Electricity Cost Calculator
Enter watts, daily hours and your per-kWh price to see daily and monthly running costs.
How Electricity Cost Calculator works
Estimate what an appliance costs per day and per month from its wattage. Enter watts, daily hours and your per-kWh price to see daily and monthly running costs. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.
That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.
Watts to kilowatt-hours
A 1,500 W appliance running four hours uses 1,500 ÷ 1,000 × 4 = 6 kWh a day. At 55 per kWh that is 330 a day, or about 9,900 a month.
The division by 1,000 is the step people skip: a watt is a rate, a kilowatt-hour is an amount, and the bill charges for the amount.
Which appliances actually cost money
Heating and cooling dominate because they run for hours at high wattage. A 2,000 W heater for six hours is 12 kWh a day; a 60 W fan for the same time is 0.36 kWh — a factor of 33.
| Appliance | Watts | 4 h/day | Monthly at 55/kWh |
|---|---|---|---|
| Fan | 60 | 0.24 kWh | ≈ 400 |
| Fridge (compressor average) | 150 | 0.6 kWh | ≈ 990 |
| Air conditioner | 1,500 | 6 kWh | ≈ 9,900 |
| Water heater | 2,000 | 8 kWh | ≈ 13,200 |
Why the bill is higher than the maths
Fixed charges, meter rent, taxes and slab-based tariffs where the rate rises with consumption. A unit that costs 55 at low usage can cost far more once you cross into the next slab — which is why reducing usage can save disproportionately.
Good to know
- Works offline once loaded, including on flights and in locked-down networks.
- No file size limit beyond your device's own memory.
- Free to use, with no account and no usage counter.
- Results are produced locally, so they are not logged or shared with anyone.
Questions
Is anything uploaded when I use Electricity Cost Calculator?
No. The calculation runs in your browser with JavaScript, so the values you enter never leave your device.
What should I check before relying on the result?
Enter watts, daily hours and your per-kWh price to see daily and monthly running costs. Treat the output as an estimate and verify anything critical independently.
Is the wattage on the label the real consumption?
It is the maximum. A fridge cycles, so its average draw is much lower.
Does it handle multiple appliances?
One per calculation; add the monthly figures together.
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