Convert Inch to Meter
Convert inches to meters instantly. 1 inch = 0.0254 meter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Meter to Inch converter for the reverse conversion.
Units explained
Inch
An inch is an Imperial and US customary unit of length defined since 1959 as exactly 25.4 millimeters (0.0254 meters). It is still the standard small unit of length in the United States, the United Kingdom (informally), and a few other countries.
The inch derives from the Roman uncia (one-twelfth of a foot) and survived through Anglo-Saxon and medieval English measurement systems. Various definitions persisted regionally until the 1959 International Yard and Pound Agreement standardized the inch globally as exactly 25.4 mm.
Inches are used in the US and UK for body height, screen sizes (TVs, monitors, phones), tire sizes, plumbing, lumber, paper sizes (US Letter is 8.5 × 11 in), and most consumer product specifications in the United States.
Anglo-Saxon origin (predating 1066); standardized to 25.4 mm exactly by the International Yard and Pound Agreement of 1959, signed by the US, UK, Canada, Australia, New Zealand, and South Africa.
Meter
The meter is the SI base unit of length. Since 2019, the meter has been defined by fixing the numerical value of the speed of light in vacuum to exactly 299,792,458 meters per second. Every other SI length unit derives from the meter.
The meter was originally defined in 1793 by the French Academy of Sciences as one ten-millionth of the distance from the equator to the North Pole along a meridian through Paris. It has been redefined multiple times — by physical prototype, then by atomic transitions, and finally in 2019 by fundamental physical constants.
The meter is the international standard for length in science, engineering, construction, athletics, and everyday measurement in metric countries. It underpins definitions of area (m²), volume (m³), and most derived SI units.
Established 1793 in France; ratified internationally via the Metre Convention 1875; redefined in 1960, 1983, and most recently 2019 when the SI redefinition fixed it to the speed of light.
Inch to Meter conversion formula
The relationship between inches and meters:
To convert inches to meters, multiply the value in inches by 0.0254. To reverse, multiply meters by 39.3700787402.
How to use this converter
Type a value into the calculator. The result in meters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Meter to Inch converter for the reverse direction.
Step-by-step: convert inches to meters
- Write down the value in inches (in).
- Multiply that value by the factor 0.0254.
- The product is the equivalent value in meters (m).
- To reverse, multiply the meter value by 39.3700787402.
Worked examples
Example 1 — Convert 1 in to m:
1 × 0.0254 = 0.0254 m
Example 2 — Convert 100 in to m:
100 × 0.0254 = 2.54 m
Real-world example — Standard plywood sheet length
A 120-inch sheet of plywood (10 feet) is 3.048 m. International architects spec ply in meters; the US lumberyard sells the same product by inches and feet — the conversion bridges every cross-border construction job.
120 in × 0.0254 = 3.048 m
Real-world example — Custom suit-jacket measurements
A 60-inch chest measurement equals 1.524 m. International bespoke-tailoring suppliers sometimes quote chest sizes in metres on technical pattern sheets; converting from the inches a US tailor measured to the metric pattern is routine.
60 in × 0.0254 = 1.524 m
Real-world example — Industrial conveyor lengths
A 300-inch conveyor section equals 7.62 m. US factories specifying conveyor lines in inches receive German-made conveyor sections in meters; converting between the two is part of every plant-engineering project.
300 in × 0.0254 = 7.62 m
Inch to Meter conversion table
Standard reference values for converting inches to meters:
| Inch [in] | Meter [m] |
|---|---|
| 0.01 | 0.000254 |
| 0.1 | 0.00254 |
| 1 | 0.0254 |
| 2 | 0.0508 |
| 3 | 0.0762 |
| 4 | 0.1016 |
| 5 | 0.127 |
| 10 | 0.254 |
| 20 | 0.508 |
| 30 | 0.762 |
| 40 | 1.016 |
| 50 | 1.27 |
| 100 | 2.54 |
| 500 | 12.7 |
| 1000 | 25.4 |
Frequently asked questions
How many meters is 1 inch?
How do I convert inches to meters?
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Popular length unit conversions
Convert Inch to other length units
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Metric / SI (18 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Astronomical (9 units)
Atomic / Physics (6 units)
Typographic (3 units)
Sources & references
Conversion factor (1 in = 0.0254 m) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.