Appliance Electricity Cost Calculator
Curious what an appliance really costs in electricity? Enter the power draw (in watts), how many hours a day it runs and your electricity price for a monthly and yearly estimate.
結果
￥4.5
Cost per month
- Cost per year
- ￥54
How this was calculated
- 1Monthly use in kWh(100 ÷ 1000) × 5 × 30 = 15 kWh
- 2Multiply by electricity price15 kWh × ￥0.3/kWh = ￥4.5
公式
Cost = (watts ÷ 1000) × hours per day × days per month × price per kWh
Power in watts is converted to kilowatts by dividing by 1000. Multiplied by the running hours, you get consumption in kWh, which you multiply by your price per kWh for the cost.
ステップ解説
- 1Find your appliance's power rating (usually on the nameplate or in the manual).
- 2Estimate how many hours per day the appliance runs on average.
- 3Enter your monthly electricity price (check your bill for the current rate).
計算例
A 100 W appliance, 5 hours a day, 30 days per month, EUR 0.30/kWh
→ EUR 4.50 per month, EUR 54 per year.
A refrigerator at 150 W, 24 hours a day, 30 days per month, EUR 0.28/kWh
→ EUR 30.24 per month, EUR 362.88 per year.
A heat pump at 3000 W, 8 hours a day, 30 days per month, EUR 0.22/kWh
→ EUR 158.40 per month, EUR 1,900.80 per year.
Reference table
| Appliance | Power | Typical use |
|---|---|---|
| LED lamp | 9 W | 5 hours/day |
| Refrigerator | 150 W | 24 hours/day |
| Washing machine | 2000 W | 1 hour/day |
| Oven | 3000 W | 1 hour/day |
| Heat pump | 3500 W | 6 hours/day |
Values are approximate; check your appliance nameplate for exact watts.
よくある間違い
- Confusing watts and kilowatts — make sure you divide watts by 1000 to get kilowatts.
- Only accounting for peak usage; many appliances don't run at full power continuously.
- Using outdated electricity rates — check your latest bill for current prices.
活用シーン
- Assessing whether a more energy-efficient appliance is worth the investment.
- Determining which household appliance uses the most electricity.
- Planning for an energy-saving or sustainability project at home.
よくある質問
Where do I find my appliance's power draw?
Usually on the appliance's rating plate (back or bottom) or in the manual, listed in watts (W).
Why does my actual bill differ from the calculation?
This is an estimate based on average usage. Your actual consumption can vary due to seasonal changes, appliance efficiency, and fluctuations in your usage patterns.
Can I see the cost per day?
Yes, divide the monthly cost by the number of days per month (usually 30) to get the daily cost.
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