Quality Inspector
Painting & Finish
House Paint Calculator (2026) – Interior & Exterior Estimator
Expert Guide
Professional Interior & Exterior paint, wall putty, and primer estimator with labor costs.
⚡ Quick Answer
For a standard 12x10 ft room in Nepal (2 coats), you typically need 6-8 litres of paint. A premium finish requires 2 coats of putty, 1 coat of primer, and 2 coats of emulsion. For professional painting quotes, visit pro.nirmansutra.com.
🛠️ How It Works
- •Choose Interior for rooms or Exterior for outer façades.
- •Enter total area or room dimensions. Room mode automatically applies a 15% opening deduction.
- •Select the paint grade (Economy to Weather-Guard).
- •The tool calculates Putty and Primer based on a standard two-coat preparation cycle.
- •Review the labor budget based on current Nepal market regional rates.
📐 Calculation Formula
Gross Area = 2H × (L + W) + Ceiling Area
Net Paint Area = Gross Area - 15% (Openings)
Paint Litres = (Net Area / Coverage per Litre) × Coats
📋 Real-Life Example
Example: Interior Painting for a 200 m² total surface area.
1. Total Area = 2,152 sq.ft.
2. Paint (Standard Emulsion) = 2,152 / 80 (sq.ft/L) ≈ 27 Litres.
3. Putty (2 coats) = 2,152 / 18 (sq.ft/kg) ≈ 120 kg.
4. Labor Cost (@ Rs. 12) = 2,152 * 12 = Rs. 25,824.
⚠️ Common Mistakes to Avoid
- ✕Assumed same coverage for exterior as interior. Rough exterior plaster consumes 25-30% more paint than smooth interior surfaces.
- ✕Failing to apply primer on new putty — this causes the final paint layer to peel or "chalk" within 12 months.
- ✕Ignoring ceiling area when calculating interior paint — always add (Length × Width) to your total area estimate.
🔍People Also Search / यो Calculator मा अक्सर खोजिने कुराहरू
Asian Paints vs Berger price list Nepal 2026 update
How to calculate wall putty requirement for home
Exterior weathercoat painting cost per sq ft 2026
Paint coverage area per litre for different wall surfaces
Ghar ko kotha painting garne kharch ko hisab
Paint aur putty ka rate 2026 Kathmandu
Wall primer vs Wall putty: application sequence guide
Interior home painting color combinations 2026
Best exterior house paint for heavy rainfall Nepal
पेंट और पुट्टी का रेट २०२६
❓ Frequently Asked Questions
For a standard 12x10 ft room (approx 350 sq.ft wall area), you typically need 4-5 litres of paint for 2 coats, plus 10-15kg of putty for wall preparation.
For exteriors, "Weather-Guard" or "Apex" grade emulsion is best to withstand heavy monsoon rain. For interiors, "Premium Emulsion" provides a washable and durable finish.
In 2026, labor rates for interior painting range from NPR 10 to 18 per sq.ft, depending on whether it includes putty and primer application.
Stop Guessing.
Start Building.
- ✕Square Feetको भ्रममा नफस्नुहोस्।(Don't get trapped in "Square Feet" rate illusions.)
- ✓Save up to 11% on materials with an accurate BOQ.
Worth NRs. 5,000
NRs. 999 🎯
Get Expert EstimateLimited Time Launch Price