Whole-Room Cost & Payback Calculator

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Materials total

Contingency %

Builder's quote

Currency symbol

Hours it took you

Hours a first-timer might take optional

Enter your materials total and the builder's quote, then press Calculate.

From the book — Chapter 11. Saving = builder's quote − materials total. Per-hour value = that saving ÷ the hours it actually took you.

Matches Chapter 11's full order sheet (659.00 materials, 2,850.00 quote, 2,191.00 saved) exactly. Everything stays in your browser — no sign-up, nothing stored.