Unit Converters - The Most Accurate Unit Conversion
Convert length, weight, volume, area, speed, time, temperature, flow rate and calendar dates. Every conversion is exact to 11 significant digits.
Why these conversions are exact
Most converters do their arithmetic in ordinary floating-point numbers, which cannot represent a value as simple as 0.1 exactly. AZUZAN does not. Every factor on this site is stored as a pair of whole numbers – a mile is exactly 201168⁄125 meters, not an approximation of it – and the arithmetic is done in arbitrary-precision decimal, using a JavaScript port of a library whose lineage runs back through STZ-IDA to IBM.
Values are carried internally with far more precision than is ever shown, so the figure you read has been rounded exactly once, at the end. That matters most at the extremes: a nanometer expressed in kilometers is a millionth of a millionth, and this site shows it as such rather than rounding it away to zero.
The claim is tested rather than asserted. Conversions between all 178 units on the site are checked against exact whole-number ratio arithmetic, so a wrong factor or a lost digit fails a test before it can reach the page you are reading.
What each converter covers
Calendar Converter – 15 units: Gregorian, Ethiopian, Chinese, Hebrew, Hijri, Hijri (Saudi), Japanese, Japanese (Lunisolar), Julian, Korean, Korean (Lunisolar), Persian, Taiwan, Taiwan (Lunisolar), and Thai Buddhist.
Speed Converter – 17 units: Meters per Second, Meters per Hour, Meters per Minute, Miles per Hour, Miles per Minute, Miles per Second, Kilometers per Hour, Kilometers per Minute, Kilometers per Second, Feet per Minute, Feet per Second, Inches per Minute, Inches per Second, Centimeters per Second, Knots, Millimeters per Second, and Yards per Second.
Flow Rate Converter – 40 units: US Gallons per Day, US Gallons per Hour, US Gallons per Minute, US Gallons per Second, US Gallons per Year, UK Gallons per Day, UK Gallons per Hour, UK Gallons per Minute, UK Gallons per Second, UK Gallons per Year, Liters per Day, Liters per Hour, Liters per Minute, Liters per Second, Liters per Year, Cubic Feet per Day, Cubic Feet per Hour, Cubic Feet per Minute, Cubic Feet per Second, Cubic Feet per Year, Cubic Meters per Day, Cubic Meters per Hour, Cubic Meters per Minute, Cubic Meters per Second, Cubic Meters per Year, Oil Barrels per Day, Oil Barrels per Hour, Oil Barrels per Minute, Oil Barrels per Second, Oil Barrels per Year, Acre-Feet per Day, Acre-Feet per Hour, Acre-Feet per Minute, Acre-Feet per Second, Acre-Feet per Year, US Survey Acre-Feet per Day, US Survey Acre-Feet per Hour, US Survey Acre-Feet per Minute, US Survey Acre-Feet per Second, and US Survey Acre-Feet per Year.
Height Converter – 3 units: Meters, Centimeters, and Feet with Inches.
Temperature Converter – 4 units: Celsius, Fahrenheit, Kelvin, and Rankine.
Weight Converter – 17 units: Grams, Pounds, Troy Pounds, Kilograms, Ounces, Troy Ounces, Carats, Milligrams, Metric Tons, Long Tons, Short Tons, Grains, Stones, Slugs, Pennyweights, Drams, and Hundredweight.
Area Converter – 11 units: Square Meters, Acres, US Survey Acres, Hectares, Square Centimeters, Square Feet, Square Inches, Square Kilometers, Square Miles, Square Millimeters, and Square Yards.
Volume Converter – 39 units: Liters, US Gallons, US Dry Gallons, UK Gallons, Milliliters, US Fluid Ounces, UK Fluid Ounces, Oil Barrels, US Dry Barrels, US Beer Barrels, UK Beer Barrels, Cubic Centimeters, Cubic Millimeters, Cubic Feet, Cubic Inches, Cubic Meters, Acre-feet, US Survey Acre-feet, US Pints, US Dry Pints, UK Pints, Metric Cups, US Cups, US Legal Cups, UK Cups, Japanese Cups, Tablespoons, Australian Tablespoons, Teaspoons, US Quarts, US Dry Quarts, UK Quarts, US Bushels, UK Bushels, US Pecks, UK Pecks, Cubic Yards, Cubic Kilometers, and Cubic Miles.
Length Converter – 19 units: Centimeters, Inches, Meters, Kilometers, Miles, US Survey Miles, Nautical Miles, Feet, US Survey Feet, Yards, Millimeters, Micrometers, Nanometers, Mils, Rods, Furlongs, Chains, Fathoms, and Hands.
Time Converter – 13 units: Days, Hours, Minutes, Seconds, Milliseconds, Nanoseconds, Weeks, Months, Quarters, Years, Decades, Centuries, and Millennia.