Convert Length, Weight, Temperature, and Volume Instantly
Pick a category, choose your units, and type a number — the result updates instantly in both directions. Centimeters to inches, kilograms to pounds, Celsius to Fahrenheit, milliliters to cups — all the everyday conversions in one simple tool.
📐 Great For
- Converting recipe measurements between metric and US units
- Checking your height or a package size in inches or centimeters
- Converting body weight between kilograms and pounds
- Converting a weather forecast between Celsius and Fahrenheit
- Converting travel distances between kilometers and miles
📋 How to Use
- Pick a category: Length, Weight, Temperature, or Volume
- Choose the units you're converting from and to
- Type a number in either box — the other updates instantly
- Use the swap button to flip the two units
- Press "Copy result" to copy the conversion as text
Frequently Asked Questions
How accurate are the conversions?
All conversions use exact international standard definitions (for example, 1 inch = 0.0254 meters exactly), so results are precise to 6 decimal places, not rough estimates.
Which cup, pint, and gallon does this use?
Volume conversions use US customary units: 1 cup = 236.588 ml, 1 pint = 473.176 ml, 1 gallon = 3785.412 ml.
Can I type a number in either box?
Yes. Typing in either field instantly recalculates the other, so you can convert in whichever direction you need.
Does it remember my last conversion?
Yes. Your last category and unit selection are saved in your browser, so they are restored automatically the next time you visit.