Convert Foot-Pound-Force to Therms
Convert Foot-Pound-Force (ft·lbf) to Therms (thm) instantly and accurately.
Conversion Formula
thm = ft·lbf × 1.285067463e-8
About Foot-Pound-Force
A foot-pound-force (ft·lbf) is the work done by one pound-force through one foot - exactly 1.3558179483314004 J. It is the standard torque and energy unit in US engineering. Automotive engine torque: Honda Civic ~125 lb-ft; Ford F-150 EcoBoost ~500 lb-ft. Muzzle energies: .22 LR ~140 ft·lbf; .308 Winchester ~2,600 ft·lbf; .50 BMG ~14,000 ft·lbf. Diesel pile hammers deliver 15,000-600,000 ft·lbf/blow. SAE Grade 8 bolts are specified at 7-950 ft·lbf. 1 ft·lbf = 12 in·lbf = 1.35582 J = 0.32405 cal.
About Therms
A therm is the US natural gas billing unit equal to exactly 100,000 BTU = 105,505,585.262 J ≈ 105.5 MJ. One CCF of average US pipeline gas contains ~1.02 therms. The EIA publishes residential gas prices in $/therm; spot prices at Henry Hub are in $/MMBTU (1 MMBTU = 10 therms). US households average 500-700 therms/year for space heating, water heating, and cooking. A 15 kW domestic boiler running 2 hours delivers ~1 therm of useful heat. 1 therm = 100,000 BTU = 105.506 MJ = 29.307 kWh = 25,200 kcal.
Quick Reference Table
| Foot-Pound-Force (ft·lbf) | Therms (thm) |
|---|---|
| 1 ft·lbf | 1.285 × 10-8 thm |
| 2 ft·lbf | 2.57 × 10-8 thm |
| 5 ft·lbf | 6.425 × 10-8 thm |
| 10 ft·lbf | 1.285 × 10-7 thm |
| 25 ft·lbf | 3.213 × 10-7 thm |
| 50 ft·lbf | 6.425 × 10-7 thm |
| 100 ft·lbf | 1.285 × 10-6 thm |