Feet-Pound to British Thermal Unit Converter
Energy · unit-converter
Convert Feet-Pound to British Thermal Unit with fixed input and output units, a step-by-step formula line, and reference tables. Factors are joule-based; food energy uses thermochemical calories. The full Energy Converter also includes MMBtu, toe, thermal kWh, and MeV/GeV.
Calculator
From: Feet-Pound (ftlb)
To: British Thermal Unit (btu)
About Feet-Pound
The feet-pound is a mechanical work unit common in US torque and ballistics contexts.
About British Thermal Unit
The British thermal unit used here is the IT BTU: ≈ 1,055.056 J. It appears in HVAC, heating equipment, and US engineering data.
How to convert feet-pounds to british thermal units
1 feet-pound is equal to 0.00128506746346 british thermal unit when both are expressed in joule-equivalents:
1 ftlb = (1.3558179483314003 J ÷ 1,055.05585262 J) btu = 0.00128506746346 btu
Each feet-pound is defined as 1.3558179483314003 J and each british thermal unit as 1,055.05585262 J in this tool, so one ftlb equals 1.3558179483314003 ÷ 1,055.05585262 btu = 0.00128506746346 btu.
Let d(ftlb) be the numeric amount in Feet-Pound (ftlb), and d(btu) the amount in British Thermal Unit (btu). Then:
d(btu) = d(ftlb) × (1.3558179483314003 / 1,055.05585262)
Equivalently, divide by how many ftlb fit into one btu (joules per btu divided by joules per ftlb):
d(btu) = d(ftlb) ÷ 778.1692622659649
Or: british thermal unit = feet-pound ÷ 778.1692622659649
Examples
Example #1: Convert 1 ftlb to british thermal unit
1 ftlb = 1 ftlb × (1.3558179483314003/1,055.05585262) btu = 0.0012850675 btu
1 ftlb = 1 ftlb ÷ 778.1692622659649 = 0.0012850675 btu
Example #2: Convert 10 ftlb to british thermal unit
10 ftlb = 10 ftlb × (1.3558179483314003/1,055.05585262) btu = 0.0128506746 btu
10 ftlb = 10 ftlb ÷ 778.1692622659649 = 0.0128506746 btu
Summary
To convert Feet-Pound to British Thermal Unit, multiply the value in ftlb by the ratio of joules per ftlb divided by joules per btu. Equivalently: value_btu = value_ftlb × (1.3558179483314003 / 1055.05585262). Numerically, 1 ftlb equals 0.0012850674634565778 btu.
Relationship context
Both units are US / imperial engineering units (BTU, therm, ft·lb). Conversions use fixed joule factors, so results stay consistent with the definitions in this converter. The factor from Feet-Pound to British Thermal Unit is 1.285067e-3 (1 ftlb = 0.0012850674634565778 btu).
Conversion tables
| Feet-Pound (ftlb) | British Thermal Unit (btu) |
|---|---|
| 0.1 | 0.0001285067 |
| 1 | 0.0012850675 |
| 2 | 0.0025701349 |
| 3 | 0.0038552024 |
| 4 | 0.0051402699 |
| 5 | 0.0064253373 |
| 6 | 0.0077104048 |
| 7 | 0.0089954722 |
| 8 | 0.0102805397 |
| 9 | 0.0115656072 |
| Feet-Pound (ftlb) | British Thermal Unit (btu) |
|---|---|
| 10 | 0.0128506746 |
| 20 | 0.0257013493 |
| 30 | 0.0385520239 |
| 40 | 0.0514026985 |
| 50 | 0.0642533732 |
| 60 | 0.0771040478 |
| 70 | 0.0899547224 |
| 80 | 0.1028053971 |
| 90 | 0.1156560717 |
| 100 | 0.1285067463 |