Extrapolate Energy Costs

Simple calculator for estimating the electrical energy costs for a certain amount to generate or consume. Simply enter a price for a unit of energy, as well as power and time or the energy to be calculated or the energy costs.
The factor is used to multiply the running time, for example to calculate the costs for 10 days from the costs for one day.

Energy price:		cents per WhkWhMWhGWh
Power:		WkWMWGW
Time:	d h m s
Energy:		WhkWhMWhGWh
Energy costs:		€ or $

Multiplied with the factor : € or $

Example: the generally cheapest form of energy is solar power from photovoltaic ground-mounted systems. If such a device can generate electricity for 5 cents per kilowatt hour (kWh), then the costs to generate 75 megawatt hours (MWh) are 3750 $.

Example 2: If you run the kettle at 2000 watts for 5 minutes, then with an electricity price of 35 cents per kilowatt hour it costs around 6 cents. If you do this for a month (30 days), you'll have to pay $1.75.

Extrapolating energy costs over a longer period of time is always associated with inaccuracies. When energy is generated, the yield naturally fluctuates. In the case of photovoltaics in particular, but also for wind power and hydropower, this yield is seasonal, so the values ​​for comparison and extrapolation should always refer to full years. Or it should only be a few days, which should then be as close together as possible and have similar weather conditions. Similar difficulties arise with energy consumption, as many devices do not run around the clock, but at different and alternating times, and many devices do not have a constant energy consumption, but this can fluctuate over time and depending on utilization. With PCs and laptops, for example, the power requirement depends very much on the tasks they have to perform and how computationally intensive these are.

Last updated on 06/30/2025. Author: Jürgen Kummer

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