VAT & GST Calculator

About this calculator

This calculator does both halves of a VAT or GST sum. In "add" mode it takes a net price and shows the tax and the gross (tax-inclusive) total you would charge or pay. In "remove" mode it works backwards from a gross, VAT-inclusive price to recover the net amount and the tax baked inside it. Pick any rate — UK 20%, EU rates, Australian or New Zealand GST, Indian GST slabs — and any currency. Nothing is converted between currencies: the figure you type is the figure that is taxed.

How to read your results

The headline figure is the result of the operation you chose: the gross total when adding tax, or the net price when removing it. The three stats always show the same breakdown — net (before tax), the VAT/GST amount, and the gross (after tax) — so you can read off whichever line you need. When removing VAT, note that the tax is a smaller share of the gross than the rate suggests: 20% VAT is only one-sixth (16.67%) of a tax-inclusive price, because the rate is applied to the net, not the gross.

How it's calculated

Let r be the rate as a fraction (rate / 100). In add mode the input is the net price: VAT = net x r, and gross = net + VAT = net x (1 + r). In remove mode the input is the gross, tax-inclusive price: net = gross / (1 + r), and VAT = gross - net. A zero rate leaves the price unchanged in both directions. All money figures are rounded to two decimal places; the rate and chosen operation are echoed back with the result.

Worked example

Add mode, net price 100, rate 20% (UK standard VAT).

The VAT is 20 and the gross price is 120. Switch to remove mode with a gross of 120 at the same 20% and you get back exactly: net 100, VAT 20.

Frequently asked questions

How do I add VAT to a price?

Choose "add", enter the net (pre-tax) price and the rate. The calculator multiplies the net by the rate to get the VAT, then adds it on: gross = net x (1 + rate / 100). At 20% a net 100 becomes a gross 120.

How do I remove VAT from a gross price?

Choose "remove" and enter the gross (tax-inclusive) price. The net is the gross divided by (1 + rate / 100), and the VAT is the difference. Removing 20% from 120 gives a net of 100 and 20 of VAT — not 24, because the rate applies to the net, not the gross.

Why is the VAT in a gross price less than the headline rate?

Because the rate is charged on the net amount. A 20% rate means the VAT is one-sixth of the gross (16.67%), a 10% GST is one-eleventh (9.09%), and a 5% rate is one-twenty-first (4.76%). The reverse calculation accounts for this automatically.

Which rate should I use for VAT or GST?

Use the rate that applies to your goods or service and country. The UK standard rate is 20% (with a 5% reduced rate and 0% zero rate), Ireland 23%, Germany 19%, Australia and New Zealand charge GST at 10% and 15%, and India uses GST slabs of 5%, 12%, 18% and 28%. Always confirm with the local tax authority.

Does this convert between currencies?

No. The currency selector only labels the result — VAT and GST are charged in the price's own currency, so the engine never converts. Enter the amount in whatever currency it is denominated in.

Sources

• VAT rates — GOV.UK (2011)
• GST - Goods and Services Tax — Australian Taxation Office

Reviewed by the YouCalc Team · Last reviewed June 26, 2026