How Much Paint Do I Need? — Complete Guide for Philippine Homeowners (Free Calculator)

Whether you're repainting a bedroom, refreshing your home exterior, or painting a commercial space, calculating the right amount of paint is essential. Buy too little and you risk a mismatched second can from a different batch. Buy too much and you've wasted money on paint that sits unused. This guide explains exactly how to calculate paint requirements for any surface in the Philippines.

The Basic Paint Calculation Formula

Paint coverage = total paintable area ÷ coverage rate per liter × number of coats. For a standard room: Total area = 2 × (length + width) × height for the walls. Coverage rates vary by paint type and surface texture: flat/matte paint covers approximately 12 sqm per liter, semi-gloss covers 10 sqm/L, gloss covers 9 sqm/L, and elastomeric waterproof paint covers 14 sqm/L.

Philippine Paint Brands and Prices (2026)

• Boysen (most popular): Flat latex ₱180–₱250/L, Permacoat semi-gloss ₱220–₱300/L
• Davies: Semi-gloss ₱200–₱280/L, Weathercoat exterior ₱350–₱450/L
• Nippon Paint: Premium interior ₱350–₱500/L, EX exterior ₱420–₱580/L
• Bench Coat Primer: ₱150–₱200/L — always use primer on new surfaces
• Elastomeric (Davies, Boysen): ₱400–₱600/L — for roofs and exterior waterproofing

Number of Coats Needed

Most surfaces need 2 coats for proper coverage and durability. New, unpainted surfaces (fresh concrete, plaster) should always have 1 coat of primer first, then 2 coats of topcoat. Dark colors going over light require 2–3 coats. Light colors going over dark require 3+ coats or a white primer base first.

Paint Quantities Reference Chart

• Small bedroom (3m × 3m × 2.7m walls): ~9 sqm → ~3.5L for 2 coats
• Master bedroom (4m × 4m × 2.7m): ~15 sqm → ~5.5L for 2 coats
• Living room (5m × 4m × 2.7m): ~20 sqm → ~7L for 2 coats
• Standard ceiling (4m × 4m): ~16 sqm → ~4L for 1 coat
• Exterior house (100 sqm house footprint): ~200–300 sqm → ~70–100L for 2 coats