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ScienceQuest

Length conversion

5 units, with m as the base. Every value in the factor table is the number you multiply by, so reading across a row converts out of that unit and reading down a column converts into it.

Factor table

Length conversion factors. Each cell is the value to multiply the row unit by to get the column unit.
from \ to nmµmmmcmm
nm 1 0.001 1 × 10⁻⁶ 1 × 10⁻⁷ 1 × 10⁻⁹
µm 1000 1 0.001 1 × 10⁻⁴ 1 × 10⁻⁶
mm 1 × 10⁶ 1000 1 0.1 0.001
cm 1 × 10⁷ 10,000 10 1 0.01
m 1 × 10⁹ 1 × 10⁶ 1000 100 1

Prefixes such as milli, micro and kilo follow the SI prefixes table.

The values are facts and free to use; this table’s selection and presentation are © 2026 ScienceQuest.

Worked example

  1. 1 cm in m
  2. = 1 × 0.01
  3. = 0.01 m

Convert a number

The table gives the factor; the unit converter does the arithmetic, remembers the units you picked, and turns any conversion into a link you can share.

Calculators that use length

Other quantities