PrismKitUnitsSpeed ConverterSpeed ConverterRuns in your browserLocalCopy linkMarkdownExpress a speed in km/h, mph, m/s, ft/s, knots or as a fraction of the speed of light.Volume ConverterConvert litres and cubic units to US and imperial gallons, pints, cups and spoons side by side.Time ConverterBreak a duration down into nanoseconds through years, using average Gregorian months and years.