Paint Cost Calculator

Estimate how much paint you need and what it might cost for a rectangular room. Enter dimensions in meters, number of coats, and price per liter. Results are a planning guide—not a professional takeoff.

Paint Cost Calculator

Planning a paint project

Most interior jobs need two coats for even color, especially when covering a darker shade. Ceilings, closets, and accent walls change the total area—this tool assumes you paint all four walls plus the ceiling in one color.

Prep work (cleaning, patching, sanding, taping) affects how much paint actually covers. Check the coverage figure on your paint can and round up when ordering.

How This Calculator Works

1

Enter room size

Length, width, and height define the wall and ceiling surface area.

2

Apply coverage math

Total area × coats ÷ 10 m²/L gives an approximate liter count.

3

Multiply by price

Liters × cost per liter produces a rough materials budget.

About Paint Cost Calculator

This tool totals wall and ceiling square meters, subtracts a standard door and window opening, applies your coat count, and converts to liters using 10 m² per liter. All math runs locally in your browser.

Walls + ceiling

Four walls and ceiling area from your room dimensions.

Fixed openings

One standard door and window subtracted from wall area.

Estimate only

Coverage varies by product—verify on the label before buying.

How to Use This Tool

1

Measure the room

Enter length, width, and height in meters.

2

Set coats

Choose how many coats you plan to apply (often two for a color change).

3

Enter paint price

Add your local cost per liter from the store or online listing.

4

Calculate

Review wall area, total painted area, liters needed, and estimated cost.

Pro Tips

  • Buy 10–15% extra paint for touch-ups and uneven surfaces
  • Use primer when covering dark colors or bare drywall
  • Test a sample patch in your room lighting before buying bulk
  • Flat paint often covers better than high-gloss on large walls
  • Ventilate the room and follow the manufacturer dry-time between coats

Frequently Asked Questions

How does this calculator estimate paint needed?
It calculates wall area from room length, width, and height (four walls), subtracts a fixed allowance for one standard door and one window, adds ceiling area, multiplies by your number of coats, and divides by a default coverage of 10 square meters per liter.
Why are dimensions in meters?
The tool uses meters for room size and liters for paint volume. If you measure in feet, convert to meters first (1 foot ≈ 0.305 meters). Coverage and pricing should match the units on your paint can label.
Does this account for primer or textured walls?
No. Primer, rough surfaces, dark-to-light color changes, and porous drywall often need extra coats or more paint than a smooth, primed wall. Buy a little extra rather than relying on this as an exact order quantity.
How accurate is the coverage rate?
Real coverage varies by paint brand, finish (flat vs gloss), application method, and surface. Labels often cite roughly 8–12 m² per liter for interior wall paint. This tool uses 10 m²/L as a middle estimate—check your product label.
Should I include trim, doors, or furniture?
This calculator covers walls and ceiling only. Trim, cabinets, and furniture need separate measurements. Moving furniture and taping edges also affect time and materials but are not included here.
Is this a quote from a paint store?
No. This is a free browser-based estimate for DIY planning. Always confirm quantities with your retailer and factor in sales tax, brushes, rollers, tape, and drop cloths separately.

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