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Power Converter Calculator

Work out power converter instantly with clear inputs, formula shown and shareable results.

About Power Converter Calculator

Each power unit is defined as a multiple of the watt, so the conversion runs in two steps: multiply by the source unit's factor to reach watt, then divide by the target unit's factor. One factor per unit covers every pair in the list.

Formulas

Two-step conversion

result = value × factor(from) ÷ factor(to)

Base value

base (watt) = value × factor(from)

Worked example

With the default values below, Power Converter Calculator returns Converted Value of 134.102209. Change any input above and every figure here is recalculated in your browser.

Inputs used

Value
100
From unitone of Watt (W), Kilowatt (kW), Megawatt (MW), Horsepower, mechanical (hp), Metric horsepower (PS), BTU per hour (BTU/h), Foot-pound per second (ft·lbf/s)
Kilowatt (kW)
To unitone of Watt (W), Kilowatt (kW), Megawatt (MW), Horsepower, mechanical (hp), Metric horsepower (PS), BTU per hour (BTU/h), Foot-pound per second (ft·lbf/s)
Horsepower, mechanical (hp)

Results

Converted Value
134.102209
Result Unit
Horsepower, mechanical (hp)
Value in watt (base)
100,000.000000
Multiplier Applied
1.34102209

Step by step

  1. 1Values used
  2. 2Two-step conversion
  3. 3Base value
  4. 4Converted Value= 134.102209
  5. 5Result Unit= Horsepower, mechanical (hp)
  6. 6Value in watt (base)= 100,000.000000
  7. 7Multiplier Applied= 1.34102209

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 8 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why route through watt?

With 7 units, direct pairs would mean 42 factors to maintain. Going via watt needs one factor per unit and gives the same answer.

Does the dropdown order matter?

Yes. The first is the unit your figure is already in; the second is what you want it in. Swapping them inverts the result.

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