Global Settings
days
My Appliances
Calculation Results
Add an appliance and details above to see your estimated costs here.
30-day Energy Used
0.00kWh
30-day Total Cost
0.00USD
Energy Distribution
Appliance Breakdown
| Appliance | Power | Usage (h/d) | Daily (kWh) | 30-day (kWh) | 30-day Cost |
|---|---|---|---|---|---|
| Total | — | — | — | — | — |
Cost Projections
Daily Cost—
30-Day Period Cost—
Estimated Monthly Cost (×30)—
Estimated Yearly Cost (×365)—
Typical Wattage Reference
| Appliance | Typical Power Range |
|---|
Brand, model, and operating modes (like inverter or standby) significantly affect actual power draw. Use these as rough guidelines.
How to use
- Enter your local electricity rate and desired billing period (e.g., 30 days).
- Add your appliances: give them a name, input their wattage (W or kW), and estimate how many hours they run per day.
- The calculator updates instantly. Scroll down to see the visual breakdown and detailed table.
- Your data is automatically saved locally in your browser for your next visit!
FAQ
Absolutely. This tool runs 100% locally in your web browser. No data is ever sent to a server. We use HTML5 Local Storage purely so you don't lose your appliance list if you close or refresh the page.
It provides a solid baseline estimate. Actual costs may vary due to tiered utility pricing, seasonal variations, and modern appliances (like inverter ACs or smart fridges) modulating their power usage instead of running at peak wattage constantly.
Check the manufacturer's sticker or label usually found on the back, bottom, or inside the door of the appliance. Alternatively, look at the power brick or the user manual.