# How to convert feet to miles?

Converts feet (ft) to miles (mi) and back, with the exact unit definitions.

- Page: https://www.acalculator.org/convert/feet-to-miles
- JSON spec: https://www.acalculator.org/convert/feet-to-miles.json
- Version: 0deb1bc1b34c

## Default answer

Example with the default inputs (Feet (ft) 1): 1 ft = 0.000189 mi.

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| value | Feet (ft) | The amount in feet to convert. |
| result | Miles (mi) | The same amount in miles. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| value | Feet (ft) | The amount in feet to convert. |
| result | Miles (mi) | The amount in miles. |

## Method

mi = ft × 0.000189393939394 (the same as ft ÷ 5280)

## Assumptions

- 1 foot = 0.000189393939394 miles, 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 = 0.000189. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
2. value = 5,280 gives result = 1. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
3. result = 1 gives value = 5,280. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.

## FAQ

### How many miles are in a foot?

1 foot is 0.000189 miles, from the exact unit definitions (NIST SP 811).

### How do I convert feet to miles?

Multiply by 0.000189: mi = ft × 0.000189393939394 (the same as ft ÷ 5280). For example, 1 ft × 0.000189 = 0.000189 mi.

### How do I convert miles back to feet?

Multiply by 5,280, or type the miles into the second box and the converter works it out. 1 mile is 5,280 feet.

### How many feet are in a mile?

5,280, so miles = feet ÷ 5,280. A mile is 5,280 ft, 1,609.344 m exactly (NIST).

### What is 10,000 feet in miles?

1.893939 mi: 10,000 ÷ 5,280.

## 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
- NIST, U.S. Survey Foot: Revised Unit Conversion Factors: 1 acre = 43,560 ft² = 4,046.856 422 4 m² and 1 mile = 5,280 ft = 1,609.344 m, exact with the international foot, retrieved 2026-10-18. https://www.nist.gov/pml/us-surveyfoot/revised-unit-conversion-factors