Kmiainfo: How to calculate the total quantity of paint before starting the painting work

Customize the exact paint system + quantity calculation using a standard house example, and then tell you how to adjust it for your project.

🏠 ASSUMED PROJECT (Example)

A. Type: Residential house

B. Built-up area: 1,000 sq ft.

C. Interior wall area: ≈ 3 × built-up area = 3,000 sq ft.

D. Exterior wall area: ≈ 1,200 sq ft.

E. Condition: New plaster

F. Finish: Premium (long-lasting)

🎨 INTERIOR PAINT SYSTEM & QUANTITY ::---

✅ Paint System (Interior Walls)

1. White cement putty – 2 coats

2. Interior wall primer – 1 coat

3. Premium interior emulsion – 2 coats

📦 Quantity Calculation (Interior) :-

🔹 Wall Putty

A. Coverage: 12–15 sq ft/kg (2 coats)

B. Area: 3,000 sq ft

C. 👉 Required = 3,000 ÷ 13 ≈ 230 kg

D. ✔️ Order: 230–250 kg putty

🔹 Interior Primer

A. Coverage: 100 sq ft/liter/coat

B. Area: 3,000 sq ft

C. 👉 Required = 3,000 ÷ 100 = 30 liters

D. ✔️ Order: 30–35 liters

🔹 Interior Emulsion (2 Coats)

A. Coverage: 60–70 sq ft/liter (2 coats)

B. Area: 3,000 sq ft

C. 👉 Required = 3,000 ÷ 65 ≈ 46 liters

D. ✔️ Order: 45–50 liters

🏢 EXTERIOR PAINT SYSTEM & QUANTITY ::---

✅ Paint System (Exterior Walls) :-

1. Exterior crack filler (as needed)

2. Exterior primer – 1 coat

3. Weatherproof exterior paint – 2 coats

📦 Quantity Calculation (Exterior)

🔹 Exterior Primer

A. Coverage: 90–100 sq ft/liter

B. Area: 1,200 sq ft

C. 👉 Required = 1,200 ÷ 95 ≈ 13 liters

D. ✔️ Order: 15 liters

🔹 Exterior Weatherproof Paint (2 Coats)

A. Coverage: 50–60 sq ft/liter

B. Area: 1,200 sq ft

C. 👉 Required = 1,200 ÷ 55 ≈ 22 liters

D. ✔️ Order: 22–25 liters

🚪 DOORS, WINDOWS & METAL (Typical) ::---

Surface Quantity :-

A. Wood primer 4–5 liters

B. Enamel / PU paint 4–5 liters

C. Anti-rust primer (metal) 2–3 liters

D. Enamel for metal 2–3 liters

📋 TOTAL SUMMARY (1,000 sq ft House) ::---

Material Quantity :-

A. Wall putty 230–250 kg

B. Interior primer 30–35 L

C. Interior emulsion 45–50 L

D. Exterior primer 15 L

E. Exterior paint 22–25 L

⚠️ IMPORTANT ADJUSTMENTS :::---

A. Repainting (old house): Reduce putty by 40–50%

B. Dark colors: Add 10–15% extra paint

C. Rough walls: Increase paint by 10–20%

D. Textured paint: Coverage reduces by ~30%.