What KPI's are you using to measure your business?

So i hear a lot of influencers like Tommy Melo talk about these and I feel like the KPI's that actually matter in your specific business can vary a lot. For those of you who are tracking this what main ones are you using?

RIght now i"m doing:
Charge Rate - What are we actually making on the amount of time the guys are working

Average Job Size

Usage Rate for employees - out of how many available hours they have, how much am I scheduling them for