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What is a meter?

The base SI unit of length, defined by the speed of light

Definition

The meter is the base SI unit of length. It was first defined in 1793 as one ten-millionth of the distance from the equator to the North Pole through Paris. Today it is defined as the distance light travels in vacuum in 1/299,792,458 of a second — a definition tied directly to the universal speed of light. The meter is the foundation of the metric system used by 95% of the world.

Common uses

  • Room dimensions and building measurements in Europe
  • Track-and-field events (100 m, 200 m, 400 m sprint)
  • Scientific papers and engineering drawings worldwide

🌍 Real-world scale

A standard door is about 2 metres tall. An Olympic swimming pool is exactly 50 metres long. The Eiffel Tower is 330 metres tall.

Convert from meters

14 conversions
Meter to Kilometer1 m = 0.001 kmMeter to Centimeter1 m = 100 cmMeter to Millimeter1 m = 1,000 mmMeter to Mile1 m = 0.0006214 miMeter to Yard1 m = 1.09361 ydMeter to Foot1 m = 3.28084 ftMeter to Inch1 m = 39.3701 inMeter to Nautical Mile1 m = 0.00054 nmiMeter to Micrometer1 m = 1,000,000 µmMeter to Nanometer1 m = 1,000,000,000 nmMeter to Light Year1 m = 1.0570e-16 lyMeter to Furlong1 m = 0.004971 furMeter to Fathom1 m = 0.5468 ftmMeter to Angstrom1 m = 10,000,000,000 Å

Convert to meters

14 conversions
Kilometer to Meter1 km = 1,000 mCentimeter to Meter1 cm = 0.01 mMillimeter to Meter1 mm = 0.001 mMile to Meter1 mi = 1,609.34 mYard to Meter1 yd = 0.9144 mFoot to Meter1 ft = 0.3048 mInch to Meter1 in = 0.0254 mNautical Mile to Meter1 nmi = 1,852 mMicrometer to Meter1 µm = 1.0000e-6 mNanometer to Meter1 nm = 1.0000e-9 mLight Year to Meter1 ly = 9.4607e15 mFurlong to Meter1 fur = 201.168 mFathom to Meter1 ftm = 1.8288 mAngstrom to Meter1 Å = 1.0000e-10 m

Tips

  • 1 metre ≈ 3.28 feet — multiply by 3.28 for a quick foot conversion.
  • The height of an average adult is 1.6 to 1.8 metres — useful for sanity-checking lengths.
  • For very small or very large quantities use prefixes: 1 km = 1000 m, 1 mm = 0.001 m.

Common mistakes

  • Confusing square metres (area) with metres (length). A 20 m² room is not 20 m long.
  • Using 3.3 instead of 3.2808 when converting to feet — the error grows on long distances.
  • Writing "meter" when you mean "metre" in British English, or vice versa. Both are accepted but follow one convention per document.

FAQ about the meter

What is a meter?
The meter is the base SI unit of length. It was first defined in 1793 as one ten-millionth of the distance from the equator to the North Pole through Paris. Today it is defined as the distance light travels in vacuum in 1/299,792,458 of a second — a definition tied directly to the universal speed of light. The meter is the foundation of the metric system used by 95% of the world.
Where is the meter used?
The meter is commonly used for: Room dimensions and building measurements in Europe; Track-and-field events (100 m, 200 m, 400 m sprint); Scientific papers and engineering drawings worldwide.
What is an example of a meter in real life?
A standard door is about 2 metres tall. An Olympic swimming pool is exactly 50 metres long. The Eiffel Tower is 330 metres tall.
What category does the meter belong to?
The meter is a unit of length, part of the 15-unit length category on UnitConv.
How accurate are meter conversions?
All conversion factors follow NIST and BIPM international standards to 8 significant figures — the highest practical accuracy.
Explore all 15 length units and their conversions.📏 Length hub →