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Electricity Calculator

Calculate electricity usage and cost based on power requirements and usage of appliances. Adjust the usage for each appliance to most accurately reflect your personal usage.

How to use: Select a typical appliance or define your own power requirements, set usage patterns, and calculate electricity consumption and costs.

Electricity Usage Calculator

Percentage of power actually being used (most appliances don't run at full capacity)
Electricity Usage & Cost Results

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Understanding Electricity Usage and Power Units

Calculating electricity usage and costs is essential for managing energy consumption and reducing utility bills. This calculator helps you estimate electricity usage based on appliance power requirements and usage patterns.

Units of Electricity

One of the most common units of electrical power for appliances is the watt (W). Other common units include kilowatts (kW), British thermal units (BTU), horsepower (hp), and tons.

Key Formula: Energy (kWh) = Power (kW) × Time (hours) × Capacity (%) ÷ 100

Power Unit Conversions

Watts and Kilowatts: Watts (W) quantify the rate of energy transfer (1 joule per second). One kilowatt (kW) equals 1,000 watts. Kilowatt-hours (kWh) measure energy - the amount needed to maintain one kilowatt for one hour.

BTU and BTU/h: British thermal units measure heat energy. 1 BTU = 0.2931 watt-hours, and 1 kWh ≈ 3412 BTU.

Horsepower: Used for motors and engines. 1 mechanical horsepower = 745.7 watts, 1 metric horsepower = 735.5 watts.

Ton (Refrigeration): Used for cooling systems. 1 ton ≈ 3517 watts ≈ 12000 BTU/h.

Common Appliance Power Usage

Common AppliancesEstimated Wattage (W)
Home Appliances
Air Conditioner (HVAC)2500-10000
Air conditioner (window unit)1500-5000
Heater (home)5000-20000
Heater (portable)750-2000
Fan (ceiling, table)15-200
Light bulb (LED)3-25
Light bulb (incandescent)15-200
Electric water heater3000-6600
Kitchen Appliances
Refrigerator500-1000
Electric range/oven2000-5000
Microwave oven750-1500
Dishwasher1200-2000
Coffee maker600-1200
Other Appliances
Electric vehicle charger1500-20000
Television25-500
Washing machine400-1500
Clothes dryer1800-5000
Desktop computer100-250
Laptop computer35-150

Energy Saving Tips

Monitor Usage: Track energy habits and turn off unused appliances. Use fans instead of AC when possible.

Upgrade Equipment: Replace incandescent bulbs with LEDs (75W vs 9W). Choose energy-efficient appliances.

Smart Controls: Use programmable thermostats for heating/cooling optimization.

Home Insulation: Improve windows, doors, and insulation to reduce heating/cooling costs.

Important Note: Appliance labels show maximum power requirements. Actual usage is typically lower due to capacity settings and usage patterns, which this calculator accounts for.