Foot-pound per Second to BTU per Hour (IT) Converter
Power · unit-converter
Convert Foot-pound per Second to BTU per Hour (IT) with a fixed input and output unit, step-by-step formula line, and reference tables. Linear units use SI watt definitions; mechanical hp uses 550 ft·lbf/s; BTU/h uses the IT BTU; dBm/dBW are logarithmic relative to 1 mW and 1 W. The full Power Converter also includes PS/CV, TR, kVA/MVA, and ft·lb/s.
Calculator
From: Foot-pound per Second (ft_lb_s)
To: BTU per Hour (IT) (btu_hr)
About Foot-pound per Second
Foot-pounds per second is a mechanical power rate: 1 ft·lb/s = 1.3558179483314004 W (exactly, from the international foot definition).
About BTU per Hour (IT)
BTU per hour expresses thermal power using the IT British thermal unit (≈ 1,055.056 J per BTU), divided by one hour. Common in HVAC equipment ratings.
How to convert foot-pounds per second to btu per hour (it)
1 foot-pound per second is equal to 4.62624286844368 btu per hour (it) when both are expressed in watt-equivalents:
1 ft_lb_s = (1.3558179483314003 W ÷ 0.2930710701722222 W) btu_hr = 4.62624286844368 btu_hr
Each foot-pound per second is defined as 1.3558179483314003 W and each btu per hour (it) as 0.2930710701722222 W in this tool, so one ft_lb_s equals 1.3558179483314003 ÷ 0.2930710701722222 btu_hr = 4.62624286844368 btu_hr.
Let d(ft_lb_s) be the numeric value in Foot-pound per Second (ft_lb_s), and d(btu_hr) the value in BTU per Hour (IT) (btu_hr). Then:
d(btu_hr) = d(ft_lb_s) × (1.3558179483314003 / 0.2930710701722222)
Equivalently, divide by how many ft_lb_s fit into one btu_hr (watts per btu_hr divided by watts per ft_lb_s):
d(btu_hr) = d(ft_lb_s) ÷ 0.21615812840721
Or: btu per hour (it) = foot-pound per second ÷ 0.21615812840721
Examples
Example #1: Convert 1 ft_lb_s to btu per hour (it)
1 ft_lb_s = 1 ft_lb_s × (1.3558179483314003/0.2930710701722222) btu_hr = 4.6262428684 btu_hr
1 ft_lb_s = 1 ft_lb_s ÷ 0.21615812840721 = 4.6262428684 btu_hr
Intermediate watts: 1.3558179483 W
Example #2: Convert 10 ft_lb_s to btu per hour (it)
10 ft_lb_s = 10 ft_lb_s × (1.3558179483314003/0.2930710701722222) btu_hr = 46.2624286844 btu_hr
10 ft_lb_s = 10 ft_lb_s ÷ 0.21615812840721 = 46.2624286844 btu_hr
Intermediate watts: 13.5581794833 W
Summary
To convert Foot-pound per Second to BTU per Hour (IT), multiply the value in ft_lb_s by the ratio of watts per ft_lb_s divided by watts per btu_hr. Equivalently: value_btu_hr = value_ft_lb_s × (1.3558179483314003 / 0.2930710701722222). Numerically, 1 ft_lb_s equals 4.62624286844368 btu_hr.
Relationship context
You are converting between mechanical power (horsepower, ft·lb/s) (Foot-pounds per Second) and thermal engineering rates (BTU/h, kcal/h) (BTU per Hour (IT)). All linear values are mapped through watts first. The numeric factor is 4.626243e+0.
Conversion tables
| Foot-pound per Second (ft_lb_s) | BTU per Hour (IT) (btu_hr) |
|---|---|
| 0.1 | 0.4626242868 |
| 1 | 4.6262428684 |
| 2 | 9.2524857369 |
| 3 | 13.8787286053 |
| 4 | 18.5049714738 |
| 5 | 23.1312143422 |
| 6 | 27.7574572107 |
| 7 | 32.3837000791 |
| 8 | 37.0099429475 |
| 9 | 41.636185816 |
| Foot-pound per Second (ft_lb_s) | BTU per Hour (IT) (btu_hr) |
|---|---|
| 10 | 46.2624286844 |
| 20 | 92.5248573689 |
| 30 | 138.787286053 |
| 40 | 185.049714738 |
| 50 | 231.312143422 |
| 60 | 277.574572107 |
| 70 | 323.837000791 |
| 80 | 370.099429475 |
| 90 | 416.36185816 |
| 100 | 462.624286844 |