Live Energy Calculator

Electricity Cost Calculator for Any Device

Calculate how much electricity your appliances, computers, TVs, heaters, air conditioners, and smart devices use — and estimate their running cost per hour, day, month, or year.

450 W

$16.43 / month

197 kWh/year

Device Settings

Device Name

Number of Devices

Device Power

Hours per Day

Days per Week

Electricity Cost

Currency

Price per kWh

Enter your local electricity price per kWh. The default value is only an example.

Include Standby Power

Popular Device Presets

Savings Simulator

See how much you could save by simply reducing your device usage.

Device Power (Watts)

Current Usage (Hours/Day)

Reduce usage by (Hours/Day)

Estimated Yearly Savings$218.40$18.25 per monthSaves 728 kWh / year

How Electricity Cost is Calculated

Watts (W) & Kilowatts (kW)

Watts measure the rate of power flow. A kilowatt (kW) is simply 1,000 watts. To find your device's kW, divide its wattage by 1,000. For example, a 1500W heater uses 1.5 kW.

Kilowatt-hours (kWh)

Energy is billed in kilowatt-hours (kWh), which is power used over time. Running a 1 kW (1000W) device for 1 hour consumes exactly 1 kWh of electricity.

Electricity Price

Your utility company charges a specific rate per kWh. By multiplying your total kWh by this rate, you get your total cost. Prices vary significantly by region and time of day.

Standby Power

Also known as "vampire power," many devices consume electricity even when turned off but plugged in. Modern TVs and gaming consoles in standby mode can add up over a year.

Common Device Examples

Device	Typical Watts	Typical Use	Est. Monthly kWh	Notes
Gaming PC	450 W	4 hrs/day	54 kWh	Depends heavily on GPU load
Refrigerator	80 W	24 hrs/day	58 kWh	Compressor cycles on/off
Air Conditioner	1200 W	6 hrs/day	216 kWh	High seasonal usage
TV (LED)	120 W	4 hrs/day	14.4 kWh	Larger screens use more
Electric Heater	2000 W	3 hrs/day	180 kWh	Very high power draw
MacBook/Laptop	60 W	8 hrs/day	14.4 kWh	Highly efficient
LED Bulb	10 W	5 hrs/day	1.5 kWh	Replacing incandescents saves a lot

Frequently Asked Questions

Multiply your device's wattage by the hours you use it per day. Divide by 1000 to get kilowatt-hours (kWh). Then multiply by your local electricity price per kWh.

A kilowatt-hour (kWh) is a measure of electrical energy equivalent to a power consumption of 1,000 watts for 1 hour.

Running a 1000W (1 kW) device for one hour uses exactly 1 kWh. If your electricity rate is $0.30/kWh, it costs $0.30 per hour.

A typical gaming PC uses between 300W and 600W while gaming. Over a year, this can cost anywhere from $50 to $200 depending on playtime and local electricity rates.

Calculators provide estimates based on continuous maximum draw. Many devices, like refrigerators and air conditioners, cycle on and off or vary their power draw. Additionally, taxes and delivery fees affect your final bill.

Yes! Standby power, or vampire draw, can account for up to 10% of residential electricity use. Devices like TVs, chargers, and consoles consume power even when turned 'off'.