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Electricity Cost Calculator

Estimate daily energy use and running cost. Live updates, unit-aware inputs, and PDF export.

Input

⚡ Power consumption ?

Tip: Check the appliance nameplate.

💰 Energy price ?

per kWh

Find this on your bill.

⏱️ Usage time ?

We’ll use your days for monthly/yearly costs. Daily energy always uses hours/day.

Live results

📊 Power consumed (per day)

Formula: P × hours/day ÷ 1000 ⇒ kWh/day

🧾 Cost (choose unit)

C_month = C_day × 30.4375 • C_year = C_day × 365.25

Quick summary

Enter values above to see your summary…

Step-by-step derivation

1) Convert power to kilowatts: P_kW = P_W / 1000
2) Daily hours: h_day (user input)
3) Daily energy: E_day(kWh) = P_kW × h_day
4) Daily cost:  C_day = E_day × price_per_kWh
5) Monthly cost: C_month = C_day × Days_month
6) Annual cost:  C_year  = C_day × Days_year

Reference table & sources

Fact	Value
1 kilowatt-hour	1 kWh = 1000 Wh
Default days per week	7
Default days per month	≈ 30.4375
Default days per year	≈ 365.25

Adjust the days to match your usage pattern (e.g., 22 working days/month).

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