Aviation unit converter
Updated: Sources checked on 3 November 2026
In short
Choose the conversion and enter the value. One nautical mile is exactly 1,852 metres, one foot exactly 0.3048 metres, and one knot is one nautical mile per hour. One inch of mercury corresponds to 33.86389 hectopascals.
The factors
| Unit | Value | exact? |
|---|---|---|
| 1 nautical mile (NM) | 1,852 m | yes |
| 1 knot (kt) | 1 NM per hour = 1.852 km/h ≈ 0.5144 m/s | yes (km/h) |
| 1 foot (ft) | 0.3048 m | yes |
| 1 mile (statute mile) | 1,609.344 m | yes |
| 1 inch of mercury (inHg) | 33.86389 hPa | rounded |
| Temperature | °C = (°F − 32) / 1.8 | yes |
Sources
- 1. NIST Guide to the SI, Appendix B.8: Factors for Units Listed Alphabetically (Special Publication 811) (NIST, accessed 3 November 2026)
Related topics
- Calculators for the PPL theory Free calculators for the PPL theory: exam deadlines under FCL.025, crosswind and headwind components, and aviation unit conversions.
- Crosswind calculator Calculate crosswind and headwind components from runway, wind direction and wind speed, including gusts and a note on true versus magnetic direction.
Practise with the app
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