Calculators Tools

Unit Converter — Length, Weight, Area, Volume and Speed

Convert between metric and imperial units online — length, weight, area, volume and speed — with exact conversion fac...

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Length Converter

Convert length and distance units online — metres, centimetres, millimetres, inches, feet, yards and miles — with hig...

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Weight Converter

Convert kilograms, grams, pounds, ounces, stones and tonnes online using the exact international avoirdupois definiti...

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Temperature Converter — Celsius to Fahrenheit

Convert temperature between Celsius, Fahrenheit and Kelvin online, including the negative and decimal ranges most qui...

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Speed Converter

Convert speed units online between km/h, mph, metres per second and knots, with the exact definitions behind each fac...

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Area Converter

Convert area between square metres, hectares, acres, square feet and square miles online for land, flooring and garde...

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Volume Converter

Convert litres, millilitres, gallons, pints, quarts and fluid ounces online, with US and imperial gallons kept delibe...

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File Size Converter — Bytes, KB, MB, GB, TB

Convert digital storage between bytes, KB, KiB, MB, MiB, GB, GiB and TB online, showing both decimal and binary conve...

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Bytes to KB

Convert bytes to kilobytes online in both the 1000-based and 1024-based definitions, with the exact quotient shown.

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MB to GB

Convert megabytes to gigabytes online for both decimal and binary units, with the division shown so the rounding is v...

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Pixels to Inches

Convert pixels to inches online using the DPI you print or display at, with width and height calculated together.

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Inches to Pixels

Convert inches to pixels online at any DPI, including common print sizes in both width and height.

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CM to Pixels

Convert centimetres to pixels online at your chosen DPI, with the metric print sizes most designers actually work in.

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MM to Pixels

Convert millimetres to pixels online at any DPI — useful for card, stamp and label sizes quoted in mm.

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Percentage Calculator

Calculate percentages online three ways — percentage of a number, what percent one number is of another, and increase...

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Percentage Increase Calculator

Work out the percentage increase or decrease between two numbers online, with the absolute change and the formula shown.

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Age Calculator

Calculate exact age from a date of birth in years, months and days, plus total days lived and the countdown to the ne...

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Date Difference Calculator

Find the number of days, weeks and months between two dates online, with weekdays and weekend days counted separately.

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Days Between Dates

Count the days between two dates online, with the option to include or exclude the end date and a breakdown by weeks.

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Time Calculator — Add and Subtract Hours

Add or subtract times online in hours, minutes and seconds, with the total also given in decimal hours and raw seconds.

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DPI Calculator

Calculate the effective DPI of an image from its pixel size and the print dimensions you want, and see whether it is ...

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Image Aspect Ratio Calculator

Work out the aspect ratio of any image or screen from width and height, with matching standard ratios and the size ne...

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Resolution Calculator

Calculate image resolution in megapixels, total pixels and megabytes of uncompressed RAM from the width and height.

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