Private, client-side calculation

Power Consumption Calculator

Estimate appliance energy use, kWh per day, month and year, plus running cost from watts and daily hours.

Power

Hours / day

Rate

/kWh

Days / month

days

STEP 01🔌

Choose appliance power

Select a typical appliance or enter watts, kilowatts or horsepower manually.

STEP 02⏱️

Add daily runtime

Enter hours used per day and your electricity rate per kWh.

STEP 03📊

Review kWh and cost

See energy per day, month and year with load category and savings ideas.

Daily Energy

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Enter details

⚡

Monthly Energy

—

kWh / month

📅

Yearly Energy

—

kWh / year

🗓️

Monthly Cost

—

at your rate

💵

Carbon Estimate

—

kg CO₂ / month

🌿

Appliance & Usage

Typical appliance

Power consumption

Power unit

Hours of use per day

h/day

Electricity rate

/kWh

Billing days per month

days

Grid CO₂ factor

kg/kWh

Daily Usage Zone Bar

⚡

Calculate to see your energy-use zone

Usage Advice

Enter appliance power and hours used per day.

Consumption Metrics

🧮

Metrics appear after calculation

✦ Result Explainer

✦

Your explanation appears here

▣ Savings Action Plan

📋

Your plan appears after calculation

◎ What If Simulator

Test different hours and electricity rates without changing your main result.

Simulated hours / day 4 h

Simulated rate $0.20/kWh

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Calculate your baseline first

● Ask About Your Result

Calculate first, then ask about kWh, monthly cost or reducing appliance use.

Frequently Asked Questions

It converts the appliance power to kilowatts, multiplies by daily hours to estimate kWh per day, then scales that by billing days and 365 days for monthly and yearly estimates.

Use the all-in price from your utility bill if possible, including delivery charges and taxes. If your tariff changes by time of day, use the rate that matches when the appliance usually runs.

Many appliances cycle on and off, vary with settings, or have startup surges. For the most accurate result, use an average wattage from the label, manual, smart plug or power meter.

Electrical & Calculation Disclaimer

Results are estimates generated locally in your browser from watts, hours and electricity rate. They are for informational purposes only and are not a substitute for certified electrical measurement, utility billing data or professional electrical advice. Use rated equipment and consult a qualified electrician for high-load, mains-voltage or safety-critical decisions.