VAT Calculator
VAT Calculator works out Net amount (excluding VAT) and VAT from Amount, VAT rate and Direction. The default figures on this page give gross amount (including VAT) of 120.00; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
3 steps
- Net amount = 100
- VAT = amount x rate / 100 = 100 x 20 / 100 = 20
- Gross = amount + VAT = 100 + 20 = 120
Its 5 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
2 sources
Keep this result
Save it, change one figure, then compare the two
The calculation stays free. Save this scenario, adjust one assumption, save that too, and put them side by side to see exactly what the change costs you. A free account keeps 5 scenarios and 2 comparisons; Personal makes both unlimited and adds exports and private links. Nothing is saved unless you press Save.
What the VAT Calculator calculates
Adds value added tax to a VAT-exclusive amount or extracts the VAT already contained in a VAT-inclusive amount, showing the net, the VAT and the gross for any rate and quantity.
How to use this VAT Calculator
Enter Amount, VAT rate, Direction and Quantity. Net amount (excluding VAT) updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Net amount (excluding VAT), VAT and Gross amount (including VAT).
The method follows Council Directive 2006/112/EC on the common system of value added tax, Title VII (taxable amount) and HM Revenue & Customs, VAT rates: standard 20%, reduced 5%, zero 0%.
Add 20% VAT to 100.00 example
With Amount: 100, VAT rate: 20, Direction: add, the calculator returns VAT: 20, Gross amount (including VAT): 120, Net amount (excluding VAT): 100. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Net amount (excluding VAT), VAT and Gross amount (including VAT). The inputs you can vary are Amount, VAT rate, Direction and Quantity.
Understanding Net amount (excluding VAT), VAT and Gross amount (including VAT)
Indicative VAT arithmetic only. The rate, the place of supply and any exemption, margin scheme or reverse-charge treatment must be confirmed against the rules of the relevant tax authority.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How to calculate VAT tax?
Adds value added tax to a VAT-exclusive amount or extracts the VAT already contained in a VAT-inclusive amount, showing the net, the VAT and the gross for any rate and quantity. Open “How this is worked out” beside the result to see each step for your own figures.
What is a VAT tax rate?
Adds value added tax to a VAT-exclusive amount or extracts the VAT already contained in a VAT-inclusive amount, showing the net, the VAT and the gross for any rate and quantity. On this page it is computed from Amount, VAT rate and Direction and shown as Net amount (excluding VAT), VAT and Gross amount (including VAT).
What is a 10% VAT?
It needs Amount, VAT rate, Direction and Quantity. Nothing else is required, and the figures stay in your browser.
How much VAT refund do you get back?
On the figures this page opens with — amount 100 and VAT rate 20% — the gross amount (including VAT) is 120. No single number fits everyone: change any figure above and the answer updates as you type, with each step of the arithmetic beside it.
What information do I need for the VAT Calculator?
You need Amount, VAT rate, Direction and Quantity. The page opens with default figures that give gross amount (including VAT) of 120.00, so you can see the scale before entering your own.
What does this VAT Calculator show?
It shows Net amount (excluding VAT), VAT, Gross amount (including VAT), Rate applied, VAT as a share of the gross, Line amount before VAT treatment and Direction, with the working and any warnings for your entries.