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Paint Quantity Calculator – Liters & Cans to Buy

Quick answer

This calculator converts measured wall area straight into shopping list: liters at 10-12 m²/L, rounded to real can sizes 1, 4 and 20 L with spare for touch-ups.

Figures are estimates from this calculator’s standard formula — adjust the inputs in the tool below for your exact number.

How does the paint quantity calculator work?

Liters = Area × Coats ÷ 10.5 (average emulsion)

Instead of working from a supplier's ballpark figure, this calculator derives your paint quantity requirement from Liters = Area × Coats ÷ 10.5 (average emulsion) using the exact total wall area and coat count you provide. The arithmetic stays transparent: each result links back to the displayed formula, so you can audit any number. For instance: 80 m² total, 2 coats: 80 × 2 ÷ 10.5 = 15.2 L - one 20 L drum beats four 4 L cans on price. Keep in mind: Keep 0.5 L of each color for future scuff repairs. Quantities are rounded conservatively so offcuts, spillage and delivery shortages never stop work mid-job.

  1. 1

    Take dimensions

    Note the total wall area and coat count for the area you are covering or filling.

  2. 2

    Run the calculation

    The calculator applies Liters = Area × Coats ÷ 10.5 (average emulsion) the moment you type.

  3. 3

    Check the breakdown

    Compare base quantity and waste-adjusted totals side by side.

  4. 4

    Plan the purchase

    Use the final figure to price and schedule the delivery.

Use Cases

Feature and accent walls

Compare paint quantity needs before committing to bold colors.

Rental turnover

Budget paint quantity quickly between tenant changes.

Wallpaper projects

Convert paint quantity area into rolls with pattern-repeat waste.

Common Mistakes

  • Buying exact liters

  • Skipping primer

  • Mismatched batch numbers

FAQs

How much paint for a 3-room apartment?

Roughly 180-220 m² of wall and ceiling - about 36-42 L for two coats, one 20 L drum plus six 4 L cans.

Liters for one accent wall 4 × 2.7 m?

10.8 m² × 2 coats ÷ 10.5 = about 2 L - one 4 L can covers it with primer spare.

Should ceilings be counted with walls?

Count them at 9-10 m²/L - ceiling paint flows differently; a 4 × 4 m room ceiling needs about 3.5 L for two coats.

How much extra for trim and doors?

One liter covers 40-45 m² of trim - plan 1-2 L of enamel per average room's skirting and doors.

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