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Calculate total paint cost from quantity and price per liter or gallon. Includes waste factor and multi-coat calculations with itemized cost breakdown.
Part of the Surfaces & Finishes calculators — see all tools in this category.
This calculator estimates total paint cost from quantity and price, applying coats and waste factor with integer-cents arithmetic for precise results.
Formula: Total Volume = Quantity × Coats × (1 + Waste %). Total Cost = Total Volume × Price per unit.
All cost arithmetic uses integer cents to avoid floating-point rounding errors common in dollar calculations.
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Volume of paint for one coat of the surface area
1–4 coats (2 is typical)
Typical waste is 10% for roller/brush application
Price per liter of paint (e.g., $4.50/L)
| Line Item | Qty | Unit | Rate | Subtotal |
|---|---|---|---|---|
| Base Paint (2 coats) | 20 | L | $90.00 | |
| Waste (10%) | 2 | L | $9.00 | |
| Contingency (0%) | $0.00 | |||
| Total | $99.00 |
2 coats + 10% waste
at $4.50/L