---
title: "Miles to Light-years — mi to ly converter"
description: "1 mile = 1.701 × 10^-13 light-years. Convert miles to light-years with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/miles-to-light-years/
site: "At One Place"
---

# Miles to light-years

**1 mile in light-years: 1 mi = 1.701 × 10^-13 ly**

ly = mi × 1.70107795 × 10^-13

To convert miles to light-years, multiply by 1.70107795 × 10^-13. The table below gives the values people look up most often, and the converter works for any number.

## Miles to light-years table

*Common mile values converted to light-years.*

| Miles | Light-years |
| --- | --- |
| 1 mi | 1.701 × 10^-13 |
| 2 mi | 3.402 × 10^-13 |
| 3 mi | 5.103 × 10^-13 |
| 4 mi | 6.804 × 10^-13 |
| 5 mi | 8.505 × 10^-13 |
| 10 mi | 1.701 × 10^-12 |
| 15 mi | 2.552 × 10^-12 |
| 20 mi | 3.402 × 10^-12 |
| 25 mi | 4.253 × 10^-12 |
| 30 mi | 5.103 × 10^-12 |
| 40 mi | 6.804 × 10^-12 |
| 50 mi | 8.505 × 10^-12 |
| 75 mi | 1.276 × 10^-11 |
| 100 mi | 1.701 × 10^-11 |
| 250 mi | 4.253 × 10^-11 |
| 500 mi | 8.505 × 10^-11 |
| 1,000 mi | 1.701 × 10^-10 |

## How the conversion works

The relationship is ly = mi × 1.70107795 × 10^-13. Both units measure length, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two.

## Common questions

### How many light-years are in one mile?

One mile equals 1.701 × 10^-13 light-years. ly = mi × 1.70107795 × 10^-13.

### How do you convert miles to light-years?

Use ly = mi × 1.70107795 × 10^-13. So 10 mi is 1.701 × 10^-12 ly.

### How many miles are in one light-year?

One light-year equals 5,878,625,400,000 miles, which is the reverse of the conversion above.

## Related pages

- [Light-years to Miles](https://atoneplace.net/convert/light-years-to-miles/)
- [Miles to Meters](https://atoneplace.net/convert/miles-to-meters/)
- [Miles to Kilometers](https://atoneplace.net/convert/miles-to-km/)
- [Miles to Centimeters](https://atoneplace.net/convert/miles-to-cm/)
- [Miles to Millimeters](https://atoneplace.net/convert/miles-to-mm/)
- [Miles to Yards](https://atoneplace.net/convert/miles-to-yards/)
- [Miles to Feet](https://atoneplace.net/convert/miles-to-feet/)
- [Miles to Inches](https://atoneplace.net/convert/miles-to-inches/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)