Power Unit Conversion Formula
To convert between arbitrary power units without loss of precision, this calculator uses the SI standard base unit of Watts (W) as an intermediate reference bridge:
Universal Power Conversion Formula
$$\text{Power in Watts} = \text{Value}_{\text{from}} \times \text{Factor}_{\text{from}}$$
$$\text{Result}_{\text{target}} = \frac{\text{Power in Watts}}{\text{Factor}_{\text{to}}}$$
Example (Convert 1 Megawatt to Watts):
$$\text{Watts} = 1\text{ MW} \times 1,000,000 = \mathbf{1,000,000\text{ W}}$$
Common Power Equivalents Reference Table
Quick lookup ratios comparing common mechanical, electrical, and thermal heating/cooling power scales:
| Unit Name | Watts (W) | Kilowatts (kW) | Horsepower (hp) | BTU/hour (BTU/h) |
|---|---|---|---|---|
| 1 Watt (W) | 1 W | 0.001 kW | 0.001341 hp | 3.41214 BTU/h |
| 1 Kilowatt (kW) | 1,000 W | 1 kW | 1.34102 hp | 3,412.14 BTU/h |
| 1 Horsepower (hp) | 745.7 W | 0.7457 kW | 1 hp | 2,544.43 BTU/h |
| 1 Megawatt (MW) | 1,000,000 W | 1,000 kW | 1,341.02 hp | 3,412,142 BTU/h |
| 12,000 BTU/h (1 Ton) | 3,516.85 W | 3.5169 kW | 4.7162 hp | 12,000 BTU/h |
About Power Measurements
Power measures how quickly energy is used or produced — mathematically expressed as energy divided by time. Watts and kilowatts serve as standard international units for electrical grids and appliances, mechanical horsepower rate motor outputs, and BTU/hour measures thermal heating or HVAC cooling capacity.
How to Use This Calculator
- Enter the numeric value you want to convert in the Value box.
- Select the originating unit from the From dropdown menu.
- Select the target output unit from the To dropdown menu.
- The calculated conversion updates dynamically in real time.
Frequently Asked Questions
How does the power converter work?
Enter a value, pick the unit you're converting from and the unit you want, and the result updates instantly using watts as the common reference point.
Are the conversion factors exact?
Most factors used here are the internationally defined exact values (such as 1 mechanical horsepower = 745.699872 watts). A small number of larger units carry rounding beyond several decimal places.
What's the base unit used internally?
This calculator converts every unit to watts first, then to your target unit, so any combination of supported units can be converted directly.
Can I convert a very small or very large number?
Yes, the calculator handles decimals and large numbers the same way — just type the value into the input field.