How do I find my appliance's wattage?

Check the back/bottom of the device or its manual — there's usually a sticker showing watts (W) or amps × volts.

Where do I find my cost per kWh?

Look at your most recent electricity bill. Divide total cost by total kWh used, or use the published 'unit rate' if shown separately.

Why is the monthly figure based on 30 days?

30 days is a clean average month. For exact billing-cycle math, multiply the daily figure by your cycle length.

Does this account for standby power?

Only if you include standby hours. To capture phantom load, set 'hours per day' to 24 and use the standby wattage.

Are device presets accurate for my model?

Presets are typical mid-range values. Your exact appliance may draw more or less — override the wattage with your real number for precision.

How do I find my appliance's wattage?

Check the back/bottom of the device or its manual — there's usually a sticker showing watts (W) or amps × volts.

Where do I find my cost per kWh?

Look at your most recent electricity bill. Divide total cost by total kWh used, or use the published 'unit rate' if shown separately.

Why is the monthly figure based on 30 days?

30 days is a clean average month. For exact billing-cycle math, multiply the daily figure by your cycle length.

Does this account for standby power?

Only if you include standby hours. To capture phantom load, set 'hours per day' to 24 and use the standby wattage.

Are device presets accurate for my model?

Presets are typical mid-range values. Your exact appliance may draw more or less — override the wattage with your real number for precision.

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Life & School

Electricity Cost Estimator

Wattage · hours per day · cost per kWh — instant daily, monthly & yearly cost

Electricity Cost

Device preset (optional)

Wattage

Hours used per day

Currency

Cost per kWh

Estimate

Per month

$1.80

12.0 kWh · 30-day month

Per day

$0.06

0.40 kWh

Per year

$21.90

146.0 kWh

How it works

Formula

kWh = (W × h) ÷ 1000

cost = kWh × rate

Typical kWh rates

US$0.16
UK£0.27
EU avg€0.25
India₹7.0
AustraliaA$0.30

FAQs

How do I find my appliance's wattage?: Check the back/bottom of the device or its manual — there's usually a sticker showing watts (W) or amps × volts.
Where do I find my cost per kWh?: Look at your most recent electricity bill. Divide total cost by total kWh used, or use the published 'unit rate' if shown separately.
Why is the monthly figure based on 30 days?: 30 days is a clean average month. For exact billing-cycle math, multiply the daily figure by your cycle length.
Does this account for standby power?: Only if you include standby hours. To capture phantom load, set 'hours per day' to 24 and use the standby wattage.
Are device presets accurate for my model?: Presets are typical mid-range values. Your exact appliance may draw more or less — override the wattage with your real number for precision.

How it works▾