Switch between the metric and imperial units that fill ATPL questions and the flight deck — including fuel volume to mass with a chosen density.
Switch between the units that show up across ATPL study and the flight deck — distance, speed, altitude, mass, volume, pressure, temperature, and fuel volume ↔ mass.
Enter a value to convert.
Litres and gallons convert to kilograms and pounds through density. Jet A-1 is roughly 0.80 kg/L; always confirm with the load sheet.
1013.25 hPa equals 29.92 inHg. The converter keeps the altimetry pair consistent so subscale settings line up.
Drilling the common conversions — NM/km, kg/lb, ft/m — until they are instant removes a whole class of avoidable ATPL mistakes.
Distance (NM, km, miles, m, ft), altitude (ft, m, flight level), speed (kt, mph, km/h, m/s, ft/min), mass, volume, pressure, temperature, and fuel volume ↔ mass.
Fuel volume to mass uses a density. Pick a preset (Jet A-1, Jet A, AVGAS, water) or enter a custom kg/L figure. Always use the load-sheet density for dispatch.
EASA ATPL questions mix metric and imperial units constantly — feet, metres, knots, kg, pounds, litres, gallons, hPa, inHg. Fast, reliable conversion saves time in the exam.
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