Complete Unit Conversion Guide
Whether you're cooking, traveling, or doing science homework, unit conversion is a skill you'll use regularly. This guide covers the most common conversions with easy formulas.
Length Conversions
1 inch = 2.54 cm. 1 foot = 30.48 cm = 0.3048 m. 1 mile = 1.609 km. 1 meter = 3.281 feet. Quick tip: To convert km to miles, multiply by 0.62. To convert miles to km, multiply by 1.61.
Weight Conversions
1 pound (lb) = 0.4536 kg = 453.6 g. 1 kg = 2.205 lbs. 1 ounce (oz) = 28.35 g. 1 stone = 6.35 kg = 14 lbs. Quick tip: To roughly convert kg to lbs, double the kg and add 10%.
Temperature Conversions
°F to °C: (°F - 32) × 5/9. °C to °F: (°C × 9/5) + 32. Key points: 0°C = 32°F (water freezes). 100°C = 212°F (water boils). 37°C = 98.6°F (body temperature). -40°C = -40°F (they meet!).
Volume Conversions
1 gallon (US) = 3.785 liters. 1 liter = 0.264 US gallons. 1 cup = 236.6 ml. 1 tablespoon = 14.79 ml. 1 fluid ounce = 29.57 ml. Note: UK/Imperial gallon = 4.546 liters (larger than US).