 Batch Pricing Formula
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 Price = (Material + Labor + Overhead + Additional) × (1 + Reject%) ÷ (1 − Margin%) × Complexity Factor
 
 
 Walk In Parts or one off
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The formula behind the Quick Quote sheet works like this:
Price = MAX( (Cost per Piece ÷ (1 − Margin%)) × Quantity, Minimum Job Charge )
Where Cost per Piece breaks down into three components:
Cost per Piece = Labor + Overhead + Material

Labor = (Total Minutes per Piece ÷ 60) × Labor Rate ($/hr)
Overhead = (Total Minutes per Piece ÷ 60) × Shop Hourly Operating Cost ($/hr)
Material = Powder per Piece (lbs) × Powder Cost per Pound × Number of Coats

And Total Minutes per Piece is simply:

Prep Time = Stripping + Blasting/Cleaning + Masking + Outgas Bake
Application Time = (Spray + Cure + Inspect) × Number of Coats
Total Minutes = Prep Time + Application Time

So the margin is applied as a markup on your true cost (a 35% margin means your cost is 65% of the selling price), and the MAX function ensures you never quote below your shop minimum no matter how small the job is.
The sheet also calculates your Effective Hourly Rate Earned = Quoted Price ÷ (Total Minutes × Pieces ÷ 60), which is really useful for gut-checking whether a job is worth your time compared to other work you could be doing.