FilesCalcs

Calculators

Quick answers for the sums that come up in work and everyday life: adding or removing VAT at UK rates, percentage changes, pricing for a target margin and more. Every calculator updates as you type and accepts numbers the way you write them, including "£1,200" and "1.2k".

Nothing you type is sent anywhere. The sums are worked out in your browser.

VAT calculatorAdd or remove UK VAT at 20%, 5% or 0%Reverse VAT calculatorFind the price before VAT from a totalPercentage calculatorX% of a number, or what % one number is of anotherPercentage increase calculatorIncrease or decrease a number by a percentagePercentage change calculatorThe percentage change between two numbersMargin calculatorMargin, markup and profit from cost and priceMarkup calculatorSelling price from cost and markupProfit margin calculatorProfit margin with or without VAT in the priceDiscount calculatorSale price after a percentage offInvoice generatorA UK invoice with VAT, ready as a PDFMB to KB converterConvert between bytes, KB, MB and GB

Which tool do I need?

Adding or removing VAT

Use the VAT calculator to add 20% to a price, or the reverse VAT calculator to take it off a total. To remove VAT, divide by 1.2: £120 including VAT is £100 plus £20 VAT. Multiplying by 0.8 gives £96, which is wrong.

Pricing a product

The margin calculator tells you what share of the selling price is profit. The markup calculator works from cost. A 50% markup on a £10 cost gives a £15 price, which is a 33% margin. If you are VAT registered, the profit margin calculator removes VAT first so your margin is not flattered.

Percentages at work and at home

Pay rises, price changes and discounts are all percentage sums. The percentage change calculator always divides by the starting value, and the discount calculator shows what a double discount really comes to.

Sending an invoice

The invoice generator builds a UK invoice with VAT by rate, bank details and a due date, then saves it as a PDF. Your business details stay in your browser for next time.

Questions people ask

Are these calculators up to date with UK VAT rates?

Yes. They use the standard 20%, reduced 5% and zero 0% rates, and you can enter a custom rate for anything else.

Do you store the numbers I type?

No. Every sum is worked out in your browser and nothing is sent to us.

Can I copy the answer?

Yes. Every result has a copy button, and figures are formatted in pounds and pence ready to paste.