How do I calculate an appliance's electricity cost?

Multiply the wattage by the hours used per day and your rate: a 1,500 W space heater running 4 hours at $0.15/kWh costs 1.5 x 4 x 0.15 = $0.90 per day, about $27 monthly. The calculator converts wattage to kilowatts, applies your rate, and shows daily, monthly, and yearly costs for each appliance you add.

How much does my refrigerator cost per year?

A typical modern fridge uses 300–700 kWh per year, costing $45–$105 at $0.15/kWh depending on size and efficiency. Older units and garage fridges use significantly more. Enter the wattage from the label or your estimate, and the calculator projects the annual cost so you can compare appliances and spot the expensive ones.

What is the biggest energy user in a home?

Heating and cooling dominate most homes — HVAC can be 40–50% of the electricity bill — followed by water heating, the refrigerator, and laundry. The calculator's per-appliance breakdown helps you find where the money goes; tackling the largest users with efficiency measures gives the biggest bill reduction.

How do I read the wattage on an appliance label?

Look for the wattage (W) or amperage (A) on the nameplate: watts are used directly, and amps multiply by your voltage (usually 120V or 240V) to get watts. The label may list amps and volts instead, so W = A x V. Enter that figure into the calculator with your usage hours for the cost projection.

Do standby devices really waste energy?

Yes — devices in standby mode draw 1–10 W each, and a home with many electronics can lose 5–10% of its electricity to vampire loads. Ten devices at 5 W each running 24 hours cost about $65 per year at $0.15/kWh. The calculator can model standby consumption so you can decide what to unplug.

Can I reduce my bill with this calculator?

Yes — the tool's appliance breakdown shows exactly which devices cost the most, and you can test scenarios: swap a 3,000 W water heater usage pattern, replace an old fridge with an efficient one, or reduce a space heater's hours. Each change's savings appear immediately in the monthly and yearly totals.

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Home Energy Usage Calculator | Estimate Appliance Electricity Cost

Break your electricity bill down appliance by appliance — wattage, hours, and rate become daily, monthly, and yearly costs. Find the biggest energy users in your home and see exactly what each change to usage or efficiency saves on the bill.

Last updated: August 2026 · Free · No sign-up required

Home energy usage calculator: estimate appliance electricity consumption and cost from watts, hours, duty cycle, and rates.

How this tool works

All results depend on user-entered assumptions. Use current local tariffs, system specifications, and professional estimates for decisions.

Worked example

Enter representative inputs, review the result, and adjust assumptions to compare scenarios.

Frequently asked questions

What does this calculator estimate?

It provides an assumption-based planning estimate using the inputs shown on the page.

Should I use regional defaults?

Use current local rates and provider quotes whenever possible; undated averages can mislead.

Are taxes and fixed charges included?

Only if you include them in the entered rates or costs. Utility tariffs and fees vary.

Can prices change?

Yes. Electricity, fuel, public charging, and equipment costs can change over time.

Is this a quote or engineering analysis?

No. It is an educational estimate and not a purchase quote, design, or professional advice.

What should I verify next?

Confirm assumptions, local rates, equipment specifications, incentives, and installer or utility requirements.

Quick reference

Appliance	Typical Wattage	Monthly Cost at $0.15/kWh
Refrigerator	150 W (running)	~$16
Air conditioner (window)	1,200 W	~$54 (8h/day)
TV (55" LED)	100 W	~$5 (4h/day)
Dryer	3,000 W	~$27 (6 loads)
Gaming PC	450 W	~$20 (4h/day)

power Appliance breakdown

Every device priced.

sort Biggest offenders first

Find what to switch off.

lightbulb Pro tip

Kill vampire loads.

lightbulb Worked example

Auditing a 100 W TV used 5 hours/day at $0.15/kWh.

Result: The TV costs about $27.38 per year — and every device adds up.

Formula & methodology

Formula: Daily Cost = (Wattage ÷ 1000) × Hours Used × Electricity Rate per kWh. Monthly Cost = Daily Cost × Days in Month. Annual = Daily Cost × 365.

How appliance cost is calculated

The tool applies cost = wattage ÷ 1,000 × hours × rate for each appliance, then sums the daily figures and scales them to monthly and yearly totals. Enter the wattage from the nameplate (or amps × volts) and your average daily usage.

Example: a 1,500 W space heater for 4 hours at $0.15/kWh costs 1.5 × 4 × 0.15 = $0.90 per day, about $27 monthly.

Reading the result: the appliance-by-appliance breakdown shows where the bill really goes — heating, cooling, water heating, and the fridge dominate, while standby devices add a silent 5–10%. Modeling usage changes shows the savings potential of each efficiency upgrade before you invest.

Authoritative source: https://www.energy.gov/energysaver/estimating-appliance-and-home-electronic-energy-use

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