W · kW · hp · BTU/h
Power Converter: W, kW, hp and BTU/h
Convert watts, kilowatts, horsepower and BTU/h with clear formulas. Compare power values, calculate energy over time and create your own conversion table.
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Choose the units and enter a value. Results update immediately. Decimal commas and scientific notation are accepted; do not use thousands separators. Signed values are allowed for conversion only. Horsepower types use different definitions; an output power rating is not automatically electrical input power.
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Converted power
All equivalent values
Formula and calculation
Custom conversion table
The table uses the source and destination units selected above. Enter a starting value, a positive step and 1–100 rows. Results can be copied or exported as CSV; display rounding does not change the conversion factors.
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Compare two power values
Both values are expressed in watts before comparison. Difference means B − A; percentage change is relative to A. If A is zero, a ratio and percentage change are undefined. No performance or efficiency ranking is inferred.
Configuration A
Configuration B
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Formula and calculation
Energy over time
At constant power, E = P × t. kW measures power; kWh measures energy. Enter nonnegative power and time. The line is a constant-power model, not a prediction of changing real-world consumption. When time is zero, energy is zero.
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Formula and calculation
Conversion factor
| Unit | W |
|---|---|
| 1 µW | 0.000001 |
| 1 mW | 0.001 |
| 1 W | 1 |
| 1 kW | 1000 |
| 1 MW | 1000000 |
| 1 GW | 1000000000 |
| 1 hp(I) · Mechanical horsepower | 745.699871582 |
| 1 PS · Metric horsepower (PS) | 735.49875 |
| 1 hp(E) · Electrical horsepower | 746 |
| 1 BTU_IT/h · British thermal units per hour (IT) | 0.293071070172 |
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