Electricity Cost Calculator - kWh Bill Estimate Online
Calculate daily, monthly, and annual electricity costs for any appliance based on wattage and usage hours.
How to use this calculator
👉 Fill in the boxes below and your answer appears instantly — no maths needed, we do it all for you! 🎉
In plain English — what does this do?
📊 A helper for daily life! Things like working out your age, how much to tip, what a sale price is, or how long until your birthday. Quick and easy answers for real life!
The Electricity Cost Calculator estimates how much it costs to run an electrical appliance based on its wattage, daily usage hours, and your local electricity rate. It breaks down costs by day, month, and year.
Monthly Cost
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Daily Cost
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Annual Cost
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kWh / Month
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What is Electricity Cost Calculator - kWh Bill Estimate Online?
The Electricity Cost Calculator estimates how much it costs to run an electrical appliance based on its wattage, daily usage hours, and your local electricity rate. It breaks down costs by day, month, and year.
How to use it
- 1️⃣ Enter the appliance wattage (found on the label or in the manual).
- 2️⃣ Enter how many hours per day the appliance runs.
- 3️⃣ Enter the number of days per month (default 30).
- 4️⃣ Enter your electricity rate in dollars per kWh — check your utility bill (US average is about $0.13/kWh).
- 5️⃣ Click Calculate to see your daily, monthly, and annual costs.
Formula
💡 See it in action — a real example
❓ Common questions
- Where do I find my electricity rate?
- Check your utility bill — look for the per-kWh charge. The US residential average is around $0.13–0.16/kWh, but rates vary widely by state and provider.
- What is a kWh?
- A kilowatt-hour is the energy used by a 1000 W appliance running for one hour. It is the standard billing unit for electricity.
- How do I find an appliance's wattage?
- Check the label on the back or bottom of the appliance, the owner's manual, or search the model number online. Power strips and smart plugs can also measure actual usage.
- Does this include standby power?
- No — this calculator assumes the appliance draws the stated wattage during active use only. Standby draw (phantom load) is typically 1–5 W per device.
- Why does my bill differ from the estimate?
- Actual bills include taxes, fees, tiered rates, and seasonal adjustments. This calculator gives a baseline estimate based on a flat per-kWh rate.