Power Conversion Calculator & Unit Converter
Instant Power Unit Conversion Calculator: Convert between Watts (W), Kilowatts (kW), Megawatts (MW), Horsepower (HP), BTU/hr, and electricity billing units (kWh).
Direct Answer: Power measures the rate of energy transfer or work performed per unit time (\(1\text{ Watt} = 1\text{ Joule/second}\)). For standard conversions: \(1\text{ Kilowatt (kW)} = 1,000\text{ Watts}\), \(1\text{ Mechanical Horsepower (HP)} \approx 745.7\text{ Watts}\), \(1\text{ Megawatt (MW)} = 1,000,000\text{ Watts}\), and \(1\text{ Electricity Unit} = 1\text{ Kilowatt-hour (kWh)}\) (a \(1,000\text{W}\) device running for \(1\text{ hour}\)).
Power Unit Conversion Table
Use this comprehensive power unit conversion table for quick reference across metric, imperial, mechanical, and thermal power units:
| Base Unit | Watt (W) | Kilowatt (kW) | Horsepower (HP) | BTU/hour | Megawatt (MW) |
|---|---|---|---|---|---|
| 1 Watt (W) | 1 | 0.001 | 0.001341 | 3.412142 | 1 × 10⁻⁶ |
| 1 Kilowatt (kW) | 1,000 | 1 | 1.341022 | 3,412.142 | 0.001 |
| 1 Horsepower (HP) | 745.7 | 0.7457 | 1 | 2,544.43 | 0.0007457 |
| 1 BTU/hour | 0.293071 | 0.0002931 | 0.000393 | 1 | 2.931 × 10⁻⁷ |
| 1 Megawatt (MW) | 1,000,000 | 1,000 | 1,341.022 | 3,412,142 | 1 |
| 1 Metric HP (PS) | 735.499 | 0.7355 | 0.98632 | 2,509.62 | 0.0007355 |
| 1 Boiler HP (BHP) | 9,812.5 | 9.8125 | 13.158 | 33,475 | 0.0098125 |
| 1 Gigawatt (GW) | 10⁹ | 10⁶ | 1.341 × 10⁶ | 3.412 × 10⁹ | 1,000 |
Watt to Kilowatt to Megawatt
The transition from Watt to kilowatt to megawatt follows the standard metric decimal scaling based on factors of 1,000 (10³):
Step-by-Step Conversion Formulas:
- Watts to Kilowatts: \( \text{kW} = \frac{\text{Watts}}{1,000} \) (e.g., 2,500 W = 2.5 kW)
- Kilowatts to Megawatts: \( \text{MW} = \frac{\text{kW}}{1,000} = \frac{\text{Watts}}{1,000,000} \) (e.g., 5,000 kW = 5 MW)
- Megawatts to Watts: \( \text{Watts} = \text{MW} \times 1,000,000 \) (e.g., 2 MW = 2,000,000 W)
- Megawatts to Gigawatts (GW): \( \text{GW} = \frac{\text{MW}}{1,000} \) (e.g., 1,500 MW = 1.5 GW)
Electricity Unit Converter to kWh
An electricity unit converter to kWh translates power rating (Watts/kW) and operating duration into actual consumed electrical energy. Need to determine device power from voltage and current? Use our Online Voltage Converter alongside Ohm's Law (\( P = V \times I \)).
Electricity Units vs Power (kW):
In domestic and commercial power billing across the world, 1 Electricity Unit = 1 Kilowatt-hour (1 kWh). Power (kW) represents instantaneous demand, whereas energy (kWh) is the cumulative power used over time.
Watts to Unit Converter India
In India (under State Electricity Boards & DISCOMs like MSEB, BESCOM, TANGEDCO, Tata Power, BSES, and UPPCL), power tariffs follow Bureau of Energy Efficiency (BEE India) standards based on the Board of Trade Unit (B.O.T. Unit):
How to Calculate Indian Electricity Bill Units:
| Appliance | Wattage | Daily Usage | Monthly Units (30 Days) | Est. Cost (@ ₹7/unit) |
|---|---|---|---|---|
| Ceiling Fan | 75 W | 14 hrs/day | \( \frac{75 \times 14 \times 30}{1000} = \mathbf{31.5\text{ units}} \) | ₹220.50 |
| Refrigerator (Frost Free) | 200 W (Compressor cycle ~8h) | 8 hrs active | \( \frac{200 \times 8 \times 30}{1000} = \mathbf{48\text{ units}} \) | ₹336.00 |
| Inverter AC (1.5 Ton) | 1,400 W | 8 hrs/day | \( \frac{1400 \times 8 \times 30}{1000} = \mathbf{336\text{ units}} \) | ₹2,352.00 |
| LED TV (43 inch) | 80 W | 5 hrs/day | \( \frac{80 \times 5 \times 30}{1000} = \mathbf{12\text{ units}} \) | ₹84.00 |
| Water Geyser | 2,000 W | 1.5 hrs/day | \( \frac{2000 \times 1.5 \times 30}{1000} = \mathbf{90\text{ units}} \) | ₹630.00 |
Watt to Unit Per Hour
Here is a direct lookup table showing how many units of electricity per hour appliances of different wattages consume:
| Wattage (W) | Kilowatt (kW) | Units Consumed per 1 Hour | Units Consumed per 10 Hours |
|---|---|---|---|
| 10 W (LED Bulb) | 0.01 kW | 0.01 Units/hr | 0.10 Units |
| 50 W (Laptop/Small Fan) | 0.05 kW | 0.05 Units/hr | 0.50 Units |
| 100 W (Standard Bulb/TV) | 0.10 kW | 0.10 Units/hr | 1.00 Unit |
| 500 W (Mixer/Desktop PC) | 0.50 kW | 0.50 Units/hr | 5.00 Units |
| 1,000 W (Electric Iron) | 1.00 kW | 1.00 Unit/hr | 10.00 Units |
| 1,500 W (1 Ton AC / Room Heater) | 1.50 kW | 1.50 Units/hr | 15.00 Units |
| 2,000 W (Geyser / Induction) | 2.00 kW | 2.00 Units/hr | 20.00 Units |
| 3,000 W (Instant Geyser / Heavy Oven) | 3.00 kW | 3.00 Units/hr | 30.00 Units |
Power Converter 220V to 110V (Voltage & Wattage Guide)
When using appliances purchased in the USA/Canada (110V–120V) in India, UK, or Europe (220V–240V), you need a Step-Down Power Converter (Voltage Transformer).
