Sustainability

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Appliance Energy Cost Calculator.

Calculate daily, monthly, and yearly electricity consumption and cost for home appliances

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Results update as you type.

Daily energy: 3.6 kWh

Daily energy

3.6000kWh
Monthly cost: $17.28

Monthly cost

$17.28
Yearly cost: $210.24

Yearly cost

$210.24
Monthly energy: 108 kWh

Monthly energy

108.00kWh
Yearly energy: 1,314 kWh

Yearly energy

1,314.00kWh

How to Use

Energy = watts × hours ÷ 1,000. Monthly estimates use 30 days; yearly estimates use 365 days.

Actual appliance draw may cycle below the nameplate rating. Treat the result as an estimate.

FAQs

How is appliance electricity cost calculated?

Multiply the appliance power in watts by the daily hours used, divide by 1000 to get kilowatt-hours (kWh), and multiply by your local utility rate ($/kWh).

What is vampire power / standby draw?

Standby power is the energy consumed by appliances when they are turned off but still plugged in. Devices like chargers, TVs, and microwaves draw small amounts of power continuously.

How can I reduce my home appliance electricity cost?

Use energy-efficient LED light bulbs, unplug idle electronics, run washing machines and dishwashers only with full loads, and select ENERGY STAR certified products.

Cite this calculator

Canonical URL: https://mathify.one/fr/sustainability/appliance-energy

Cite as: Mathify. (2026). Calculatrice de Coût Énergétique des Appareils. https://mathify.one/fr/sustainability/appliance-energy

Use Cases

Budgeting for Household Energy Costs

Plan your monthly and yearly electricity expenses by estimating the cost of running each appliance. This helps you allocate your budget and identify high-consumption devices.

Example: Estimate the annual cost of running a 1500W space heater for 3 hours a day at $0.15/kWh.

Comparing Appliance Efficiency

Compare the energy consumption of different appliances or models to decide which is more cost-effective in the long run, especially when considering upgrades.

Example: Compare a 100W TV used 4 hours/day versus a 200W TV used 2 hours/day to see which costs less annually.

Frequently Asked Questions

How does the Appliance Energy Cost Calculator work?
Enter the appliance's power rating in watts, average daily usage in hours, and your electricity rate in USD per kWh. The calculator computes daily, monthly, and yearly energy consumption in kWh and the corresponding cost based on your inputs.
What are the common presets in this calculator?
The calculator includes presets for typical household appliances like refrigerators, air conditioners, washing machines, and more. These presets provide approximate power ratings to help you quickly estimate energy usage without needing to look up specifications.
Can I use this calculator for any appliance?
Yes, you can use it for any appliance by entering its specific power rating (in watts), daily usage hours, and your electricity rate. This allows you to estimate energy consumption and cost for devices not included in the presets.

Tips & Common Mistakes

Tips

  • Use the actual power rating from the appliance label or manual for the most accurate estimate.
  • Consider seasonal usage patterns—some appliances like heaters or air conditioners are used more in certain months.
  • Check your electricity bill for the exact rate you pay per kWh, including taxes and fees.
  • Use the calculator to identify energy-hungry appliances and explore ways to reduce their usage.

Common Mistakes to Avoid

  • Entering power in kilowatts instead of watts—ensure you use watts as the unit.
  • Using the maximum power rating instead of the average power consumption, which can vary during operation.
  • Forgetting to account for standby power consumption of devices that are plugged in but not in active use.

Last updated: August 13, 2026