| 1 ftlb | = 0.0012794737984467 BTU39°F |
| 2 ftlb | = 0.0025589475968934 BTU39°F |
| 3 ftlb | = 0.0038384213953401 BTU39°F |
| 4 ftlb | = 0.0051178951937867 BTU39°F |
| 5 ftlb | = 0.0063973689922334 BTU39°F |
| 6 ftlb | = 0.0076768427906801 BTU39°F |
| 7 ftlb | = 0.0089563165891268 BTU39°F |
| 8 ftlb | = 0.010235790387573 BTU39°F |
| 9 ftlb | = 0.01151526418602 BTU39°F |
| 10 ftlb | = 0.012794737984467 BTU39°F |
| 20 ftlb | = 0.025589475968934 BTU39°F |
| 30 ftlb | = 0.038384213953401 BTU39°F |
| 40 ftlb | = 0.051178951937867 BTU39°F |
| 50 ftlb | = 0.063973689922334 BTU39°F |
| 60 ftlb | = 0.076768427906801 BTU39°F |
| 70 ftlb | = 0.089563165891268 BTU39°F |
| 80 ftlb | = 0.10235790387573 BTU39°F |
| 90 ftlb | = 0.1151526418602 BTU39°F |
| 100 ftlb | = 0.12794737984467 BTU39°F |
| 200 ftlb | = 0.25589475968934 BTU39°F |
| 300 ftlb | = 0.38384213953401 BTU39°F |
| 400 ftlb | = 0.51178951937867 BTU39°F |
| 500 ftlb | = 0.63973689922334 BTU39°F |
| 600 ftlb | = 0.76768427906801 BTU39°F |
| 700 ftlb | = 0.89563165891268 BTU39°F |
| 800 ftlb | = 1.0235790387573 BTU39°F |
| 900 ftlb | = 1.151526418602 BTU39°F |
| 1000 ftlb | = 1.2794737984467 BTU39°F |
| 2000 ftlb | = 2.5589475968934 BTU39°F |
| 4000 ftlb | = 5.1178951937867 BTU39°F |
| 5000 ftlb | = 6.3973689922334 BTU39°F |
| 7500 ftlb | = 9.5960534883501 BTU39°F |
| 10000 ftlb | = 12.794737984467 BTU39°F |
| 25000 ftlb | = 31.986844961167 BTU39°F |
| 50000 ftlb | = 63.973689922334 BTU39°F |
| 100000 ftlb | = 127.94737984467 BTU39°F |
| 1000000 ftlb | = 1279.4737984467 BTU39°F |
| 1000000000 ftlb | = 1279473.7984467 BTU39°F |