ft·lbf to BTU — convert foot-pounds to British thermal units
Exact 1 ÷ 778.169262 = 0.001285067463
1 foot-pound in other units
| Joules | 1.355818 | J |
|---|---|---|
| Kilojoules | 0.001355817948 | kJ |
| Megajoules | 0.000001355818 | MJ |
| Watt-hours | 0.000376616097 | Wh |
| Kilowatt-hours | 3.7662e-7 | kWh |
| Calories | 0.32404827 | cal |
| Kilocalories | 0.000324048267 | kcal |
| British thermal units | 0.001285067463 | BTU |
| Therms | 1.2851e-8 | thm |
| Electronvolts | 8,462,350,027,827,209,216 | eV |
ft·lbf to BTU at a glance
| Foot-pounds | British thermal units |
|---|---|
| 1 ft·lbf | 0.001285067463 BTU |
| 2 ft·lbf | 0.002570134927 BTU |
| 3 ft·lbf | 0.00385520239 BTU |
| 5 ft·lbf | 0.006425337317 BTU |
| 10 ft·lbf | 0.01285067 BTU |
| 20 ft·lbf | 0.02570135 BTU |
| 25 ft·lbf | 0.03212669 BTU |
| 50 ft·lbf | 0.06425337 BTU |
| 100 ft·lbf | 0.12850675 BTU |
| 250 ft·lbf | 0.32126687 BTU |
| 500 ft·lbf | 0.64253373 BTU |
| 1,000 ft·lbf | 1.285067 BTU |
How to convert foot-pounds to British thermal units
Multiply by 0.001285067463 — one foot-pound is 0.001285067463 British thermal units. That factor is exact: it comes from the definition of the units rather than from a measurement, so it will not change and does not need rounding.
Working 1 ÷ 778.169262 = 0.001285067463
Questions
How many British thermal units are in a foot-pound?
One foot-pound is 0.001285067463 British thermal units. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 1 foot-pound in British thermal units?
1 foot-pound is 0.001285067463 British thermal units. The working is 1 ÷ 778.169262 = 0.001285067463.
Is a food Calorie the same as a calorie?
No — it is a thousand of them. The Calorie on a nutrition label is a kilocalorie, written with a capital C in principle and almost never in practice. A 250 Calorie chocolate bar holds 250,000 physics calories, or about 1,046 kilojoules, which is why European labels quote kJ alongside.
What does a kilowatt-hour actually represent?
One kilowatt drawn for one hour — a 1,000 W heater running for sixty minutes, or a 100 W bulb for ten hours. It is the unit your electricity bill is priced in, and it equals exactly 3.6 million joules.
How much energy is one BTU?
Roughly the heat needed to raise one pound of water by one degree Fahrenheit — about 1,055 joules, or the energy in a single kitchen match. Air conditioners are rated in BTU per hour, where a 12,000 BTU/h unit is one "ton" of cooling and draws around 3.5 kW of heat.
Why is the electronvolt so small?
Because it is sized for single particles: it is the energy one electron picks up crossing a one-volt potential difference. At about 1.6 × 10⁻¹⁹ joules it would be absurd for anything larger, which is precisely why particle physics uses it instead of dragging around twenty leading zeros.