Render and Paint: Bags, Coats and Gallons

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Opens on the book's own wall. Change any number to your own and press Calculate.

Wall length m

Height to render m

Wall thickness m

Render the ends

Base coat covers ft² per bag at ⅜ in (20–24)

Waste on base coat %

Finish coat covers ft² per bag at ⅛ in

Paint covers m² per liter, per coat

Coats

Base coat price

Finish coat price

Paint price per gallon

Enter the wall and press Calculate.

From the book, Chapter 8. The book renders 11.761 m² (126.59 ft²): 7 bags of base coat at ⅜ in with 10% waste, 2 bags of finish coat at ⅛ in (½ in in all), and 2 gallons of paint for two coats at 4 m² per liter.

Coverage is on the bag and the can, and rough render drinks paint: textured surfaces can take two to three times what a smooth one does. Let new render cure before painting; one paint maker asks for 30 days. Prices are illustrative US home-center prices from October 2026, shown without a currency sign; put in your own. Everything stays in your browser: no sign-up, nothing stored.