Length Enter value and units to convert from: Metres Millimetres Centimetres Kilometres Inches Feet Yards Fathoms Statute Miles Nautical Miles Light Second Light Minute Light Hour Light Year ParSec Astronomical Unit Select units to convert to: Metres Millimetres Centimetres Kilometres Inches Feet Yards Fathoms Statute Miles Nautical Miles Light Second Light Minute Light Hour Light Year ParSec Astronomical Unit Velocity Enter value and units to convert from: Metres per Second Kilometre per Hour Feet per Second Feet per Minute Yard per Minute Statute Mile per Hour Knot Speed of Light Select units to convert to: Metres per Second Kilometre per Hour Feet per Second Feet per Minute Yard per Minute Statute Mile per Hour Knot Speed of Light Area Enter value and units to convert from: Square Metres Square Centimetres Square Kilometres Hectare Square Inches Square Feet Square Yards Acre Square Statute Miles Square Nautical Miles Select units to convert to: Square Metres Square Centimetres Square Kilometres Hectare Square Inches Square Feet Square Yards Acre Square Statute Miles Square Nautical Miles Mass Enter value and units to convert from: Kilograms Grams Ounce Pound Short Ton Long Ton Metric Ton Select units to convert to: Kilograms Grams Ounce Pound Short Ton Long Ton Metric Ton Volume Enter value and units to convert from: Litre Millilitres Cubic Metres Cubic Inch Cubic Feet Cubic Yard US Quart US Gallon Imperial Gallon Barrels (Oil) Select units to convert to: Litre Millilitres Cubic Metres Cubic Inch Cubic Feet Cubic Yard US Quart US Gallon Imperial Gallon Barrels (Oil) Pressure Enter value and units to convert from: Millibar bar kPa psi Atmosphere Millimetre of Mercury Inch of Mercury Select units to convert to: Millibar bar kPa psi Atmosphere Millimetre of Mercury Inch of Mercury