change and VAT in one place.
How to use
- 1 Choose the calculation you need from the mode buttons.
- 2 Read the two field labels, which change to match the mode.
- 3 Enter both values.
- 4 Read the result and copy it if needed.
About Percentage & VAT Calculator
The Percentage & VAT Calculator handles the everyday percentage questions that are easy to fumble in your head.
Switch between five modes: find what percentage one number is of another, take a percentage of a value, calculate the percentage change from one figure to the next, add VAT to a net price, or strip VAT back out of a gross price.
These come up constantly — working out a tip, a discount, a markup, a month-on-month growth figure, or the tax line on an invoice.
The VAT modes are especially fiddly because removing tax is not the same as subtracting the rate: take 20% off a £120 gross price and you get £96, but the correct net figure is £100.
This tool applies the proper formulas so adding and then removing VAT round-trips back to where you started.
Pick a mode and the two input labels update to tell you exactly what each box expects, so there is no ambiguity about which number goes where.
Results appear instantly as you type and can be copied with one click.
The maths is a pure client-side function: nothing is sent anywhere, and it keeps working offline.
Whether you are checking a receipt, pricing a product or sanity-checking a spreadsheet, you get a clear, correct answer in seconds.
FAQ
How is "remove VAT" different from subtracting the rate?
Removing VAT divides the gross by (1 + rate/100). A 20% gross of 120 gives a net of 100, not 96, because the tax was charged on the net amount.
Can a percentage change be negative?
Yes. If the second value is lower than the first, the change is shown as a negative percentage.
Does it round the results?
Results are shown at high precision with trailing zeros trimmed; round them yourself to the decimal places your context needs.