everyday ToolUpdated 2026-09-19
Electricity Cost Calculator
Find out how much electricity your home appliances consume and how much they cost to operate each month.
Formula & Mathematical Methodology
Cost = (Watts × Hours ÷ 1000) × Rate ($/kWh)
Converts watts to kilowatts, multiplies by daily operating hours and utility rate per kilowatt-hour.
How to Use This Electricity Cost Calculator
- Enter appliance wattage (found on back label), daily run hours, and local cost per kWh.
Step-by-Step Worked Example
Scenario: 1,500W space heater running 6 hrs/day at $0.16/kWh
1. Daily kWh: (1,500 × 6) ÷ 1,000 = 9 kWh/day
2. Daily cost: 9 × $0.16 = $1.44/day
3. Monthly cost (30 days): $1.44 × 30 = $43.20/month
Final Calculated Result: $1.44 / day ($43.20 / month)
What Does Your Result Mean?
Pinpoints high-draw appliances contributing to seasonal electrical utility spikes.
Common Practical Applications:
- Space heater and A/C usage budgeting
- Gaming PC power consumption
- EV home charging estimation
Important Limitations & Assumptions:
- Appliances with cycling thermostats (refrigerators, AC units) do not draw continuous maximum wattage.
Frequently Asked Questions
What is the average US residential electricity rate?
The average US residential electricity rate is approximately $0.16 to $0.17 per kilowatt-hour (kWh).
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