Mathematical Formula & Method
Electricity Cost Calculator Formula
Daily kWh = (Watts × Hours) / 1000 | Monthly Cost = Daily kWh × 30 × Cost per kWh
Worked Examples & Step-by-Step Solutions
1500W AC used 4 hrs/day at $0.15/kWh
- Daily kWh = (1500 × 4) / 1000 = 6.00 kWh/day.
- Daily Cost = 6.00 × $0.15 = $0.90/day.
- Monthly Cost (30 days) = $0.90 × 30 = $27.00/month.
How to Use the Electricity Cost Calculator
- Enter wattage of appliance (found on label), hours used daily, and rate per kWh from utility bill.
Important Assumptions & Unit Conventions
- Excludes base meter charges and tiered utility rate adjustments.
Frequently Asked Questions
How many watts is 1 kWh?
1 kilowatt-hour (kWh) equals 1,000 watts of power used continuously for 1 hour.
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