# Metric to Inches Calculator

URL: https://speedycalculator.com/calculators/conversion/metric-to-inches/
Last updated: 2026-10-25

> The metric to inches calculator converts millimetres, centimetres or metres to inches, both as a decimal and as the nearest fraction, plus feet and inches for longer lengths.

## Inputs

- Metric length (mm, m, cm)

## Results

- Inches
- Nearest 1/16″
- Feet and inches

## Formula

```
inches = mm ÷ 25.4 = cm ÷ 2.54 = m × 39.37
```

## Explanation

Tape measures in the U.S. show inches and fractions; metric drawings show millimetres. This bridges the two at the precision of a typical tape (1/16″).

### How to use the Metric to Inches Calculator

- **Metric length**
- Every result field is editable: type into **Inches** and **Metric length** plus every other field update to match.

Results update as you type, and every field accepts the units shown in its menu.

### How it works

The metric length is converted to inches and also rounded to the nearest sixteenth.

### What each result means

- **Inches** = [Metric length] ÷ 0.0254
- **Nearest 1/16″** = round([Metric length] ÷ 0.0254 × 16) ÷ 16
- **Feet and inches** = [Metric length] ÷ 0.0254

### Example values

How the main result changes when **Metric length** changes and everything else stays at the example values above:

Metric length (mm)Inches (in)752.9528112.54.42911505.9055187.57.38192258.858330011.811

## Worked example

Inputs — Metric length: 150 mm.

Results — **Inches = 5.9055 in**; Nearest 1/16″ = 5 7/8; Feet and inches = 0 ft 5 7/8 in.

## FAQ

**How many inches is 150 mm?**
About 5.906 in, or 5 15/16″.

**How many inches is 1 m?**
About 39.37 in.

**What formula does the Metric to Inches Calculator use?**
inches = mm ÷ 25.4 = cm ÷ 2.54 = m × 39.37.


## Sources

- [NIST Special Publication 811 – Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44 Appendix C – General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)