Easily convert between length, weight, temperature, volume, area, and speed units.
Understanding measurement systems around the world
Two major measurement systems coexist globally: the metric system (SI) used by most of the world, and the imperial system used primarily in the United States. Understanding both is essential for international communication, travel, cooking, and science. Length: 1 inch = 2.54 cm exactly. 1 foot = 30.48 cm. 1 mile = 1.609 km. 1 meter = 3.281 feet. A useful shortcut: 5 miles ≈ 8 km. Weight: 1 pound = 453.6 grams. 1 kilogram = 2.205 pounds. 1 ounce = 28.35 grams. A 70 kg person weighs about 154 lbs. Temperature: °F = (°C × 9/5) + 32. °C = (°F - 32) × 5/9. Key references: 0°C = 32°F (freezing), 100°C = 212°F (boiling), 37°C = 98.6°F (body temperature), 20°C = 68°F (room temperature). Volume: 1 US gallon = 3.785 liters. 1 liter = 0.264 US gallons. 1 cup (US) = 236.6 mL. Note: UK and US gallons differ — 1 UK gallon = 4.546 liters.
Find answers to common questions
A unit converter is a tool that converts values between different measurement systems. You can convert in different categories like length, weight, temperature, volume, area, and speed.
Other useful calculation tools
1 kilometer = 1000 meters
1 mile = 1.609 kilometers
1 inch = 2.54 centimeters
1 kilogram = 2.205 pounds
1 liter = 1000 milliliters
1 gallon = 3.785 liters
0°C = 32°F = 273.15K
100°C = 212°F = 373.15K
Find answers to common questions
A unit converter is a tool that converts values between different measurement systems. You can convert in different categories like length, weight, temperature, volume, area, and speed.