Converters

Fast converters: length, weight, volume, area and speed units, temperature, colors and image pixel measurements.

Calculate how many pixels you need for a final size in cm or inches at any PPI/DPI, with aspect ratio checks for photo printing.

Convert image pixels to cm, mm or inches using PPI/DPI. Select an image locally to read dimensions without uploading it.

Convert temperatures between Celsius, Fahrenheit and Kelvin instantly.

Convert colors between HEX, RGB and HSL instantly with a live picker.

Length converter (cm, m, inches, feet, miles). online converter.

Weight converter (kg, g, pounds, ounces, stone). online converter.

Volume converter (litres, mL, gallons, cups, pints). online converter.

Speed converter (km/h, mph, m/s, knots). online converter.

Area converter (m², ft², acres, hectares). online converter.

Work out the aspect ratio (16:9, 4:3…) from a width and height in pixels. Instantly.

Convert energy between joules, kilojoules, calories, kilocalories, watt-hours, kWh and BTU. Instantly.

Work out DPI/PPI from pixels and physical size, and check whether the resolution is good enough to print.

Work out the new width or height while keeping the image’s aspect ratio, plus the scale in %. Instantly.

Tools — Converters