---
title: "Light-years to Miles — ly to mi converter"
description: "1 light-year = 5,878,625,400,000 miles. Convert light-years to miles with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/light-years-to-miles/
site: "At One Place"
---

# Light-years to miles

**1 light-year in miles: 1 ly = 5,878,625,400,000 mi**

mi = ly × 5,878,625,373,000

To convert light-years to miles, multiply by 5,878,625,373,000. The table below gives the values people look up most often, and the converter works for any number.

## Light-years to miles table

*Common light-year values converted to miles.*

| Light-years | Miles |
| --- | --- |
| 1 ly | 5,878,625,400,000 |
| 2 ly | 11,757,251,000,000 |
| 3 ly | 17,635,876,000,000 |
| 4 ly | 23,514,501,000,000 |
| 5 ly | 29,393,127,000,000 |
| 10 ly | 58,786,254,000,000 |
| 15 ly | 88,179,381,000,000 |
| 20 ly | 117,572,510,000,000 |
| 25 ly | 146,965,630,000,000 |
| 30 ly | 176,358,760,000,000 |
| 40 ly | 235,145,010,000,000 |
| 50 ly | 293,931,270,000,000 |
| 75 ly | 440,896,900,000,000 |
| 100 ly | 587,862,540,000,000 |
| 250 ly | 1.4696563 × 10^15 |
| 500 ly | 2.9393127 × 10^15 |
| 1,000 ly | 5.8786254 × 10^15 |

## How the conversion works

The relationship is mi = ly × 5,878,625,373,000. 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 miles are in one light-year?

One light-year equals 5,878,625,400,000 miles. mi = ly × 5,878,625,373,000.

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

Use mi = ly × 5,878,625,373,000. So 10 ly is 58,786,254,000,000 mi.

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

One mile equals 1.701 × 10^-13 light-years, which is the reverse of the conversion above.

## Related pages

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