Unit Converter
Convert between length, weight, and temperature units — metric and imperial.
About the Unit Converter
This unit converter handles the three categories of conversion people need most often: length (meters, feet, inches, kilometers, miles, and more), weight (kilograms, pounds, ounces, grams), and temperature (Celsius, Fahrenheit, Kelvin). Pick a category, choose your 'from' and 'to' units, and the result updates instantly as you type.
It's designed for quick everyday conversions — following a recipe written in another country's units, converting your height or weight for a form, or checking a temperature reading — without needing to remember or look up conversion factors.
Worked example
Example: converting temperature, 100°F converts to approximately 37.8°C — useful for reading a US-style thermostat or weather report if you think in Celsius.
Frequently asked questions
- What unit categories does this converter support?
- Length (millimeters to miles), weight/mass (grams to pounds), and temperature (Celsius, Fahrenheit, and Kelvin). Switch categories using the selector above the converter.
- Are the conversions precise?
- Yes, conversions use standard, internationally recognized conversion factors (for example, 1 inch = 2.54 cm exactly) and display results rounded to a reasonable number of decimal places for readability.
- Why is Fahrenheit to Celsius not a simple ratio?
- Celsius and Fahrenheit scales have different zero points as well as different degree sizes, so the formula is °C = (°F − 32) × 5/9 rather than a simple multiplication.
- Can I convert both directions?
- Yes — swap the 'from' and 'to' units at any time, or use the swap button, and the converter recalculates instantly in the reverse direction.