The calculation you need, found and done in seconds

Your 2026/27 take-home pay after Income Tax (England, Wales and Northern Ireland or Scotland), employee National Insurance, pension contributions and student loan repayments – yearly, monthly and weekly.

Add VAT to a net price or take it off a gross price at the UK standard 20% rate, the reduced 5% rate or the zero rate – or type any other rate.

Work out what gold is worth in GBP from the live international spot price and exchange rate: 24K, 22K, 18K and 14K, per gram, kilogram or troy ounce, with dealer premium, fees, making charge and VAT as separate lines.

Convert between 31 major currencies, including GBP, at the daily reference rate. The source, publication date and any delay are shown, and you can type your own rate if the lookup fails.

Work out what gold is worth in GBP from the live international spot price and exchange rate: 24K, 22K, 18K and 14K, per gram, kilogram or troy ounce, with dealer premium, fees, making charge and VAT as separate lines.

Convert between 31 major currencies, including GBP, at the daily reference rate. The source, publication date and any delay are shown, and you can type your own rate if the lookup fails.

See how an initial investment plus monthly contributions grows with monthly or yearly compounding, year by year, and how long it takes to double (rule of 72).

Add VAT to a net price or take it off a gross price at the UK standard 20% rate, the reduced 5% rate or the zero rate – or type any other rate.

Your 2026/27 take-home pay after Income Tax (England, Wales and Northern Ireland or Scotland), employee National Insurance, pension contributions and student loan repayments – yearly, monthly and weekly.

Count the days, weeks, months and years between two dates, or add or subtract days, weeks, months or years from a date.

Calculate your body mass index from height and weight in metric or imperial units and see your WHO weight category and the weight range for a BMI of 18.5–24.9.

Find X% of a number, what percentage one number is of another, the percentage change between two values, and a value increased or decreased by a percentage.

Convert length, area, weight, volume, temperature, speed and data units, and see the value in every unit of the same kind in one table.

Encode text to Base64 or decode Base64 back to text (UTF-8), with URL-safe and 76-character line options. Runs entirely in your browser.

Percent-encode text for URLs or decode it back, as a single value (encodeURIComponent) or a whole address (encodeURI), with an option for + as space. Query parameters are listed when decoding.

Generate up to 100 random version 4 UUIDs in your browser, in upper or lower case, with or without hyphens or braces, and check whether a value is a valid UUID.

Pretty-print, minify or validate JSON in your browser. Errors are shown with the exact line and column, and you can sort keys and choose the indentation.