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Electricity Cost Calculator
Calculate daily/monthly electricity costs from power consumption.
Currency:
W
hours
$/kWh
About Electricity Calculator
計算式: 電気代 = 消費電力(W) × 使用時間(h) ÷ 1000 × 電力単価(円/kWh)
電力単価は電力会社やプランにより異なります。全国平均は約31円/kWh（2024年時点）です。
CO2排出量は全国平均排出係数0.457 kg-CO2/kWhで計算しています。杉の木1本の年間CO2吸収量は約14kgです。
📖How to Use
- 1Enter the appliance wattage (W) and daily usage hours
- 2Set the electricity unit price (JPY/kWh); Japan's average is about ¥31/kWh
- 3See daily, monthly, and annual electricity costs
💡Tips & Knowledge
- •Electricity rates vary by provider. Check your bill or account portal for your rate
- •Standby power accounts for about 5–6% of household electricity. Use power strips with switches rather than unplugging
- •An air conditioner costs about ¥10,000–15,000/year. Adjusting temperature by 1°C saves around 10%
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All calculations run in your browser. No data is sent to any server.