How Power and Current Behave During 220V to 110V Conversion:
Power remains constant (\( P = V \times I \)). When voltage is halved from 220V to 110V, the required electrical current (Amperes) doubles:
Power Conversion Formulas & Quick Reference
| From | To | Conversion Multiplier | Example Calculation |
|---|---|---|---|
| Watts | Kilowatts | Divide by 1,000 | 1,500 W = 1.5 kW |
| Kilowatts | Watts | Multiply by 1,000 | 2.5 kW = 2,500 W |
| Watts | Horsepower (mechanical) | Divide by 745.7 | 5,000 W = 6.71 HP |
| Horsepower | Watts | Multiply by 745.7 | 3 HP = 2,237 W |
| Kilowatts | Horsepower | Multiply by 1.341 | 100 kW = 134.1 HP |
| Horsepower | Kilowatts | Multiply by 0.7457 | 200 HP = 149.1 kW |
| Watts | BTU/hour | Multiply by 3.412 | 1,000 W = 3,412 BTU/hr |
| BTU/hour | Watts | Multiply by 0.293 | 10,000 BTU/hr = 2,930 W |
| Kilowatts | Megawatts | Divide by 1,000 | 5,000 kW = 5 MW |
| Megawatts | Gigawatts | Divide by 1,000 | 1,200 MW = 1.2 GW |
| HP (metric / PS) | HP (mechanical) | Multiply by 0.9863 | 100 PS = 98.63 HP |
| Boiler HP | Watts | Multiply by 9,812.5 | 1 BHP = 9,812.5 W |
Worked Engineering Examples:
2 HP × 745.7 = 1,491.4 W ≈ 1.5 kW
12,000 × 0.293 = 3,516 W = 3.52 kW
Real-World Power Consumption Examples
Understanding how much power common devices and systems use in everyday residential and industrial operations:
| Device / System | Typical Power | In Kilowatts (kW) | In Horsepower (HP) |
|---|---|---|---|
| LED Bulb | 9 W | 0.009 kW | 0.012 HP |
| Smartphone Fast Charger | 18–65 W | 0.018–0.065 kW | 0.024–0.087 HP |
| Ceiling Fan | 70 W | 0.07 kW | 0.094 HP |
| Desktop Workstation | 250–600 W | 0.25–0.60 kW | 0.33–0.80 HP |
| Microwave Oven | 1,200 W | 1.20 kW | 1.61 HP |
| Air Conditioner (1.5 Ton) | 1,500 W | 1.50 kW | 2.01 HP |
| Electric Car Motor (EV) | 150,000 W | 150 kW | 201 HP |
| Industrial Wind Turbine | 3,000,000 W | 3,000 kW | 4,023 HP (3 MW) |
| Nuclear Power Unit | 1,000,000,000 W | 1,000,000 kW | 1,341,022 HP (1 GW) |
What Is Power & Power Units Explained
Named after Scottish engineer James Watt, power represents how fast energy is consumed. For multi-variable unit analyses, explore the complete suite of OperateTools Unit Converters.
Watt (W)
The fundamental SI unit for electrical and mechanical energy transfer. Used for electronics, lamps, and computing hardware.
Kilowatt (kW)
Equal to 1,000 watts. The standard rating for home appliances, electric heaters, and residential solar inverter capacity.
Megawatt (MW)
Equal to 1,000,000 watts. Used by commercial power plants, grid substations, locomotives, and heavy industrial facilities.
Horsepower — Mechanical (HP)
Equal to 745.7 Watts. Standard measurement for automobile engines, industrial motors, hydraulic pumps, and compressors.
BTU/hour
British Thermal Unit per hour (1 BTU/hr = 0.293 W). Primary rating for HVAC heating and cooling capacities in the Americas.
Gigawatt (GW)
Equal to 1,000 MW or 1 billion watts. Represents national grid capacities and major hydroelectric dams.
Industry Applications of Power Units
⚡ Electrical Engineering
Watts and kilowatts dictate wire gauge sizing, transformer ratings, fuse protections, and power factor correction. Analyze electrical potentials with our Voltage Converter.
☀️ Solar & Renewable Energy
Photovoltaic modules are rated in Watt-peak (Wp). Inverters are sized in kW, while energy yield is measured in kWh.
🚗 Electric Vehicles
EV powertrains specify motor output in kW/HP. Calculate automotive dynamics with our Speed Converter.
🏠 Domestic Appliances
BEE star ratings and energy efficiency standards use Watt consumption ratings to calculate annual running cost.
🏭 Heavy Industrial Motors
Motors are rated in HP or kW. Calculate shaft torque and rotational dynamics using our Torque Converter.
❄️ HVAC Systems
1 Ton refrigeration = 12,000 BTU/hr = 3.52 kW. For compressor pressure ratings, check our Pressure Converter.
Frequently Asked Questions
Units = (Watts × Hours) ÷ 1000. For example, a 1,000W iron used for 2 hours consumes (1000 × 2) ÷ 1000 = 2 units.