Unit Converter
Convert between metric and imperial units for length, weight, and temperature. Everything is calculated in your browser, so results appear as you type.
Unit Converter
Quick & Accurate Unit Conversions
Effortlessly convert between different units of measurement. Whether you need to switch between metric and imperial systems for a recipe, a travel plan, or a science project, our tool handles the math for you.
Supported Categories
- Length: Meters, Feet, Inches, Miles, Kilometers, and more.
- Weight: Kilograms, Pounds, Grams, Ounces.
- Temperature: Celsius, Fahrenheit, Kelvin.
How to Use
- Select the category (Length, Weight, or Temperature) from the top tabs.
- Enter the value you want to convert in the input field.
- Choose the "From" and "To" units from the dropdown menus.
- The converted result appears instantly.
Three Dimensional Modeling
Access incredibly precise floating-point architecture ensuring your converted mathematics remain perfectly viable for engineering tolerances.
Distance & Layout
Transition freely down the scale from global Kilometers navigating road trips, all the way into fractional millimeters mapping out carpentry blueprints.
Mass & Weight
Convert metric tons to pounds for shipping weights, or grams to ounces when following a recipe written for a different country.
Thermal Calibration
Quickly cross-reference ambient weather forecasts toggling between Celsius and Fahrenheit. Scientific Kelvin bases are also provided for lab calculations.
Designed For Speed
Culinary Conversions
Attempting to bake a European cake in an American kitchen? Seamlessly map metric flour weights into familiar imperial measurements to avoid wrecking the recipe.
Travel Planning
Make sense of foreign speed limit signs parsing kilometers per hour, or double check your checked luggage weight limit (20kg) to avoid steep airport overweight fees.
24°C
Celsius
75.2°F
Fahrenheit
Frequently Asked Questions
How precise are the conversions?
Calculations run at JavaScript's full 64-bit floating-point precision (roughly 16 significant digits). The displayed result is rounded for readability, but the underlying math doesn't drift.
Why do temperature conversions work differently from other units?
Most conversions are a simple multiplication (1 kg = 2.20462 lb), but Celsius and Fahrenheit have different zero points, so the formula includes an offset: °F = °C × 9/5 + 32. That's why 0°C is 32°F, not 0°F.
What's the difference between a US gallon and an imperial gallon?
A US gallon is about 3.785 liters; an imperial (UK) gallon is about 4.546 liters — a 20% difference. The same split affects pints and fluid ounces, so always check which system a recipe or spec sheet means.
Are these conversions based on official definitions?
Yes — conversion factors follow the international standard (SI) definitions, e.g. 1 inch is exactly 25.4 mm and 1 pound is exactly 0.45359237 kg by definition, not approximation.
Does the converter work offline?
Once the page is loaded, yes — all conversion math runs locally in your browser with no server involved.
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About This Tool
Unit conversion is mostly arithmetic, with a few traps. Temperature is the obvious one: Celsius and Fahrenheit have different zero points, so converting means offsetting as well as scaling. Weight and mass are casually interchanged in everyday use. And US and imperial gallons are different volumes despite the shared name.
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