The result shows monthly kWh, monthly cost and cumulative annual cost.
Everyday calculator
Electricity Cost Calculator
Enter an appliance's power and usage pattern to estimate how much it adds to the electricity bill.
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No account. Formula and assumptions are shown below.
Calculator inputs
Electricity cost details
Formula & disclaimer
Monthly kWh = Watts Γ· 1,000 Γ Hours per Day Γ Days Γ Quantity; Cost = kWh Γ Entered Rate
View assumptionsFormula reviewCalcs at Hand Editorial TeamVerified 28 August 2026 Β· automated checks included
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Resultβ
Projection
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Formula & details
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How to read this result
Three useful checks, kept deliberately short.
A 1,000 W appliance used three hours daily for 30 days at RM0.45/kWh: Convert watts to kilowatts Β· Multiply by usage hours and days Β· Multiply 90 kWh by the entered rate.
Tiered tariffs, taxes, rebates, standby use and efficiency cycling can change the actual bill.
Formula and assumptions
Monthly kWh = Watts Γ· 1,000 Γ Hours per Day Γ Days Γ Quantity; Cost = kWh Γ Entered RateUse the appliance's rated or measured watts and the effective rate from the bill you are analysing.
Keep in mind: This is an appliance estimate, not a replica of a tiered utility bill.
Produced byCalcs at Hand Editorial Team
Last formula check28 August 2026
Review methodKnown examples + boundary cases
Editorial and correction policy β