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Unit Conversion & Everyday Life

Power Converter

Convert power between watts, kilowatts, horsepower (mechanical and metric), BTU per hour and tons of refrigeration.

Your inputs

Results

150 hp in kW

111.854980737 kW

Conversion type
Exact (from defined constants; display rounded to 12 significant figures)
1 hp =
0.745699871582 kW

✓Exact calculation — rounded only for display

150 hp in all power units11 rows
UnitValue
Milliwatt (mW)111,854,980.737
Watt (W)111,854.980737
Kilowatt (kW)111.854980737
Megawatt (MW)0.1118549807
Gigawatt (GW)0.000111855
Horsepower (mechanical, 550 ft·lbf/s) (hp)150
Metric horsepower (PS) (PS)152.080449814
BTU per hour (BTU/h)381,665.036647
Kilocalorie per hour (kcal/h)96,242.3352425
Foot-pound force per second (ft·lbf/s)82,500
Ton of refrigeration (12,000 BTU/h) (TR)31.8054197206

What this calculator does

Compare engines, motors, heaters and air conditioners rated in different units.

Formula and method

1 hp (mechanical) = 550 ft·lbf/s ≈ 745.70 W; 1 PS = 735.49875 W; 1 ton of refrigeration = 12,000 BTU/h

Worked example

Calculated by this tool with its default inputs:

Inputs

  • Value: 150
  • From: Horsepower (mechanical, 550 ft·lbf/s) (hp)
  • To: Kilowatt (kW)

Results

  • 150 hp in kW: 111.854980737 kW
  • Conversion type: Exact (from defined constants; display rounded to 12 significant figures)
  • 1 hp =: 0.745699871582 kW

How to read the results

Mechanical and metric horsepower differ by about 1.4 %.

Assumptions and limitations

  • Constants follow NIST SP 811 and the SI Brochure. Conversions marked exact follow from defined values; display is rounded to 12 significant figures.

Questions

What is a kW in horsepower?

About 1.341 mechanical hp.

Sources

Methodology and verification

Result type
Exact mathematical calculation (rounded only for display)
Formula version
1.0
Automated verification
8 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
Editorial review
Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.

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