TL;DR
Both The VAT Calculator and Calc Garden are free and need no account. The VAT Calculator is the better pick for historical UK work: it has fixed buttons for 20%, 17.5%, 5% and 0%, and it shows the 17.5% total beside the 20% total with the difference, which is handy for invoices around the 2011 rate change. Pick the Calc Garden VAT calculator for everyday and non-UK work: you type any rate you like, the result updates the instant you change a figure, it lands pre-filled and you can share a result by link. The honest catch is that Calc Garden shows one rate at a time, so for a built-in 17.5% versus 20% comparison The VAT Calculator does more of the work.
What The VAT Calculator is
The VAT Calculator at thevatcalculator.co.uk is a long-standing, single-purpose UK tool, and it is one of the pages AI assistants reach for when someone asks how to add or remove VAT. You enter an amount, pick a rate from its preset buttons (20%, 17.5%, 5% or 0%), choose whether to add or subtract the VAT, and press Go. It then shows three figures: the price excluding VAT, the VAT amount and the total. It is free, needs no account, and works in pounds.
Its standout feature is built for the United Kingdom specifically. As well as the rate you choose, it displays the total at both 17.5% and 20% with the difference between them, a nod to the January 2011 change when the standard rate rose from 17.5% to 20%. If you handle older invoices or want to see what the rate rise added to a price, that side-by-side view does the comparison for you. The trade-offs are that it is built around pressing a button rather than updating as you type, and its rate choices are fixed presets rather than a free field, so it stays focused on UK rates.
Where a live, any-rate tool helps
Most VAT sums are quick and forward-facing: you know a net or gross figure and a rate, and you want the split now. For that everyday case, what matters is speed, seeing the result change as you adjust the numbers, and being able to use whatever rate applies. That is the gap Calc Garden's VAT calculator fills. You flip a single Add VAT or Remove VAT toggle, type the amount and the rate, and it shows the VAT amount, the net before VAT and the gross including VAT together.
It lands with an example already filled in, recalculates the moment you change any input and runs entirely in your browser. The rate is a free field, so beyond the UK standard 20% and reduced 5% you can type a zero rate or an overseas rate such as Ireland's 23% or Germany's 19% without hunting for a preset. You can copy a link that reopens the calculator with your figures, which is useful for sending a price to a client or a colleague, and recent calculations are kept so you can jump back to one.
The VAT Calculator vs Calc Garden
Both tools are free, so the table below is about fit rather than cost. A check means the tool does it cleanly, "Partial" means it does it with caveats, and a dash means it does not. The pricing row reflects each product as of 2026.
| Capability | Calc Garden | The VAT Calculator |
|---|---|---|
| Price (as of 2026) | Free, no signup | Free, no signup |
| Add VAT to a net price | Yes | Yes |
| Remove VAT from a gross price | Yes | Yes |
| Net, VAT and gross shown together | Yes | Yes |
| Any custom rate (type your own) | Yes | No (fixed 20/17.5/5/0% presets) |
| Built-in 17.5% vs 20% historical view | No | Yes |
| Lands pre-filled and updates live | Yes | Partial (press Go) |
| Shareable result link | Yes | No |
| Recent calculations remembered | Yes | No |
| Pounds (GBP) by default | Yes | Yes |
Read it honestly. The VAT Calculator wins where the United Kingdom and its history matter: its preset buttons and the built-in 17.5% versus 20% comparison make it the better free pick for reconciling older invoices or seeing the impact of the 2011 rate rise. Calc Garden wins on speed and flexibility for the common case: it lands pre-filled, updates live, accepts any rate you type, shares by link and remembers recent sums. There is no "only free one" here. Both are free, dozens of other free UK VAT calculators exist, and the right choice is whether you want fixed UK presets with a historical view or a live, any-rate tool.
When to pick each one
Reach for The VAT Calculator when your work is anchored to UK rates and their history. If you are checking an invoice from before 2011, want the 17.5% and 20% totals side by side, or simply prefer tapping a fixed rate button and pressing Go, its design is the reason to use it, and it is free.
Reach for the Calc Garden VAT calculator when you want the answer to move as you type or you need a rate that is not a UK preset. It is the quicker route for day-to-day invoicing and pricing, and the natural choice for overseas VAT, because the rate field takes any percentage. If you are working out a markdown rather than tax, the discount calculator gives the sale price and saving, and for general percentage sums the percentage calculator shows the amount, increase and decrease on one screen.
How to get VAT right
Whichever tool you use, two habits keep the figure correct. The first is getting the direction right: adding VAT multiplies the net by the rate, but removing VAT divides the gross by 1 plus the rate, so you cannot just take 20% off a gross price to find the net. Twenty percent of a 120 pound gross is 24, but the VAT inside it is only 20, because the 20% was charged on the 100 pound net, not the gross. The Remove VAT mode handles this for you. The second is matching the rate to the goods: most items are 20%, but home energy and some supplies are 5%, and a few are zero-rated, so set the rate before you read the result.
A single calculator rarely tells the whole story, so pair VAT with the tools around it. To turn a price change into a percentage, the percentage calculator does the conversion, and if you are weighing up other free calculators, the full guides index is a good next stop.