Select a category - Choose Length, Mass, Volume, or Temperature.
2
Enter the value - Type the number you want to convert.
3
Select source unit - Choose the unit of your input value.
4
Select target unit - Choose the unit you want to convert to.
5
Get instant results - The converted value appears automatically.
📐 Length Unit Conversion
1 meter = 3.28084 feet - Standard conversion for construction
1 kilometer = 0.621371 miles - Used for road distances
1 inch = 2.54 cm - Exact conversion for manufacturing
1 foot = 0.3048 meters - Common in real estate
1 mile = 1.60934 kilometers - Used in the US for road distances
⚖️ Mass/Weight Unit Conversion
1 kilogram = 2.20462 pounds - Standard weight conversion
1 pound = 0.453592 kilograms - Used in the US
1 gram = 0.035274 ounces - For small measurements
1 ounce = 28.3495 grams - Common in food packaging
🧴 Volume Unit Conversion
1 liter = 0.264172 gallons - International standard
1 gallon (US) = 3.78541 liters - Common for fuel
1 cup = 0.236588 liters - Standard cooking measurement
1 milliliter = 0.001 liters - For precise measurements
🌡️ Temperature Unit Conversion
°F to °C: Subtract 32, then multiply by 5/9
°C to °F: Multiply by 9/5, then add 32
°C to K: Add 273.15
K to °C: Subtract 273.15
Water freezes at 0°C = 32°F = 273.15 K
Water boils at 100°C = 212°F = 373.15 K
❓ Frequently Asked Questions
What is the difference between metric and imperial units?
Metric system (SI) is based on powers of 10 and used in most countries. Imperial system is used primarily in the US. Metric includes meters, kilograms, liters; Imperial includes feet, pounds, gallons.
How do I convert meters to feet?
Multiply meters by 3.28084. For example, 10 m × 3.28084 = 32.8084 ft. Our converter does this automatically.
How many grams are in a pound?
There are 453.592 grams in one pound. For quick estimation, 1 lb ≈ 454 g.
What's the difference between a US gallon and a UK gallon?
US gallon = 3.78541 liters, UK (Imperial) gallon = 4.54609 liters. This converter uses US gallons.
Why are there different temperature scales?
Celsius is based on water's freezing/boiling points. Fahrenheit was developed earlier. Kelvin is an absolute scale used in science starting at absolute zero.