Appliance Electricity Consumption & Utility Bill Calculator
Electrical utility energy cost C equals appliance power P (converted from Watts to Kilowatts) multiplied by daily operating hours h, billing period days d, and the utility tariff per kWh.
Utility bill charge for the period
Active power consumption in Watts (switch unit to kW)
Hours operated per day (1 to 24)
Number of days (30 = monthly, 365 = annual)
Utility cost per kilowatt-hour
Step-by-Step Calculation
Electrical utility energy cost C equals appliance power P (converted from Watts to Kilowatts) multiplied by daily operating hours h, billing period days d, and the utility tariff per kWh.
Real-World Reference Values
1,500 W space heater for 3 hr/day over 30 days
Every 1W of 24/7 phantom load uses 8.76 kWh/yr
Varies from $0.11 (Hydro NW) to $0.32+ (CA / NE)
20-Row Comparison Table
Total Electricity Cost (C) · Appliance Power Draw (P)
| # | Appliance Power Draw (W) | Total Electricity Cost ($) | Δ % |
|---|---|---|---|
| 01 | 1 W | 0.0144 $ | -99.93% |
| 02 | 803.5717 W | 11.5714 $ | -46.43% |
| 03 | 1,500.00 WCurrent | 21.6 $ | 0.00% |
| 04 | 2,408.72 W | 34.6855 $ | +60.58% |
| 05 | 3,211.29 W | 46.2425 $ | +114.09% |
| 06 | 4,013.86 W | 57.7996 $ | +167.59% |
| 07 | 4,816.43 W | 69.3566 $ | +221.10% |
| 08 | 5,619.00 W | 80.9136 $ | +274.60% |
| 09 | 6,421.57 W | 92.4707 $ | +328.10% |
| 10 | 7,224.15 W | 104.0277 $ | +381.61% |
| 11 | 8,026.72 W | 115.5847 $ | +435.11% |
| 12 | 8,829.29 W | 127.1418 $ | +488.62% |
| 13 | 9,631.86 W | 138.6988 $ | +542.12% |
| 14 | 10,434.43 W | 150.2558 $ | +595.63% |
| 15 | 11,237.00 W | 161.8129 $ | +649.13% |
| 16 | 12,039.58 W | 173.3699 $ | +702.64% |
| 17 | 12,842.15 W | 184.9269 $ | +756.14% |
| 18 | 13,644.72 W | 196.484 $ | +809.65% |
| 19 | 14,447.29 W | 208.041 $ | +863.15% |
| 20 | 15,249.86 W | 219.598 $ | +916.66% |
Frequently Asked Questions
How much does 1 Watt of 24/7 standby power cost per year?+
One Watt running 24 hours × 365 days consumes 8.76 kWh per year, costing roughly $1.40/year at $0.16/kWh.
How do I find the effective $/kWh rate from my monthly utility bill?+
Click SOLVE FOR on Rate ($/kWh), enter your total bill C, and set (P/1000) × h × d equal to your billed kWh.
Does a compressor appliance (fridge/AC) draw nameplate wattage 100% of the time?+
No. Thermostatically cycled compressors typically run at a 30% to 50% duty cycle; multiply nameplate wattage by the duty cycle.