Unit Converter

A recipe in a US cookbook lists ounces while your kitchen scale reads grams, or a product spec sheet gives dimensions in inches when you're used to thinking in centimeters — unit mismatches come up constantly. This tool converts between common length, weight, and temperature units instantly.

What's covered in each category

Length covers meters, kilometers, centimeters, millimeters, miles, yards, feet, and inches. Weight covers kilograms, grams, milligrams, pounds, ounces, and tonnes. Temperature covers Celsius, Fahrenheit, and Kelvin, using the correct non-linear conversion formulas (temperature scales don't convert with a simple multiplication factor the way length and weight do, since they have different zero points).

Everyday situations this covers

Converting a recipe's ingredient weights between grams and ounces when cooking from an international cookbook. Checking a US clothing or shoe size chart given in inches against a metric measurement. Converting a weather forecast's Fahrenheit temperature to Celsius when traveling between countries that use different scales. Converting a product's listed weight in pounds to kilograms for an international shipping form.

Frequently Asked Questions

Why does the temperature category work differently from length and weight? Celsius, Fahrenheit, and Kelvin each start counting from a different zero point, so converting between them requires an offset calculation (like subtracting 32 and multiplying by 5/9 for Fahrenheit to Celsius), not just a multiplication factor like length and weight units use.

How precise are the conversions? Results are shown to four decimal places and use standard internationally recognized conversion factors, accurate enough for everyday, cooking, and general reference use.

Is my data saved anywhere? No — the conversion runs entirely in your browser using JavaScript; nothing is stored or transmitted.