1500 W heater for 3 hours: energy and cost
A complete calculation from 1500 W and 3 hours to 4.5 kWh per use, 135 kWh in 30 days, and cost at 0.25 EUR/kWh.
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Two complete examples show a power-and-time calculation and a known-energy calculation without hiding intermediate values.
Known 0.12 kWh per use: calculate the running cost
Use measured 0.12 kWh per cycle and 0.22 per kWh to calculate 3.6 kWh and 0.792 in 30 days.
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