Unit Converter — Length, Weight, Temperature & More Free

Metric to imperial, Celsius to Fahrenheit, kilograms to pounds — unit conversions come up constantly in daily life, cooking, travel, science, and engineering. Our all-in-one Unit Converter handles every common unit type with instant, accurate results.

What Is a Unit Converter?

A unit converter translates a measurement from one unit to another within the same category. It covers length (meters, feet, inches), weight (kilograms, pounds, ounces), temperature (Celsius, Fahrenheit, Kelvin), volume (liters, gallons, cups), speed (km/h, mph), and more.

How to Use Our Unit Converter

1. Select the measurement category: length, weight, temperature, volume, area, speed, or data.
2. Choose the source unit and enter the value.
3. Select the target unit.
4. The converted value appears instantly. The conversion formula is shown for reference.

Why Use an Online Unit Converter?

• All categories in one place: Length, weight, temperature, volume, area, speed, data storage, and time — no need for separate tools.
• Accurate formulas: No risk of using the wrong conversion factor or making a math error.
• International support: Convert between metric and imperial units seamlessly — essential for international collaboration.
• Instant results: The conversion updates as you type, with no button clicks or page reloads needed.

Common Use Cases

International travelers convert temperatures (is 22°C warm enough for shorts?), distances (how far is 150 km in miles?), and weights (how much is 500 grams in ounces?) constantly. Having a quick converter on your phone eliminates confusion.

Home cooks following recipes from other countries convert between cups and milliliters, ounces and grams, and Fahrenheit and Celsius oven temperatures.

Engineers and scientists convert between SI and imperial units when working with international teams, specifications from different countries, or legacy systems that use non-standard units.

Tips and Best Practices

• Memorize a few anchor points: 0°C = 32°F, 100°C = 212°F, 1 inch = 2.54 cm, 1 kg = 2.2 lbs, 1 mile = 1.6 km. These help with quick mental estimates.
• For cooking, note that volume conversions (cups to ml) are more reliable for liquids. For dry ingredients, weight (grams) is always more accurate than volume.
• Be aware that some units have different definitions in different countries. A US gallon (3.785 L) is different from a UK gallon (4.546 L).

Ready to try it? Use our free Unit Converter now — no signup required, works entirely in your browser.

Frequently Asked Questions

How many kilometers is a mile?

1 mile equals 1.60934 kilometers. Conversely, 1 kilometer equals 0.621371 miles.

How do I convert Celsius to Fahrenheit?

Multiply by 9/5 and add 32. For example, 20°C = (20 × 9/5) + 32 = 68°F. Key reference points: 0°C = 32°F, 100°C = 212°F.

How many grams are in a pound?

1 pound equals 453.592 grams. 1 kilogram equals 2.205 pounds.