British Thermal Units to Foot-pounds Force Converter
1 British thermal unit ≈ 778.169262 foot-pounds force
Several BTU definitions exist. This converter uses the International Table BTU, the one used by HVAC equipment ratings.
Energy and torque share these dimensions. For fastener torque see the Torque category, where the same quantity is written lbf·ft.
1 British thermal unit equals 778.169 foot-pounds force
How to convert British thermal units to foot-pounds force
Calories here are thermochemical (4.184 J), while BTU uses the International Table definition. A kilowatt-hour is energy (3.6 MJ), not power; a food Calorie is a kilocalorie.
ft·lbf = BTU × 778.1692623One British thermal unit is 778.1692623 foot-pounds force, so a single multiplication converts any value.
7,781.69 ft·lbf ≈ 10 × 778.1692623Several BTU definitions exist. This converter uses the International Table BTU, the one used by HVAC equipment ratings.
Energy and torque share these dimensions. For fastener torque see the Torque category, where the same quantity is written lbf·ft.
British thermal units to foot-pounds force conversion table
Common values in British thermal units, converted to foot-pounds force.
| British thermal units (BTU) | Foot-pounds force (ft·lbf) |
|---|---|
| 1 | 778.16926 |
| 2 | 1,556.3385 |
| 3 | 2,334.5078 |
| 4 | 3,112.677 |
| 5 | 3,890.8463 |
| 10 | 7,781.6926 |
| 20 | 15,563.385 |
| 25 | 19,454.232 |
| 50 | 38,908.463 |
| 100 | 77,816.926 |
| 250 | 194,542.32 |
| 500 | 389,084.63 |
| 1,000 | 778,169.26 |
About these units
British thermal unitBTU
The International Table BTU: 1,055.05585262 joules. The US heating and cooling unit.
Reference: NIST Special Publication 811.
foot-pound forceft·lbf
The work done by one pound-force acting through one foot.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.