length · m
Meter (m)
The meter (m) is the SI base unit of length. One meter is defined via the speed of light: the distance light travels in vacuum in 1/299,792,458 of a second.
Definition
The meter (m) is the SI base unit of length. One meter is defined via the speed of light: the distance light travels in vacuum in 1/299,792,458 of a second.
History & origin
Originally tied to a fraction of Earth’s meridian, the meter was later realized with platinum bars and, since 1983, by the speed of light.
Conversion formula
cm = m × 100 · ft ≈ m × 3.28084 · km = m ÷ 1000
Frequently asked questions
- How many feet in a meter?
- About 3.281 feet.
- Is meter the same as metre?
- Yes — American spelling is meter; British spelling is metre.
- How many cm is 1.75 m?
- 175 cm.
Related units
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