Unit Converter

What this tool does

Instead of bookmarking a different converter for every unit type, this one tool handles six of the most common categories: length, weight/mass, temperature, volume, area, and speed. Pick a category, choose your "from" and "to" units, type a number, and the answer updates as you type.

Who it's for

Cooking a recipe in a different measurement system, converting a recipe from cups to milliliters, checking your weight in kilograms vs pounds, figuring out a temperature in Fahrenheit vs Celsius, or converting speed between mph and km/h for travel — it covers the conversions people actually search for day to day.

How to use it

• Pick a category from the dropdown (length, weight, temperature, volume, area, or speed).
• Choose the unit you're converting from and the unit you want, then type your value — the result appears instantly, no button needed.
• Use the swap button to flip the two units in one click.
• Check the quick reference table below the converter for common conversions of that unit at a glance.

Real-world examples

Converting a US recipe that calls for 2 cups of flour into milliliters for a kitchen scale calibrated in metric? Switch to Volume and convert cups to milliliters instantly. Trying to figure out if 98.6°F is a fever in Celsius? Switch to Temperature. Need to know how many miles a 10 km race actually is? Switch to Length.

Frequently asked questions

How do I convert Celsius to Fahrenheit?

Multiply by 9/5 and add 32: °F = (°C × 9/5) + 32. Select Temperature, pick Celsius as "from" and Fahrenheit as "to", and this tool does the math for you.

How many pounds are in a kilogram?

1 kilogram equals approximately 2.20462 pounds — select Weight/Mass and the quick reference table shows this and every other common weight unit at once.

What's the difference between a US cup and a metric cup?

This tool uses the US customary cup (236.588 mL). Recipes from other countries sometimes use a 250 mL metric cup, so double-check your recipe's origin for precise baking.

Can I convert speed between mph and km/h?

Yes — select the Speed category to convert between miles per hour, kilometers per hour, knots, meters per second, and feet per second.

Does this tool round the results?

Results are shown to six decimal places (or scientific notation for very large or very small numbers) so you get full precision for exact conversions, not just rounded estimates.