Meters to Inches
Convert meters (m) to inches (in). Both measure distance and dimension, and the conversion comes up in construction, navigation, sports work.
The Formula
``
inches = meters × 39.3700787402
meters = inches × 0.0254
`
One meter is 39.3701 inches, and one inch is 0.0254 meters.
Conversion Table
| Meters | Inches |
|---|---|
| 1 m | 39.3701 in |
| 2 m | 78.7402 in |
| 5 m | 196.8504 in |
| 10 m | 393.7008 in |
| 25 m | 984.252 in |
| 50 m | 1,968.5 in |
| 100 m | 3,937.01 in |
| 500 m | 19,685.04 in |
| 1,000 m | 39,370.08 in |
The Other Direction
| Inches | Meters |
|---|---|
| 1 in | 0.0254 m |
| 2 in | 0.0508 m |
| 5 in | 0.127 m |
| 10 in | 0.254 m |
| 25 in | 0.635 m |
| 50 in | 1.27 m |
| 100 in | 2.54 m |
| 500 in | 12.7 m |
| 1,000 in | 25.4 m |
What Each Unit Is
Meters (m) — the distance light travels in a vacuum in 1/299,792,458 of a second — the SI base unit of length. Defined in 1793 as one ten-millionth of the distance from the equator to the North Pole, then by a platinum bar, and since 1983 by the speed of light.
Inches (in) — exactly 2.54 centimetres — an exact figure, not a rounded one. From the Latin uncia, one twelfth (of a foot); the exact metric value was agreed in 1959.
A Sense of Scale
A doorway is about 2 m tall- An Olympic pool is 50 m
- A city block is 80–120 m
- A thumb is about an inch wide
- Screens are measured diagonally in inches
- US rainfall is in inches
Doing It in Your Head
Multiply by 39. That is off by 0.94% — close enough to judge a
distance, a weight or a price, and not close enough to sign off on a drawing.
Exact Mental shortcut 393.7008 in 390 in 3,937.01 in 3,900 in
Precision
The factor 39.3700787402 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.
Watch Out For
- Because the inch is exactly 2.54 cm, inch↔cm conversions are exact and any rounding you see comes from your own input precision, not the factor.
In Code
`javascript
const meterToInch = (value) => value * 39.3700787402;
``
Where This Conversion Comes Up
- Construction
- Navigation
- Sports
- Sewing
- Mapping
How Many Decimals Do You Need?
Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 m with the factor truncated at each decimal place:
| Decimals kept | Factor | 137 m becomes | Error |
|---|---|---|---|
| 0 | 39 | 5,343 | 0.9400% |
| 1 | 39.4 | 5,397.8 | 0.0760% |
| 2 | 39.37 | 5,393.69 | 0.0002% |
| 3 | 39.37 | 5,393.69 | 0.0002% |
| 4 | 39.3701 | 5,393.7 | — |
The right number of significant figures is set by your input, not by the converter. If you measured meters to three significant figures, the answer in inches is only good to three — writing more digits claims precision the measurement never had.