The vat works like this: it adds or removes VAT/GST/sales tax at any rate, correctly handling the remove case (divide, not multiply). Everything happens on your device - the input never leaves your tab unless the tool clearly states it performs a server-side lookup.
How to use the VAT Calculator
Enter the amounts, rates or periods involved.
Check the compounding or tax assumptions shown beside each field.
Read the full breakdown, not just the headline number.
Vary one input to stress-test the plan.
Features
Calculate VAT, sales tax, add or remove VAT
Instant result, no page reload
Works in any modern browser, desktop or mobile
Free with no signup
Common mistakes to avoid
Mixing monthly and annual figures in one calculation
Forgetting taxes and fees that sit outside the model
Examples
Input
Result
Gross 118,000 at 18% VAT
Net 100,000 · VAT 18,000 - removal divides by 1.18
Best used for
Getting a reliable answer for vat without installing an app
One-off tasks done in under a minute from any device
Checking results before committing them to something important
Working on a phone where desktop software is unavailable
Privacy
Calculations run in your browser; enter figures only you can see.
Frequently asked questions
Why does "remove 18%" not equal ×0.82?
The gross already includes VAT: net = gross / 1.18. Multiplying by 0.82 double-discounts.
How does removing VAT differ from adding it?
Removing divides (a 100 gross at 20% VAT hides 83.33 net), adding multiplies - the tool keeps both directions correct so receipts can be reconstructed either way.
Which VAT rates does it handle?
Any rate you enter - 5%, 20%, 25% - because jurisdictions differ; the math is the same at every rate.