Electricity Calculator

Estimate electricity usage and cost for any appliance. Calculate daily, weekly, monthly, and annual costs based on power and usage.

Electricity Cost Worksheet

Typical Appliance

Appliance power

Use / run atPercent of rated power actually drawn

Usage

Electricity pricePrice per kWh

Monthly cost $43.20

270 kWh/month

	kWh	Cost
Per Day	9	$1.44
Per Week	63	$10.08
Per Month	270	$43.20
Per Year	3285	$525.60

Effective Power

1.5 kW

Daily kWh

Annual Cost

$525.60

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How to Calculate Electricity Cost

The formula is straightforward: convert watts to kilowatts, multiply by hours of use, then multiply by your electricity rate.

Cost = (Watts ÷ 1,000) × Hours × Price per kWh

Example

A 1,500W space heater running 6 hours per day at $0.16/kWh:

Power: 1,500W ÷ 1,000 = 1.5 kW
Daily: 1.5 × 6 = 9 kWh × $0.16 = $1.44/day
Monthly: 9 × 30 = 270 kWh × $0.16 = $43.20/month
Yearly: 9 × 365 = 3,285 kWh × $0.16 = $525.60/year

Common Appliance Costs

Appliance	Watts	Typical Use	Monthly Cost*
Central AC	3,500	8 hrs/day	$134.40
Water Heater	4,500	3 hrs/day	$64.80
Space Heater	1,500	8 hrs/day	$57.60
Dryer	3,000	1 hr/day	$14.40
Refrigerator	150	24 hrs/day	$17.28
TV (LED 55")	80	5 hrs/day	$1.92
Desktop PC	200	8 hrs/day	$7.68
LED Bulb	10	8 hrs/day	$0.38
WiFi Router	12	24 hrs/day	$1.38
EV Charger (L2)	7,200	4 hrs/day	$138.24

*Based on $0.16/kWh national average

Tips to Reduce Electricity Costs

Switch to LED: LED bulbs use 75% less energy than incandescent — a 10W LED replaces a 60W bulb
Use smart power strips: Eliminate "phantom load" from devices on standby (TVs, chargers, game consoles)
Adjust thermostat: Each degree of AC cooling adds ~3% to your cooling bill
Run appliances off-peak: Many utilities offer lower rates during off-peak hours (nights, weekends)
Upgrade old appliances: ENERGY STAR appliances use 10-50% less energy than standard models
Air seal your home: Sealing drafts reduces heating/cooling costs by 10-20%

Average Electricity Prices by Region

Region	Avg. $/kWh
US National Average	$0.16
New England	$0.25-0.35
Pacific (CA, OR, WA)	$0.18-0.30
South Atlantic	$0.12-0.16
Mountain	$0.11-0.15
Central	$0.10-0.14
Hawaii	$0.35-0.45

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Frequently Asked Questions

How much does it cost to run a 1,500 watt heater?

A 1,500 watt heater running 6 hours a day at $0.16 per kWh costs about $1.44 a day, or about $43 a month. The formula is cost = power in kW x hours used x price per kWh, so 1.5 x 6 x 0.16 = $1.44. Heaters with a thermostat cycle off, so their real cost is often lower.

What is a kWh?

A kilowatt-hour (kWh) is the energy a 1,000 watt appliance uses in 1 hour, and it is the unit an electric bill charges for. A 100 watt bulb takes 10 hours to use 1 kWh, while a 2,000 watt appliance uses 1 kWh in 30 minutes. Multiply kWh by the rate per kWh to get cost.

What is the average electricity price per kWh in the US?

The US average residential electricity price is about $0.16 per kWh. Rates vary widely by state, from about $0.10 in states such as Louisiana to $0.35 or more in Hawaii and California. The exact rate appears on a monthly electric bill, often split into a supply charge and a delivery charge per kWh.

How much does it cost to leave a device on all year?

A year has 8,760 hours, so annual kWh = watts x 8,760 / 1,000. A 12 watt router left on all the time uses about 105 kWh a year, about $17 at $0.16 per kWh. Devices in standby often draw 1 to 5 watts each, and many of them together add a measurable amount to a bill.