Film-Build Calculator

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Coverage rate sq ft per litre

Solids % by volume

Target dry film thou — optional

Spray panel width in — optional

Spray fan width in

Pass overlap %

Enter the coverage rate and solids percentage, then press Calculate.

From the book — Chapter 9. Wet film (thou) = 423.8 ÷ coverage (sq ft/L). Dry film per coat = wet × solids%. Coats to a target = target ÷ dry-per-coat, rounded up.

Spray-pass count: ⌈(panel width − fan width) ÷ (fan width × (1 − overlap))⌉ + 1. Everything stays in your browser — no sign-up, nothing stored.