Units
Length, weight, volume
100
Centimeters
Frequently Asked Questions
What unit systems are commonly used?
The metric system (SI) is used globally for science. The imperial system is used in the US for everyday measurements. Both coexist in many countries.
How do I convert between metric and imperial?
Common conversions: 1 inch = 2.54 cm, 1 mile = 1.609 km, 1 pound = 0.454 kg, 1 gallon (US) = 3.785 liters, °F = °C × 9/5 + 32.
What is the difference between mass and weight?
Mass is the amount of matter (measured in kg), constant everywhere. Weight is the force of gravity on mass (measured in Newtons), varies by location.