How this calculator works
Power measures energy per time, not total energy. Horsepower here means mechanical horsepower (550 foot-pounds-force per second), not metric horsepower. BTU/hour uses the International Table BTU.
The formula
Base amount = value × source factor
Target amount = base amount / target factorA quick example
1 kW = 1,000 W; 1 mechanical hp is approximately 745.699872 W.
How to use this calculator
- Enter a value using a decimal point.
- Choose the source and target units.
- Read the live result or swap units to reverse the direction.
A few common questions
Which convention does this converter use?
Power measures energy per time, not total energy. Horsepower here means mechanical horsepower (550 foot-pounds-force per second), not metric horsepower. BTU/hour uses the International Table BTU.
Can I reverse the conversion?
Yes. Swap exchanges the units, keeps your input amount and calculates again.
Why is the displayed result rounded?
The calculation uses the full stored factor. Results show up to six decimal places, with scientific notation for very small or large amounts.
Reference: NIST conversion factors