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Metric Prefixes and SI Units

ChemistryUpdated October 25, 2026

Metric prefixes, factors, and SI base units for Chemistry.

Metric Prefixes and SI Units

Metric prefix Giga (G): factor of 10^9.

Metric prefix Mega (M): factor of 10^6.

Metric prefix Kilo (k): factor of 10^3.

Metric prefix Centi (c): factor of 10^-2.

Metric prefix Milli (m): factor of 10^-3.

Metric prefix Micro (μ): factor of 10^-6.

Metric prefix Nano (n): factor of 10^-9.

Metric prefix Pico (p): factor of 10^-12.

Mass SI base unit: Kilogram (kg).

Length SI base unit: Meter (m).

Time SI base unit: Second (sec).

Temperature SI base unit: Kelvin (K).

Amount of substance SI base unit: Mole (mol).

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