My First Electricity Calculator

I have built my first online electricity calculator. It’s very simple and there are lots of similar calculators out there but it’s a start.

Behold: Electricity Calculator

Here’s how it works. Let’s say you are wondering how much it would cost to run a nightlight if you leave it on all the time. This nightlight has 0.2 watt LED, so you enter 0.2 as wattage.


Next you enter 24 as the number of hours per day. Here in Australia we pay 30 cents per kilowatt-hour on average. The calculator gives you the result: the running cost would be $0.53 per year.

Electricity Calculator

Another example. We have 6 light bulbs in our kitchen. They are CFLs (of course) and 14 watt each.


So in total they use 6 * 14 = 84 watt. We have them on for about 3 hours per day. We pay 40 cents per kilowatt-hour. According to the calculator the kitchen lighting cost us $3.02 per month or $36.79 per year.


2 thoughts on “My First Electricity Calculator

  1. This is great Pavel. Thanks!

    So, although my speakers are rate at 750 watts each, I doubt they are ever actually pulling that much power because most of the time they are on they are not playing anything. What I would like to have are smart outlets that turn things off when I’m not using them. There are some speakers out there that have a timer that turns them off automatically depending on audio input, but mine don’t have that feature.

  2. You are right, those are “acoustic watts”. If you want to know how much electricity your speakers use plug them into power meter.

Leave a Reply

Your email address will not be published. Required fields are marked *