Mechanical power rate.
Foot-pounds per second to BTU per hour Converter — ft-lb/s to BTU/h
Convert Foot-pound per second (ft-lb/s) to BTU per hour (BTU/h) using the exact conversion factor (1 foot-pound per second = 4.626242868 btu per hour). See the formula, worked examples, and conversion table.
Foot-pounds per second to BTU per hour converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Power rate using BTU per hour.
Result = input x 1.355817948 / 0.2930710702.
Power units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Foot-pounds per second to BTU per hour
Foot-pound per second and BTU per hour both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Mechanical power rate, and power rate using BTU per hour.
Formula
btu per hour = foot-pounds per second × 4.62624286844
This factor comes from each unit's defined relationship to the category's base unit: 1 foot-pound per second equals 1.35581794833 base units, and 1 btu per hour equals 0.293071070172 base units, so dividing one by the other gives the direct foot-pound per second-to-btu per hour factor of 4.62624286844.
Simple example
1 ft-lb/s × 4.626242868 = 4.626242868 BTU/h
1 foot-pound per second = 4.626242868 btu per hour.
Real-world example
100 ft-lb/s × 4.626242868 = 462.6242868 BTU/h
100 foot-pounds per second = 462.6242868 btu per hour.
Conversion table
| Foot-pound per second (ft-lb/s) | BTU per hour (BTU/h) |
|---|---|
| 1 ft-lb/s | 4.626242868 BTU/h |
| 10 ft-lb/s | 46.26242868 BTU/h |
| 50 ft-lb/s | 231.3121434 BTU/h |
| 100 ft-lb/s | 462.6242868 BTU/h |
| 500 ft-lb/s | 2,313.121434 BTU/h |
| 1,000 ft-lb/s | 4,626.242868 BTU/h |
Reverse conversion: BTU per hour to Foot-pound per second
4.626242868 BTU/h × 0.2161581284 = 0.9999999999 ft-lb/s
4.626242868 btu per hour = 0.9999999999 foot-pounds per second.
foot-pounds per second = btu per hour × 0.216158128407
For a page dedicated to this direction, see BTU per hour to Foot-pound per second.
Understanding the Foot-pound per second (ft-lb/s)
Mechanical power rate.
Understanding the BTU per hour (BTU/h)
Power rate using BTU per hour.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many btu per hour are in 1 foot-pound per second?
1 foot-pound per second equals 4.626242868 btu per hour, using the exact defined conversion factor rather than an estimate.
How do I convert foot-pound per second to btu per hour?
Multiply the foot-pound per second value by 4.626242868. The converter above does this instantly to whatever precision you set.
How do I convert btu per hour back to foot-pound per second?
Use the reverse factor: 1 btu per hour equals 0.2161581284 foot-pounds per second. You can also use the swap control in the converter above to flip the direction instantly.
What is a foot-pound per second?
Foot-pound per second (ft-lb/s) is a unit of engineering.
What is a btu per hour?
BTU per hour (BTU/h) is a unit of engineering.
Is the foot-pound per second to btu per hour conversion exact?
Yes. Both foot-pound per second and btu per hour are defined by fixed standards rather than physical artifacts, so the factor of 4.626242868 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.