Unit Converter
Choose a category (length, weight, volume, or temperature), pick a "from" and "to" unit, and enter a value to convert it instantly, with the formula shown for temperature conversions.
How It Works
Length, weight, and volume conversions work by converting the input value to a common base unit (meters, grams, or milliliters), then converting that base value to the target unit. Temperature conversions use dedicated formulas since Celsius, Fahrenheit, and Kelvin do not share a common zero point.
Worked Example
To convert 10 miles to kilometers: 10 miles times 1609.344 (meters per mile) equals 16,093.44 meters, and 16,093.44 meters divided by 1,000 (meters per kilometer) equals 16.09344 kilometers.
To convert 100 degrees Celsius to Fahrenheit: 100 times 9/5 equals 180, plus 32 equals 212 degrees Fahrenheit, the boiling point of water at sea level.
Frequently Asked Questions
What units does this converter support?
Length (millimeters, centimeters, meters, kilometers, inches, feet, yards, miles), weight (milligrams, grams, kilograms, ounces, pounds, stone, metric tons), volume (milliliters, liters, teaspoons, tablespoons, cups, US fluid ounces, pints, quarts, US gallons), and temperature (Celsius, Fahrenheit, Kelvin).
How are temperature conversions different from the other categories?
Length, weight, and volume conversions multiply a value by a fixed ratio. Temperature scales have different starting points (zero points), so converting requires addition and multiplication, not just a single ratio.
What is the formula for Celsius to Fahrenheit?
Fahrenheit equals Celsius times 9/5, plus 32.
What is the formula for Celsius to Kelvin?
Kelvin equals Celsius plus 273.15. Kelvin has no negative values since it starts at absolute zero.
Are the volume units US or metric measurements?
Cups, tablespoons, teaspoons, fluid ounces, pints, quarts, and gallons here use US customary measurements, since those are the most commonly searched. Milliliters and liters are metric and are unaffected by this.