What you actually have to charge per hour
Most owner-operators set their rate by looking at what the competition charges. The useful version is arithmetic: your fixed costs and the pay you want, divided by the hours you can actually bill.
Result
This is the floor, not the price. It is the number below which the year does not work, before material and before any job going badly.
Questions
Why not 2,080 hours a year?
Because nobody bills 2,080. Take out holidays, sick days, weather, travel between jobs, estimating time and the gaps between jobs — 1,200 to 1,500 is realistic for most crews.
Is the rate what I charge customers?
It is the minimum your billable hours have to produce. What you charge should be above it, and material and subcontract costs are on top.
Or stop doing this in a calculator
Aerys prices the whole job from your own catalog and production rates, sends it with an accept link and an invoice already attached, and then tracks what the job actually cost against what you quoted.