Repairs & renovations

Paint Quantity & Cost Calculator

Estimate wall area, litres required and paint cost. Adjust every assumption to match your project.

What this calculator estimates

Estimate paint required from room dimensions. It combines the inputs below to produce Estimated paint cost. Every assumption remains editable so the estimate can reflect the property, financing and location being evaluated.

Worked example

Using the displayed sample assumptions, the calculator produces $162. This is an illustration, not a market quote. Change one input at a time to understand what drives the result.

Inputs and assumptions

• Room length — sample input: 14 ft
• Room width — sample input: 12 ft
• Wall height — sample input: 8 ft
• Number of coats — sample input: 2 coats
• Coverage per litre — sample input: 100 sq. ft.
• Cost per litre — sample input: 18 currency units

How to interpret the result

Replace sample unit prices with current local quotes. Compare a conservative case with an expected case and keep a record of the assumptions used.

Common mistake to avoid

Do not omit demolition, permits, tax, delivery or contingency. Local definitions, taxes, lending practices and measurement requirements can materially change the result.

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Reviewed 2026-09-08.