How much does it cost to run an appliance?

Common appliance costs at $0.13/kWh: Central AC (3,500W): ~$3.64/day. Space heater (1,500W): ~$1.56/day. Refrigerator (150W avg): ~$0.47/day. Washing machine (500W): ~$0.07/load. LED TV (100W): ~$0.10/8hrs. Desktop PC (300W): ~$0.31/8hrs. LED bulb (10W): ~$0.01/8hrs. Electric oven (2,500W): ~$0.33/hr.

A kilowatt-hour (kWh) is the standard unit of electrical energy. It equals 1,000 watts used for 1 hour. A 100W bulb running for 10 hours uses 1 kWh. A 2,000W heater running for 30 minutes uses 1 kWh. Your electric bill charges per kWh consumed. The average US residential rate is $0.13-$0.17/kWh (varies widely by state and utility).

What is the average electricity rate in the US?

The US average residential electricity rate is approximately $0.16/kWh (2025-2026). However, rates vary dramatically by state: Hawaii $0.35+/kWh, California $0.25-$0.30, New England $0.22-$0.28, South/Midwest $0.10-$0.14, Pacific Northwest $0.09-$0.12. Check your actual bill for your rate — look for 'price per kWh' or 'energy charge' on the bill details.

How many kWh does a house use per month?

The average US household uses about 886 kWh per month (10,632 kWh/year). This varies by region: South 1,100+ kWh/month (AC), Northeast 600-700 kWh, West Coast 500-700 kWh. Small apartment: 400-600 kWh. Large house: 1,200-2,000+ kWh. Biggest consumers: HVAC (40-50%), water heater (15-20%), appliances (15%), lighting (10%), electronics (5-10%).

How do I read my electricity meter?

Digital meters display kWh directly. Analog meters have 4-5 dials that read left to right (note each dial alternates clockwise/counterclockwise). Subtract last month's reading from current reading = kWh used. Smart meters transmit readings automatically. To verify your bill: read meter on the same day/time for two consecutive months and compare to your billed usage. If significantly different, contact your utility.

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Electricity Cost Calculator: The Complete Guide to kWh, Bills, and Saving Money

Understanding your electricity costs is the first step to reducing them. The average American household spends about $1,500 per year on electricity, but most people have no idea which appliances cost the most to run. This calculator and guide help you break down costs by device and find the biggest savings opportunities in your home.

The Electricity Cost Formula

kWh = Watts × Hours ÷ 1,000
Daily Cost = kWh per day × Rate ($/kWh)
Monthly Cost = Daily Cost × 30 days
Annual Cost = Daily Cost × 365 days
Quick Rule: A 1,000W device at $0.13/kWh costs $0.13/hour

Worked Example — Space Heater

Space heater: 1,500 watts, 8 hours/day
kWh/day: 1,500 × 8 ÷ 1,000 = 12 kWh
Daily: 12 × $0.13 = $1.56/day
Monthly: $1.56 × 30 = $46.80/month
Annual (5 months): $46.80 × 5 = $234/year

Common Appliance Running Costs

Appliance	Watts	Daily Cost*	Monthly*
Central Air Conditioner	3,500	$3.64	$109
Space Heater	1,500	$1.56	$47
EV Charger (Level 2)	7,700	$4.00	$120
Electric Water Heater	4,500	$1.75	$53
Refrigerator	150 avg	$0.47	$14
Desktop PC	300	$0.31	$9
LED TV (55")	100	$0.10	$3
LED Bulb (60W equiv)	10	$0.01	$0.31

*Based on 8 hrs/day usage at $0.13/kWh except refrigerator (24 hrs) and water heater (3 hrs)

Pro Tip — Find Your Biggest Energy Hogs

HVAC (heating and cooling) is typically 40-50% of your electric bill. Water heating is 15-20%. Everything else combined is 30-45%. The single most impactful change: a programmable thermostat ($25-$250) saves 10-15% on HVAC costs ($150-$300/year). Second: switching all bulbs to LED saves $100-$200/year. Third: upgrading to Energy Star appliances when replacing old ones.

Frequently Asked Questions

How do I calculate electricity cost?▼

Watts × Hours ÷ 1,000 × Rate = Cost. Example: 1,500W heater × 8 hrs ÷ 1,000 = 12 kWh × $0.13 = $1.56/day. Monthly: $46.80. Find your rate on your electric bill under "energy charge" or "price per kWh."

What is a kWh?▼

Kilowatt-hour = 1,000 watts used for 1 hour. A 100W bulb for 10 hours = 1 kWh. A 2,000W heater for 30 minutes = 1 kWh. Your bill charges per kWh consumed. Average US rate: $0.13-$0.17/kWh.

What is the average electricity rate?▼

US average: ~$0.16/kWh. Varies by state: Hawaii $0.35+, California $0.25-$0.30, Northeast $0.22-$0.28, South/Midwest $0.10-$0.14, Pacific NW $0.09-$0.12. Check your bill for your actual rate.

How many kWh does a house use monthly?▼

US average: 886 kWh/month. Small apartment: 400-600. Large house: 1,200-2,000+. Southern states use more (AC). Biggest consumers: HVAC 40-50%, water heater 15-20%, appliances 15%, lighting 10%.

How much does it cost to run an AC?▼

Central AC (3,500W): ~$3.64/day (8 hrs at $0.13/kWh) = ~$109/month. Window unit (1,200W): ~$1.25/day = ~$37/month. Mini-split (1,000W): ~$1.04/day = ~$31/month. Actual costs depend on efficiency (SEER rating), thermostat settings, and insulation.

How can I reduce my electricity bill?▼

Top savings: programmable thermostat (10-15% on HVAC), LED bulbs (75% less than incandescent), Energy Star appliances, seal air leaks, cold-water laundry, unplug phantom loads (5-10% of usage), ceiling fans before AC. Total potential savings: 20-40%.

How do I find my electricity rate?▼

Check your electric bill — look for "energy charge," "price per kWh," or "rate." Divide total energy charges by total kWh used. Some utilities have tiered rates (higher price above certain usage) or time-of-use rates (cheaper off-peak). Your utility's website also lists current rates.