What Is the Metric System?
The metric system is a decimal-based system of measurement used by most of the world, formalized as the International System of Units (SI). Its base units include the meter (length), kilogram (mass), second (time), and kelvin (temperature). Prefixes such as kilo- (×1,000) and milli- (÷1,000) scale units by powers of ten.
Common Prefixes
kilo = 1,000; centi = 1/100; milli = 1/1,000; micro = 1/1,000,000.
Why It Is Easy to Convert Within
Because every unit is related by a power of ten, converting within the metric system only moves the decimal point: 2.5 kilometers is 2,500 meters, and 750 milliliters is 0.75 liters. Converting to non-metric units, by contrast, requires a specific conversion factor.
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Last updated: September 27, 2026. This definition is for general educational purposes only. It is not financial, investment, tax, legal, or medical advice, and it does not recommend any product or course of action. For decisions about your own situation, consult a qualified professional.