Unit Converter

The Unit Converter tool converts between common units of length, weight, temperature, and more. Conversion runs in your browser, so your values stay private.

Switch between metric and imperial units for recipes, engineering, travel, and study without memorising conversion factors.

Unit conversion is a constant need across cooking, engineering, travel, fitness, and study. A recipe in cups needs converting to millilitres, a running distance in miles needs converting to kilometres, a weight in pounds needs converting to kilograms, and an oven temperature in Fahrenheit needs converting to Celsius. Rather than memorising dozens of conversion factors, you enter a value and read the result instantly.

The tool covers the common unit categories — length, weight, temperature, and more — with precise conversion factors for each pair. Temperature is handled with the correct formulas rather than a simple multiplier, because Celsius, Fahrenheit, and Kelvin do not share a zero point, so a direct ratio would give the wrong answer.

Unit conversion runs entirely in your browser using native JavaScript arithmetic and a built-in table of precise conversion factors. When you enter a value and choose source and target units, the tool multiplies the value by the factor for that unit pair, or applies the correct formula for temperature, and displays the result instantly as you type.

Your values never leave your device — there is no upload, no server-side processing, and no copy retained after you close the tab. The conversion is instant because it operates on the values in memory. The conversion factors are standard and precise, so the results match reference tables exactly.

Temperature uses the correct formulas between Celsius, Fahrenheit, and Kelvin rather than a simple multiplier, because the three scales have different zero points. For related conversions, use the Currency Converter for money, the Timezone Converter for time across regions, and the Percentage Calculator for proportional maths.