Aviation Unit Converter

Convert speed, distance, pressure, weight, fuel volume and mass, and temperature. Knots, nautical miles, hPa, inHg, kilograms, pounds, litres and gallons in one place.

Common conversions

• 1 knot = 1.852 km/h = 1.15078 mph
• 1 nautical mile = 1.852 km = 1.15078 statute miles
• 1 inHg = 33.8639 hPa. Standard pressure is 1013.25 hPa or 29.92 inHg.
• 1 kg = 2.20462 lb
• 1 US gallon = 3.78541 litres. 1 imperial gallon = 4.54609 litres.
• 15 °C = 59 °F = 288.15 K

Fuel density

Turning fuel volume into mass needs the density. Jet A-1 is typically about 0.80 kg per litre and avgas about 0.72, but both change with temperature and batch. Use the density from your fuel delivery ticket for real figures.