Convert Feet per pound to Nautical miles per pound
Convert Feet per pound (ft/lb) to Nautical miles per pound (nmi/lb) instantly and accurately.
Conversion Formula
nmi/lb = ft/lb × 0.0001645788337
About Feet per pound
The foot per pound (ft/lb) equals ≈6.720 × 10⁻⁴ km/kg, the smallest practical mass-efficiency unit. It appears in historical US Army ballistic tables and early solid-propellant rocket motor test sheets where range was in feet and propellant charge in pounds. 1 ft/lb ≈6.720 × 10⁻⁴ km/kg ≈1/3 the size of a metre per pound.
About Nautical miles per pound
The nautical mile per pound (nmi/lb) equals ≈4.083 km/kg, the standard fuel efficiency unit in US and NATO aviation engineering. Range planning for US Navy, USAF, and FAA-certified aircraft uses nmi/lb or gallons/nmi; ICAO fuel planning worksheets include nmi/lb columns. Typical values: commercial turbofan 0.10-0.25 nmi/lb; turboprop commuter 0.08-0.15 nmi/lb. 1 nmi/lb ≈4.083 km/kg.
Quick Reference Table
| Feet per pound (ft/lb) | Nautical miles per pound (nmi/lb) |
|---|---|
| 1 ft/lb | 0.000164579 nmi/lb |
| 2 ft/lb | 0.000329158 nmi/lb |
| 5 ft/lb | 0.000822894 nmi/lb |
| 10 ft/lb | 0.00164579 nmi/lb |
| 25 ft/lb | 0.00411447 nmi/lb |
| 50 ft/lb | 0.00822894 nmi/lb |
| 100 ft/lb | 0.0164579 nmi/lb |