BTU per Hour (IT) to Foot-pound per Second Converter
Power · unit-converter
Convert BTU per Hour (IT) to Foot-pound per Second 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: BTU per Hour (IT) (btu_hr)
To: Foot-pound per Second (ft_lb_s)
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.
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).
How to convert btu per hour (it) to foot-pounds per second
1 btu per hour (it) is equal to 0.21615812840721 foot-pound per second when both are expressed in watt-equivalents:
1 btu_hr = (0.2930710701722222 W ÷ 1.3558179483314003 W) ft_lb_s = 0.21615812840721 ft_lb_s
Each btu per hour (it) is defined as 0.2930710701722222 W and each foot-pound per second as 1.3558179483314003 W in this tool, so one btu_hr equals 0.2930710701722222 ÷ 1.3558179483314003 ft_lb_s = 0.21615812840721 ft_lb_s.
Let d(btu_hr) be the numeric value in BTU per Hour (IT) (btu_hr), and d(ft_lb_s) the value in Foot-pound per Second (ft_lb_s). Then:
d(ft_lb_s) = d(btu_hr) × (0.2930710701722222 / 1.3558179483314003)
Equivalently, divide by how many btu_hr fit into one ft_lb_s (watts per ft_lb_s divided by watts per btu_hr):
d(ft_lb_s) = d(btu_hr) ÷ 4.62624286844368
Or: foot-pound per second = btu per hour (it) ÷ 4.62624286844368
Examples
Example #1: Convert 1 btu_hr to foot-pound per second
1 btu_hr = 1 btu_hr × (0.2930710701722222/1.3558179483314003) ft_lb_s = 0.2161581284 ft_lb_s
1 btu_hr = 1 btu_hr ÷ 4.62624286844368 = 0.2161581284 ft_lb_s
Intermediate watts: 0.2930710702 W
Example #2: Convert 10 btu_hr to foot-pound per second
10 btu_hr = 10 btu_hr × (0.2930710701722222/1.3558179483314003) ft_lb_s = 2.1615812841 ft_lb_s
10 btu_hr = 10 btu_hr ÷ 4.62624286844368 = 2.1615812841 ft_lb_s
Intermediate watts: 2.9307107017 W
Summary
To convert BTU per Hour (IT) to Foot-pound per Second, multiply the value in btu_hr by the ratio of watts per btu_hr divided by watts per ft_lb_s. Equivalently: value_ft_lb_s = value_btu_hr × (0.2930710701722222 / 1.3558179483314003). Numerically, 1 btu_hr equals 0.2161581284072125 ft_lb_s.
Relationship context
You are converting between thermal engineering rates (BTU/h, kcal/h) (BTU per Hour (IT)) and mechanical power (horsepower, ft·lb/s) (Foot-pounds per Second). All linear values are mapped through watts first. The numeric factor is 2.161581e-1.
Conversion tables
| BTU per Hour (IT) (btu_hr) | Foot-pound per Second (ft_lb_s) |
|---|---|
| 0.1 | 0.0216158128 |
| 1 | 0.2161581284 |
| 2 | 0.4323162568 |
| 3 | 0.6484743852 |
| 4 | 0.8646325136 |
| 5 | 1.080790642 |
| 6 | 1.2969487704 |
| 7 | 1.5131068989 |
| 8 | 1.7292650273 |
| 9 | 1.9454231557 |
| BTU per Hour (IT) (btu_hr) | Foot-pound per Second (ft_lb_s) |
|---|---|
| 10 | 2.1615812841 |
| 20 | 4.3231625681 |
| 30 | 6.4847438522 |
| 40 | 8.6463251363 |
| 50 | 10.8079064204 |
| 60 | 12.9694877044 |
| 70 | 15.1310689885 |
| 80 | 17.2926502726 |
| 90 | 19.4542315566 |
| 100 | 21.6158128407 |