To convert inches to astronomical units, multiply by 1.697885129e-13.
The calculation uses 1 in = 1.697885129e-13 AU. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.
The formula
value in AU = value in in × 1.697885129e-13
in- Input unit: inches
AU- Output unit: astronomical units
How to use this calculator
- Enter a value in in.
- Multiply by the stored conversion factor.
- Read the result in AU; divide by the same factor to convert back.
Worked examples
Worked conversion
1 in × 1.697885129e-13 ≈ 1.697885129e-13 AU.
Reverse conversion
1.697885129e-13 AU ÷ 1.697885129e-13 ≈ 1 in. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 1.697885129e-13 AU per in.
Why can another converter show a slightly different answer?
Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.
in to AU table
| in | AU (rounded) |
|---|---|
| 0 | 0 |
| 1 | 1.697885129e-13 |
| 2 | 3.395770258e-13 |
| 5 | 8.489425645e-13 |
| 10 | 1.697885129e-12 |
| 100 | 1.697885129e-11 |
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