Paint Calculator

Liters and buckets from area and coats

Quick Answer

Paint Calculator: Liters and buckets from area and coats. Paint Calculator uses standard science & engineering formulas to compute accurate results instantly.

Wall perimeter (sum of wall lengths)

Wall height

Doors & windows area to deduct

㎡

Coats

coats

Coverage rate

㎡/L

Paint type:

Paint needed

6.2 L

≈ 2 × 5L cans or 1 × 18L bucket (with 8% margin: 6.7 L)

Calculation steps

1Gross wall area: 16 × 2.7 = 43.2 m²
2Minus openings: 43.2 − 6 = 37.2 m²
3× 2 coats = 74.4 m² to cover
4Liters = 74.4 / 12 = 6.20 L

Net wall area37.2 ㎡

With coats74.4 ㎡

Paint needed6.2 L

With 8% margin6.7 L

Quick room reference (2.7 m ceiling, 2 coats, latex)

Room	Wall area	Paint
Bedroom 3×4 m	14×2.7−6	5.3 L
Living room 5×6 m	22×2.7−10	8.2 L
Kitchen 2×3 m	10×2.7−4	3.8 L
Whole flat 100 m² (walls only)	≈250 m²	41.7 L

Rough or unpainted surfaces (new plaster, dark colors covered by light) need primer first and may cut coverage by 20–30%. Ceiling area = room floor area; add it separately if painting the ceiling. Real coverage is printed on the can — it varies widely by brand and color (deep colors cover worse).

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How to Use

Enter known quantities: fill values and confirm units in the Paint Calculator.
Instant solution: unknowns solve live with the formula shown transparently.
Use constant/material tables: standard physical constants and material data are listed on this page.
Compare conditions: change inputs to compare scenarios.

Key Points

Paint Calculator is a free online science & engineering tool — open and use, no sign-up.
All calculations run locally in your browser; your data never leaves the device.
Key capability: Liters and buckets from area and coats.
Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Paint Calculator formula

Paint Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Paint Calculator?

Open the page and fill in the input fields — results update automatically. Liters and buckets from area and coats.

Are the results accurate?

Yes. Standard formulas and conversion factors are used and verified.

Is it free? Do I need to sign up?

Completely free. No registration, login or download required.

Does it work on mobile?

Yes. The responsive design works on phones, tablets and desktops.

Is my data saved?

No. Everything runs locally in your browser.

Related Guides

Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated: 2026-08-04

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Cite this page: YiJianSuan. Paint Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/paint-qty

Results provided by this tool are for reference only and do not constitute professional advice.

Quick room reference (2.7 m ceiling, 2 coats, latex)

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How to Use

Key Points

Formula & How It Works

FAQ

Related Tools

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Source & Updates

Quick room reference (2.7 m ceiling, 2 coats, latex)