Convert Foot-Pounds per Pound to BTU per Pound
Instantly convert Foot-Pounds per Pound (ft·lbf/lb) to BTU per Pound (BTU/lb) with our free online calculator.
Formula: ft·lbf/lb to BTU/lb — multiply by 0.00128507
Reference Table
| Foot-Pounds per Pound (ft·lbf/lb) | BTU per Pound (BTU/lb) |
|---|---|
| 1 | 0.00128507 |
| 5 | 0.00642534 |
| 10 | 0.0128507 |
| 25 | 0.0321267 |
| 50 | 0.0642534 |
| 100 | 0.128507 |
How to Convert Foot-Pounds per Pound to BTU per Pound
Formula
To convert Foot-Pounds per Pound (ft·lbf/lb) to BTU per Pound (BTU/lb): multiply by 0.00128507
Step-by-Step
- Start with your value in Foot-Pounds per Pound (ft·lbf/lb).
- Multiply by 0.00128507 to perform the conversion.
- The result is your value expressed in BTU per Pound (BTU/lb).
Conversion Factor
1 ft·lbf/lb = 0.00128507 BTU/lb
Reverse Factor
1 BTU/lb = 778.168 ft·lbf/lb
Worked Example
Convert 25 Foot-Pounds per Pound to BTU per Pound: 25 ft·lbf/lb = 0.0321267 BTU/lb
About Foot-Pound per Pound (ft·lbf/lb)
An imperial specific-energy unit equal to approximately 2.98907 J/kg (1 ft·lbf = 1.35582 J; 1 lb = 0.45359237 kg; ratio = 2.98907). ft·lbf/lb is a niche US-engineering unit used primarily in: ballistic kinetic-energy-per-mass calculations (E_k/m for projectiles, where US ballistics literature historically uses imperial mass for the projectile and ft·lbf for muzzle energy — a .308 Winchester 168gr bullet at 2,650 fps muzzle velocity has specific energy ~109,000 ft·lbf/lb), US-edition mechanical-engineering textbooks for mechanical strain-energy-per-mass calculations (Shigley, Norton, Hibbeler in dual-unit editions), and head-loss / hydraulic-energy specific calculations in US civil-engineering hydraulics where the natural unit is feet-of-head (1 ft of head of water ≈ 1 ft·lbf/lb specific gravitational potential). For typical engineering specific-energy scales (gasoline, batteries, structural-strain energy), the ft·lbf/lb numerical value is large and unwieldy — gasoline LHV is ~15.5 million ft·lbf/lb — so US engineers usually convert to BTU/lb for fuel work and reserve ft·lbf/lb for kinetic and elastic-strain applications. Convert ft·lbf/lb to J/kg by multiplying by 2.98907.
About BTU per Pound (BTU/lb)
An imperial specific-energy unit equal to exactly 2,326 J/kg (1 BTU/lb = 1,055.06 J / 0.45359237 kg = 2,326.000 J/kg). BTU/lb is dominant on US steam tables, HVAC enthalpy/psychrometric calculations per ASHRAE Handbook Fundamentals chapter 1, heating-fuel and refining specific-energy reporting per API MPMS and GPSA Engineering Data Book, and natural-gas heating-value certification. Reference values: natural gas heating value (residential pipeline grade) ~22,000 BTU/lb HHV (higher heating value with water-vapor condensation credit); LNG 21,500 BTU/lb; #2 fuel oil ~19,500 BTU/lb; gasoline 19,500-20,000 BTU/lb LHV; coal anthracite 13,000-15,000 BTU/lb; bituminous 10,500-14,000 BTU/lb per ASTM D388 classification; sub-bituminous 8,500-13,000 BTU/lb; lignite 4,000-8,300 BTU/lb. Saturated liquid water at 70°F: h_f ≈ 38.1 BTU/lb; saturated steam at 14.7 psia: h_g ≈ 1,150.5 BTU/lb. Refrigerant enthalpy/entropy tables in US-edition ASHRAE Handbook and US-customary printings of Mollier h-s diagrams use BTU/lb throughout. Convert BTU/lb to kJ/kg by multiplying by 2.326.
Quick Facts
- 1 Foot-Pound per Pound equals 0.00128507 BTU per Pound
- 1 BTU per Pound equals 778.168 Foot-Pounds per Pound
- Foot-Pound per Pound is a unit of specific energy
- BTU per Pound is a unit of specific energy
- This conversion is commonly used in fuel comparison, battery technology, and rocket propulsion
- The Foot-Pound per Pound belongs to the imperial system
Common Foot-Pound per Pound to BTU per Pound Conversions
| Foot-Pounds per Pound (ft·lbf/lb) | BTU per Pound (BTU/lb) |
|---|---|
| 0.01 | 0.0000128507 |
| 0.1 | 0.000128507 |
| 0.25 | 0.000321267 |
| 0.5 | 0.000642534 |
| 1 | 0.00128507 |
| 2 | 0.00257014 |
| 3 | 0.00385521 |
| 5 | 0.00642534 |
| 10 | 0.0128507 |
| 15 | 0.019276 |
| 20 | 0.0257014 |
| 25 | 0.0321267 |
| 50 | 0.0642534 |
| 75 | 0.0963802 |
| 100 | 0.128507 |
| 250 | 0.321267 |
| 500 | 0.642534 |
| 1000 | 1.28507 |
| 5000 | 6.42534 |
| 10000 | 12.8507 |
Understanding Foot-Pounds per Pound
The Foot-Pound per Pound (symbol: ft·lbf/lb) is a unit of specific energy. An imperial specific-energy unit equal to approximately 2.98907 J/kg (1 ft·lbf = 1.35582 J; 1 lb = 0.45359237 kg; ratio = 2.98907). ft·lbf/lb is a niche US-engineering unit used primarily in: ballistic kinetic-energy-per-mass calculations (E_k/m for projectiles, where US ballistics literature historically uses imperial mass for the projectile and ft·lbf for muzzle energy — a .308 Winchester 168gr bullet at 2,650 fps muzzle velocity has specific energy ~109,000 ft·lbf/lb), US-edition mechanical-engineering textbooks for mechanical strain-energy-per-mass calculations (Shigley, Norton, Hibbeler in dual-unit editions), and head-loss / hydraulic-energy specific calculations in US civil-engineering hydraulics where the natural unit is feet-of-head (1 ft of head of water ≈ 1 ft·lbf/lb specific gravitational potential). For typical engineering specific-energy scales (gasoline, batteries, structural-strain energy), the ft·lbf/lb numerical value is large and unwieldy — gasoline LHV is ~15.5 million ft·lbf/lb — so US engineers usually convert to BTU/lb for fuel work and reserve ft·lbf/lb for kinetic and elastic-strain applications. Convert ft·lbf/lb to J/kg by multiplying by 2.98907.
It belongs to the imperial measurement system.
Foot-Pounds per Pound are commonly used in fuel comparison, battery technology, and rocket propulsion.
Understanding BTU per Pound
The BTU per Pound (symbol: BTU/lb) is a unit of specific energy. An imperial specific-energy unit equal to exactly 2,326 J/kg (1 BTU/lb = 1,055.06 J / 0.45359237 kg = 2,326.000 J/kg). BTU/lb is dominant on US steam tables, HVAC enthalpy/psychrometric calculations per ASHRAE Handbook Fundamentals chapter 1, heating-fuel and refining specific-energy reporting per API MPMS and GPSA Engineering Data Book, and natural-gas heating-value certification. Reference values: natural gas heating value (residential pipeline grade) ~22,000 BTU/lb HHV (higher heating value with water-vapor condensation credit); LNG 21,500 BTU/lb; #2 fuel oil ~19,500 BTU/lb; gasoline 19,500-20,000 BTU/lb LHV; coal anthracite 13,000-15,000 BTU/lb; bituminous 10,500-14,000 BTU/lb per ASTM D388 classification; sub-bituminous 8,500-13,000 BTU/lb; lignite 4,000-8,300 BTU/lb. Saturated liquid water at 70°F: h_f ≈ 38.1 BTU/lb; saturated steam at 14.7 psia: h_g ≈ 1,150.5 BTU/lb. Refrigerant enthalpy/entropy tables in US-edition ASHRAE Handbook and US-customary printings of Mollier h-s diagrams use BTU/lb throughout. Convert BTU/lb to kJ/kg by multiplying by 2.326.
It belongs to the imperial measurement system.
BTU per Pound are commonly used in fuel comparison, battery technology, and rocket propulsion.
Why Convert Foot-Pounds per Pound to BTU per Pound?
Converting between Foot-Pounds per Pound and BTU per Pound is a frequent requirement for engineers, scientists, and students working with specific energy values. Different industries and regions favour different unit systems, so having a dependable conversion tool saves time and prevents errors in technical calculations. Whether you are verifying a specification sheet, cross-checking simulation results, or preparing a report for an international audience, accurate specific energy conversion is essential.
Frequently Asked Questions
How do I convert Foot-Pounds per Pound to BTU per Pound?
An imperial specific-energy unit equal to approximately 2. To convert Foot-Pounds per Pound to BTU per Pound, multiply by 0.00128507. For example, 25 ft·lbf/lb equals 0.0321267 BTU/lb.
How many BTU per Pound are in 1 Foot-Pound per Pound?
There are 0.00128507 BTU per Pound in 1 Foot-Pound per Pound.
How many Foot-Pounds per Pound are in 1 BTU per Pound?
There are 778.168 Foot-Pounds per Pound in 1 BTU per Pound.
What is the formula for Foot-Pound per Pound to BTU per Pound conversion?
The formula is: multiply by 0.00128507. This means 1 ft·lbf/lb = 0.00128507 BTU/lb.
Is a Foot-Pound per Pound bigger than a BTU per Pound?
Yes. One Foot-Pound per Pound is larger than one BTU per Pound because 1 ft·lbf/lb equals 0.00128507 BTU/lb, which is less than 1.
When do you need to convert between Foot-Pounds per Pound and BTU per Pound?
An imperial specific-energy unit equal to exactly 2,326 J/kg (1 BTU/lb = 1,055. Foot-Pound per Pound and BTU per Pound are both specific energy units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.