Unit conversion factors

TC AIM GEN Table 1.6: from unit x factor = into unit. Each direction is its own row. Never divide or use the other direction's factor.

Distance and length:

Fuel volume and weight:

Fuel density:

• kg/L to lb/US gal: x8.333
• kg/L to lb/imp gal: x10.023

Speed (TC AIM GEN Table 1.6; PHAK ch.16):

• Knots to mph: x1.152 (1 kt = 1 NM/h, so the NM-to-SM row).
• Rule of thumb: 1.15. Example: 20 kt = 23 mph.

Imperial vs US gallon (AC 100-001 glossary):

• 1 imp gal = 1.201 US gal
• 1 US gal = 3.785 L
• 1 imp gal = 4.546 L
• Check: imp gal is bigger, so imp to US factor is above 1.

Trap: reverse-direction row (or dividing), or imp-gallon factor where US gallons asked (or vice versa).

Practice