Convert foot-pound to British thermal unit
1 ft⋅lb = 0.001285067463 BTU
1 ft⋅lb = 0.0012851 BTU
1 ft⋅lb in every energy unit
| electron volt | 8.4624e+18 eV |
| hartree | 3.1099e+17 Eh |
| kiloelectron volt | 8.4624e+15 keV |
| megaelectron volt | 8,462,400,000,000 MeV |
| gigaelectron volt | 8,462,400,000 GeV |
| nanojoule | 1,355,800,000 nJ |
| erg | 13,558,000 erg |
| teraelectron volt | 8,462,400 TeV |
| microjoule | 1,355,800 µJ |
| millijoule | 1,355.8 mJ |
| inch-pound | 12 in·lb |
| joule | 1.3558 J |
| foot-pound | 1 ft⋅lb |
| calorie | 0.32405 cal |
| calorie (International Table) | 0.32383 cal IT |
| kilojoule | 0.0013558 kJ |
| BTU (thermochemical) | 0.0012859 BTU th |
| British thermal unit | 0.0012851 BTU |
| watt-hour | 0.00037662 Wh |
| kilocalorie | 0.00032405 kcal |
| megajoule | 0.0000013558 MJ |
| horsepower-hour | 5.0505e-07 hp·h |
| kilowatt-hour | 3.7662e-07 kWh |
| therm | 1.2851e-08 therm |
| gigajoule | 1.3558e-09 GJ |
| million BTU | 1.2851e-09 MMBTU |
| megawatt-hour | 3.7662e-10 MWh |
| ton of TNT | 3.2405e-10 t TNT |
| tonne of oil equivalent | 3.2383e-11 toe |
| terajoule | 1.3558e-12 TJ |
| gigawatt-hour | 3.7662e-13 GWh |
| kiloton of TNT | 3.2405e-13 kt TNT |
| petajoule | 1.3558e-15 PJ |
| terawatt-hour | 3.7662e-16 TWh |
| megaton of TNT | 3.2405e-16 Mt TNT |
| quad | 1.2851e-18 quad |
How the conversion works
Multiply by 0.001285067463 to go from foot-pound to British thermal unit, or divide by it to go back. Every conversion on this site routes through the SI value (J) rather than a table of pairwise factors, so a round-trip returns exactly what you started with.
Going the other way? British thermal unit to foot-pound — 1 BTU = 778.1692623 ft⋅lb.
foot-pound to British thermal unit — common values
| 1 ft⋅lb | 0.0012850675 BTU |
| 2 ft⋅lb | 0.0025701349 BTU |
| 3 ft⋅lb | 0.0038552024 BTU |
| 5 ft⋅lb | 0.0064253373 BTU |
| 10 ft⋅lb | 0.012850675 BTU |
| 15 ft⋅lb | 0.019276012 BTU |
| 20 ft⋅lb | 0.025701349 BTU |
| 25 ft⋅lb | 0.032126687 BTU |
| 50 ft⋅lb | 0.064253373 BTU |
| 75 ft⋅lb | 0.09638006 BTU |
| 100 ft⋅lb | 0.12850675 BTU |
| 250 ft⋅lb | 0.32126687 BTU |
| 500 ft⋅lb | 0.64253373 BTU |
| 1000 ft⋅lb | 1.2850675 BTU |