Progetti Interni

Calcolatore Resa Pittura

Hai barattoli di pittura avanzati? Calcola la superficie esatta di parete che puoi coprire considerando il tipo di intonaco o muratura, gli strati di pittura e lo sfrido del rullo.

⚡ Quick Dimensional Presets:

Misure del Progetto

Inserisci le dimensioni per calcolare i materiali necessari

Paint Quantity(gal)

Volume of paint available or to purchase

Manufacturer Coverage Rate(sq ft/gal)

Standard interior latex is 350–400 sq ft/gal (9–10 m²/L)

Number of Coats

Two coats provide maximum durability and true color depth

Surface Texture & Porosity

Porous surfaces absorb more liquid on the initial coat

Roller Nap & Waste Buffer

Accounts for paint retained in roller covers and trays

2D DRAFTING PLAN12 FT × 10 FT (120 SQ FT)

Inserisci le misure sopra per visualizzare il risultato.

Esempio di Calcolo Dettagliato

Scenario: Calculating finished coverage for 2 gallons of premium interior latex paint applied in 2 coats over standard smooth drywall with a 10% roller buffer.

Determine Gross Single-Coat Capacity: 2 gallons × 350 sq ft/gallon = 700 sq ft.

Apply Surface Porosity: 700 sq ft × 1.0 (smooth drywall) = 700 sq ft.

Deduct 10% Waste Buffer: 700 sq ft × (1 - 0.10) = 700 × 0.90 = 630 sq ft usable coverage.

Divide by 2 Coats: 630 sq ft ÷ 2 coats = 315 sq ft of finished room wall area.

Result: 2 gallons of paint will fully cover 315 sq ft (29.3 m²) of wall area with 2 complete coats, enough for a standard 10×10 ft or 10×12 ft bedroom.

Paint Coverage & Surface Capacity Formula

Finished Coverage = [Paint Quantity × (Coverage Rate × Surface Multiplier) × (1 - Waste%)] ÷ Number of Coats

Gross single-coat coverage is calculated by multiplying paint volume by the effective coverage rate (base rate modified by surface texture porosity). A safety buffer (default 10%) is subtracted for roller nap absorption and tray residue. Dividing by the target number of coats yields the net finished room surface that can be fully painted.

Variabili della Formula

Q — Paint Quantity (Gallons or Liters)

R — Base Manufacturer Coverage Rate (e.g. 350 sq ft/gal or 10 m²/L)

M — Surface Porosity Multiplier (0.60 to 1.05)

W — Waste & Roller Absorption Buffer (e.g. 10%)

N — Number of Finished Coats (1, 2, or 3)

A_{finished} — Finished Wall Surface Covered

Ipotesi di Calcolo

Premium interior latex paint on smooth primed drywall covers approximately 350 to 400 sq ft per gallon (8.6 to 10 m² per liter).
Unprimed drywall and bare wood absorb 20% to 25% more paint on the initial coat.
Highly porous surfaces like brick, masonry, and stucco reduce effective coverage by 35% to 40%.
A standard 10% waste buffer is factored in for roller nap retention, cutting waste, and edge touch-ups.

Trade FAQ

Domande Frequenti

Risposte alle domande più comuni sul fai-da-teCalcolatore Resa Pittura

How much wall area does 1 gallon of paint cover?

One standard US gallon of interior latex paint covers approximately 350 to 400 square feet with a single coat on primed drywall. For a standard 2-coat application, 1 gallon will cover 175 to 200 square feet of wall area (such as a small bathroom or accent wall).

How much wall area does 1 liter of paint cover?

One liter of interior wall paint covers approximately 9 to 11 square meters (m²) with a single coat on smooth surfaces. Applying two coats will cover approximately 4.5 to 5.5 square meters per liter.

Do I really need 2 coats of paint, or is 1 coat enough?

One coat is only sufficient if you are refreshing an existing wall with the exact same color and sheen. Two coats are strongly recommended for all other scenarios to achieve uniform sheen, true color depth, full hide, and washability.

How does surface texture and porosity affect paint coverage?

Smooth, previously painted walls require the least amount of paint. Rough textures, unprimed drywall, bare wood, and porous masonry absorb significant moisture, reducing coverage by 20% to 40% on the first coat.

How much paint covers a standard 12x12 bedroom?

A 12x12 bedroom with 8-foot ceilings has approximately 384 gross square feet of wall area (roughly 335 sq ft after deducting 1 door and 2 windows). Applying two coats requires approximately 2 gallons of paint.

Does paint primer have the same coverage as topcoat paint?

Drywall primer covers roughly 250 to 300 sq ft per gallon because it is formulated to seal porous paper and joint compound. Applying primer first prevents your more expensive topcoat paint from soaking into the wall.

How long can leftover paint be stored for future use?

Unopened latex paint can last up to 10 years. Leftover paint that is tightly sealed in an airtight container and stored in a cool, dry place (preventing freezing) will typically remain usable for 2 to 5 years.

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