Electricity Bill Calculator
Estimate your electricity cost based on appliance power, daily usage, number of days and your unit rate.
Overview
This electricity bill calculator helps you estimate how much it costs to run an appliance or device using its power rating, daily usage time, electricity unit rate and any daily standing charge. It is useful for checking running costs over a chosen number of days.
How it works
The calculator converts the appliance power from watts to kilowatts, multiplies that by the hours used each day to get daily energy use in kWh, and then multiplies by the number of days for total usage. It then applies your unit rate to estimate usage cost and adds any daily standing charge to estimate the total bill.
How to use this calculator
- 1Enter the appliance power in watts.
- 2Add how many hours per day the appliance is used.
- 3Enter the number of days you want to estimate.
- 4Input your electricity rate per kWh.
- 5Add any daily standing charge and review the estimated total cost.
Example Calculation
Appliance Power
1000
Hours Used Per Day
4
Number of Days
30
Electricity Unit Rate
$0
Daily Standing Charge
$1
Estimated Total Cost
$45.00
A 1000 W heater used for 4 hours per day over 30 days uses about 120 kWh. At 0.25 per kWh, the usage cost is about 30.00, and with 15.00 in standing charges, the estimated total bill is 45.00.
Frequently asked questions
What does this electricity bill calculator estimate?
It estimates electricity usage in kWh and the likely cost over a selected period based on power, usage time, unit rate and standing charge.
How do I find the power rating of an appliance?
Check the product label, user manual or manufacturer specifications. Power is usually shown in watts or kilowatts.
What is a kWh?
A kilowatt-hour is a unit of energy. It represents using 1 kilowatt of power for 1 hour.
Does this calculator include standing charges?
Yes, you can enter a daily standing charge so it is included in the total estimate.
Will this match my exact electricity bill?
Not always. Actual bills can vary due to changing tariffs, taxes, meter readings, tiered pricing or time-of-use rates.
Can I use this for more than one appliance?
Yes, but this version is best for one appliance at a time. You can calculate each appliance separately and add the results.
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Assumptions and warnings
Assumptions
- The appliance runs at the same power level for the full usage time entered.
- Your electricity unit rate stays the same over the selected period.
- Standing charges are applied once per day at a fixed rate.
- The estimate does not include time-of-use pricing, tiered tariffs or taxes unless already reflected in your rate.
Warnings
- This calculator provides an estimate only and actual bills may differ by tariff, meter readings and supplier charges.