Unit Converter
Convert between hundreds of units across length, weight, volume, temperature, area, speed, and more categories.
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Frequently Asked Questions
What's the difference between mass and weight?
Mass is the amount of matter in an object, measured in kilograms. Weight is the gravitational force on that mass, measured in Newtons. In everyday usage, people often use "weight" to mean mass.
What is the metric system?
The metric system (SI) uses base-10 units — meters for length, kilograms for mass, liters for volume. It's used by most of the world. The US primarily uses the imperial system (feet, pounds, gallons).