Explanation

Many electricity meters have a readout that says something like:

• 7'000 revolutions per kWh (a disk revolving)
• 10'000 pulses per kWh (a flashing light, perhaps infrared)

On this page, I call them beats (revolutions, pulses, whatever).
Below, you can calculate the current power draw using these beats, plus some extrapolations that you might (not) want.

Tips:

• Use your phone camera to see infrared pulses (most of the time).
• Use split-screen mode to see both the camera and this website at the same time (it depends per Android version how to do this).

Calculator

Beats per kWh:
BPM:



Watts:
kWh per day: / per year:
Hours for 1 kWh: