# How do I convert inches to meters?

Converts inches (in) to meters (m) and back, with the exact unit definitions.

- Page: https://www.acalculator.org/convert/inches-to-meters
- JSON spec: https://www.acalculator.org/convert/inches-to-meters.json
- Version: adbe70c8e55c

## Default answer

Example with the default inputs (Inches (in) 1): 1 in = 0.0254 m.

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| value | Inches (in) | The amount in inches to convert. |
| result | Meters (m) | The same amount in meters. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| value | Inches (in) | The amount in inches to convert. |
| result | Meters (m) | The amount in meters. |

## Method

m = in × 0.0254

## Assumptions

- 1 inch = 0.0254 meters, from the exact definitions in NIST SP 811.
- Exact on the typed decimals: at most 6 decimal places (6 significant digits below 0.0001), rounded half up; an answer of 1 billion or more shows at most 15 significant digits.

## Worked examples

1. value = 1 gives result = 0.0254. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
2. value = 12 gives result = 0.3048. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
3. result = 0.3048 gives value = 12. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.

## FAQ

### How many meters are in an inch?

1 inch is 0.0254 meters, from the exact unit definitions (NIST SP 811).

### How do I convert inches to meters?

Multiply by 0.0254: m = in × 0.0254. For example, 1 in × 0.0254 = 0.0254 m.

### How do I convert meters back to inches?

Multiply by 39.370079, or type the meters into the second box and the converter works it out. 1 meter is 39.370079 inches.

### What is 12 inches in meters?

0.3048 m, which is 1 foot: 12 × 0.0254.

### What is 100 inches in meters?

2.54 m: 100 × 0.0254.

## Sources

- NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B.8: Factors for Units Listed Alphabetically (bold factors are exact), retrieved 2026-10-18. https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8