---
title: "Inches to Astronomical units — in to AU converter"
description: "1 inch = 1.698 × 10^-13 astronomical units. Convert inches to astronomical units with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/inches-to-astronomical-units/
site: "At One Place"
---

# Inches to astronomical units

**1 inch in astronomical units: 1 in = 1.698 × 10^-13 AU**

AU = in × 1.697885129 × 10^-13

To convert inches to astronomical units, multiply by 1.697885129 × 10^-13. The table below gives the values people look up most often, and the converter works for any number.

## Inches to astronomical units table

*Common inch values converted to astronomical units.*

| Inches | Astronomical units |
| --- | --- |
| 1 in | 1.698 × 10^-13 |
| 2 in | 3.396 × 10^-13 |
| 3 in | 5.094 × 10^-13 |
| 4 in | 6.792 × 10^-13 |
| 5 in | 8.489 × 10^-13 |
| 10 in | 1.698 × 10^-12 |
| 15 in | 2.547 × 10^-12 |
| 20 in | 3.396 × 10^-12 |
| 25 in | 4.245 × 10^-12 |
| 30 in | 5.094 × 10^-12 |
| 40 in | 6.792 × 10^-12 |
| 50 in | 8.489 × 10^-12 |
| 75 in | 1.273 × 10^-11 |
| 100 in | 1.698 × 10^-11 |
| 250 in | 4.245 × 10^-11 |
| 500 in | 8.489 × 10^-11 |
| 1,000 in | 1.698 × 10^-10 |

## How the conversion works

The relationship is AU = in × 1.697885129 × 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 astronomical units are in one inch?

One inch equals 1.698 × 10^-13 astronomical units. AU = in × 1.697885129 × 10^-13.

### How do you convert inches to astronomical units?

Use AU = in × 1.697885129 × 10^-13. So 10 in is 1.698 × 10^-12 AU.

### How many inches are in one astronomical unit?

One astronomical unit equals 5,889,679,900,000 inches, which is the reverse of the conversion above.

## Related pages

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

## 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/)