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Aviation unit converter
The units aviation mixes together, converted as you type.
Pressure
Speed
Climb and descent rate
Distance
Altitude and height
Temperature
Weight
Fuel volume
Why aviation mixes its units
Most of the world’s aviation measures height in feet, speed in knots and distance in nautical miles, but runway lengths and visibility are often in metres, and pressure is in hectopascals in most countries and inches of mercury in others such as the United States. A few countries, including China and Russia, use metres for some flight levels.
Handy values
| Value | Equals |
|---|---|
| Standard pressure | 1013.25 hPa = 29.92 inHg |
| 1 nautical mile | 1.852 km, exactly |
| 1 knot | 1 NM per hour = 1.852 km/h |
| 1 foot | 0.3048 m, exactly |
| Standard temperature | 15 °C = 59 °F, at sea level |
Fuel: volume and weight
Fuel is measured by weight on most airliners but bought by volume. Turning one into the other depends on the fuel’s density, which changes with temperature, so this converter keeps them separate. Jet fuel is usually around 0.8 kg per litre, and the real figure comes from the fuel supplier.
Quick answers
How do you convert hPa to inHg?
Divide by 33.864. Standard pressure of 1013.25 hPa is 29.92 inHg.
How do you convert knots to km/h?
Multiply by 1.852. 250 kt is 463 km/h, and for mph, multiply knots by 1.151.
How do you convert feet to metres?
Multiply by 0.3048. 10,000 ft is 3,048 m.
Related
Other calculators: Crosswind calculator · Wind correction calculator · Separation calculator · Arrival rate calculator · Holding entry calculator · Descent calculator · Speed converter · Altitude calculator · Distance and flight time calculator · UTC and Zulu time converter · Phonetic alphabet translator
For training and simulation only. These calculators are for learning and for games. Their results are automatic, and they don’t account for everything a real operation does. Never use them for real flight planning, navigation or air traffic control. Use your official charts, approved tools and procedures.
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