There is no software available that can measure entire PC's power consumption.
Since PSU doesn't communicate with the MoBo on software basis, there is no way for a software to read how much power PSU outputs at any given time.
At best, you can monitor the voltages of MoBo, CPU , GPU and RAM but that's about it what software can do. And it isn't always accurate either.
HWinfo64 has voltage monitor among other sensors, with the ability to record (log) the sensor statistics,
link:
https://www.hwinfo.com/download.php
Your best bet would be using Kill A Watt or similar electricity usage monitor,
amazon:
https://www.amazon.com/P3-International-P4400-Electricity-Monitor/dp/B00009MDBU
Just plug the extension cord into electricity usage monitor and electricity usage monitor into the mains. This way, the electricity usage monitor will show the entire combined load for each application connected to the extension cord.