Convert BTU per Pound to Foot-Pounds per Pound
Instantly convert BTU per Pound (BTU/lb) to Foot-Pounds per Pound (ft·lbf/lb) with our free online calculator.
Formula: BTU/lb to ft·lbf/lb — multiply by 778.168
Reference Table
| BTU per Pound (BTU/lb) | Foot-Pounds per Pound (ft·lbf/lb) |
|---|---|
| 1 | 778.168 |
| 5 | 3890.84 |
| 10 | 7781.68 |
| 25 | 19454.2 |
| 50 | 38908.4 |
| 100 | 77816.8 |
How to Convert BTU per Pound to Foot-Pounds per Pound
Formula
To convert BTU per Pound (BTU/lb) to Foot-Pounds per Pound (ft·lbf/lb): multiply by 778.168
Step-by-Step
- Start with your value in BTU per Pound (BTU/lb).
- Multiply by 778.168 to perform the conversion.
- The result is your value expressed in Foot-Pounds per Pound (ft·lbf/lb).
Conversion Factor
1 BTU/lb = 778.168 ft·lbf/lb
Reverse Factor
1 ft·lbf/lb = 0.00128507 BTU/lb
Worked Example
Convert 25 BTU per Pound to Foot-Pounds per Pound: 25 BTU/lb = 19454.2 ft·lbf/lb
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.
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.
Quick Facts
- 1 BTU per Pound equals 778.168 Foot-Pounds per Pound
- 1 Foot-Pound per Pound equals 0.00128507 BTU per Pound
- BTU per Pound is a unit of specific energy
- Foot-Pound per Pound is a unit of specific energy
- This conversion is commonly used in fuel comparison, battery technology, and rocket propulsion
- The BTU per Pound belongs to the imperial system
Common BTU per Pound to Foot-Pound per Pound Conversions
| BTU per Pound (BTU/lb) | Foot-Pounds per Pound (ft·lbf/lb) |
|---|---|
| 0.01 | 7.78168 |
| 0.1 | 77.8168 |
| 0.25 | 194.542 |
| 0.5 | 389.084 |
| 1 | 778.168 |
| 2 | 1556.34 |
| 3 | 2334.51 |
| 5 | 3890.84 |
| 10 | 7781.68 |
| 15 | 11672.5 |
| 20 | 15563.4 |
| 25 | 19454.2 |
| 50 | 38908.4 |
| 75 | 58362.6 |
| 100 | 77816.8 |
| 250 | 194542 |
| 500 | 389084 |
| 1000 | 778168 |
| 5000 | 3890840 |
| 10000 | 7781680 |
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.
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.
Why Convert BTU per Pound to Foot-Pounds per Pound?
Converting between BTU per Pound and Foot-Pounds 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 BTU per Pound to Foot-Pounds per Pound?
An imperial specific-energy unit equal to exactly 2,326 J/kg (1 BTU/lb = 1,055. To convert BTU per Pound to Foot-Pounds per Pound, multiply by 778.168. For example, 25 BTU/lb equals 19454.2 ft·lbf/lb.
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.
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.
What is the formula for BTU per Pound to Foot-Pound per Pound conversion?
The formula is: multiply by 778.168. This means 1 BTU/lb = 778.168 ft·lbf/lb.
Is a BTU per Pound bigger than a Foot-Pound per Pound?
No. One BTU per Pound is smaller than one Foot-Pound per Pound because 1 BTU/lb equals 778.168 ft·lbf/lb, which is greater than 1.
When do you need to convert between BTU per Pound and Foot-Pounds per Pound?
An imperial specific-energy unit equal to approximately 2. BTU per Pound and Foot-Pound 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.