Everyday life

Electricity Cost Calculator

Estimate the running cost of an appliance.

Power (W)

Hours per day

Number of days (days)

Price per kWh ($)

Calculated Output

Total cost ($) 13.5

Energy used (kWh) 90

Formula: kWh = W ÷ 1000 × hours × days ; cost = kWh × price

Step-by-Step Breakdown

1. Values used:

2. Power = 1,000 W

3. Hours per day = 3

4. Number of days = 30 days

5. Price per kWh = 0.15 $

7. Total cost = 13.5$

8. Energy used = 90kWh

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The math behind it

Energy (kWh) = power in kW × hours of use. Cost = energy × price per kWh.

1,000 W for 3 h/day over 30 days at $0.15/kWh → 90 kWh × 0.15 = $13.50.

Where do I find an appliance's watts?

On its label/nameplate, or estimate from its amps × volts.