Aviation Tool

Aviation Unit Converter

Convert between knots, km/h, nautical miles, feet, inHg, hPa, Celsius, and more. Tap any result to convert from that unit.

Knots

KTS

Tap any result row to convert from that unit.

Speed Conversions

About

Converts between the most common aviation units across six categories: speed, distance, altitude, pressure, temperature, and weight. Tap any result row to use that value as the new input and convert from that unit instead.

How to Use

1Select a category from the tabs at the top - Speed, Distance, Altitude, Pressure, Temperature, or Weight.
2Type a value into the input field. The active unit is shown in the top-right of the input row.
3All conversions for that category update instantly below.
4Tap any result row to set that unit as the new source and convert from it.

Tips

//Pressure: standard sea-level QNH is 29.92 inHg or 1013.25 hPa - useful to sanity-check altimeter settings.
//Speed: 1 knot = 1 nautical mile per hour. Multiply by 1.852 for km/h or 1.151 for mph.
//Altitude: Flight Level is in hundreds of feet - FL350 = 35,000 ft. Use the FL row for quick FL-to-feet conversions.
//Temperature: ISA sea level is 15°C (59°F). Standard lapse rate is roughly -2°C per 1000 ft.
//Weight: jet fuel is typically 0.8 kg per litre, so 1000 kg of fuel is about 1250 litres.

FAQ

Why are nautical miles used in aviation instead of kilometres?: One nautical mile equals one minute of arc of latitude, which makes chart reading and position calculation straightforward on aeronautical charts. It is an international standard adopted by ICAO across all member states.
What is the difference between inHg and hPa for altimeter settings?: Both measure the same thing - atmospheric pressure. The United States and Canada use inHg; most of the rest of the world uses hPa (or the equivalent millibar). Standard sea-level pressure is 29.92 inHg or 1013.25 hPa.