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Electricity Cost Calculator

Everyday life
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Calculates the cost of running an electrical device based on its wattage, usage time, and electricity rate.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Device Wattage (Watts), Daily Usage Time (Hours), and Electricity Rate (USD per kWh) in the units shown.

Step 2

Read Kilowatt-hours Used Per Day, Daily Electricity Cost, Monthly Electricity Cost (30 days), and Yearly Electricity Cost in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Low Wattage, Short Usage

Device Wattage (Watts): 60; Daily Usage Time (Hours): 2; Electricity Rate (USD per kWh): 0.15

Kilowatt-hours Used Per Day: 0.12 kWh; Daily Electricity Cost: 0.018 USD; Monthly Electricity Cost (30 days): 0.54 USD; Yearly Electricity Cost: 6.48 USD

Medium Wattage, Moderate Usage

Device Wattage (Watts): 100; Daily Usage Time (Hours): 4; Electricity Rate (USD per kWh): 0.15

Kilowatt-hours Used Per Day: 0.4 kWh; Daily Electricity Cost: 0.06 USD; Monthly Electricity Cost (30 days): 1.8 USD; Yearly Electricity Cost: 21.6 USD

High Wattage, Long Usage

Device Wattage (Watts): 1,500; Daily Usage Time (Hours): 8; Electricity Rate (USD per kWh): 0.15

Kilowatt-hours Used Per Day: 12 kWh; Daily Electricity Cost: 1.8 USD; Monthly Electricity Cost (30 days): 54 USD; Yearly Electricity Cost: 648 USD

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