Monthly Cost
$2.88
Daily
$0.10
Yearly
$35.04
Power
100W
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Inputs
Result
Daily: (10 × 8) / 1000 = 0.08 kWh × $0.12 = $0.0096/day. Monthly: $0.0096 × 30 = $0.29. Yearly: $0.0096 × 365 = $3.50.
Inputs
Result
Daily: (1500 × 6) / 1000 = 9 kWh × $0.12 = $1.08/day. Monthly: $1.08 × 30 = $32.40. Yearly: $1.08 × 365 = $394.20.
Multiply the device wattage by hours of use per day, divide by 1,000 to get kWh, then multiply by your electricity rate. For example, a 100W light bulb used 8 hours/day at $0.12/kWh costs: (100 × 8) / 1000 × $0.12 = $0.096 per day, or about $2.88 per month.
The average US residential electricity rate is approximately $0.16 per kWh as of 2024, though rates vary significantly by state. Hawaii has the highest rates (around $0.43/kWh) while states like Louisiana and Idaho have lower rates (around $0.10-0.12/kWh).
| Region | Avg Rate ($/kWh) | Avg Monthly Bill |
|---|---|---|
| Southeast | $0.12–$0.14 | $130–$160 |
| Midwest | $0.13–$0.16 | $110–$140 |
| Northeast | $0.20–$0.27 | $120–$170 |
| West Coast | $0.16–$0.25 | $100–$150 |
| Hawaii | $0.40–$0.43 | $170–$220 |
The biggest electricity consumers in a typical home are heating and cooling (40-50% of the bill), water heater (14-18%), washer and dryer (13%), lighting (12%), and refrigerator (4-8%). Individual high-wattage appliances include space heaters (1,500W), hair dryers (1,800W), and electric ovens (2,500W).
| Appliance | Wattage | Monthly Cost (at $0.12/kWh) |
|---|---|---|
| Central AC (3-ton) | 3,500W | $50–$80 (8 hrs/day) |
| Space Heater | 1,500W | $32 (6 hrs/day) |
| Electric Water Heater | 4,500W | $40–$50 (3 hrs/day) |
| Refrigerator | 150–400W | $5–$15 (24 hrs) |
| LED Bulb | 10W | $0.29 (8 hrs/day) |
The average US household uses about 886 kWh per month (10,632 kWh per year). This varies by region, home size, and climate. Southern states with air conditioning tend to use more, averaging 1,100+ kWh/month in summer.
Yes, but many devices consume standby (phantom) power even when off. TVs, game consoles, chargers, and computers can draw 5-25W when in standby. Using power strips to fully disconnect devices can save 5-10% on your electricity bill.
Energy, conversion, and everyday calculators
Last Updated: Mar 26, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.