Paint Calculators

Estimate paint quantities, coverage, costs, and materials for interior and exterior painting jobs. Built for painters, renovators, and DIYers who need accurate estimates without waste or extra trips to the supplier.

Paint Tools

Which Calculator Should I Use?

I want to… Use this calculator
Calculate how many litres of paint I need Paint Coverage Calculator
Calculate paint for walls specifically Wall Paint Coverage Calculator
Calculate paint for ceilings Ceiling Paint Coverage Calculator
Generate a complete quote for a painting job Painter Quote Price Calculator
Estimate painter labour costs Painter Labour Cost Calculator

Who These Paint Tools Are For

  • Professional Painters — quote accurately and order the right amount of paint first time
  • Builders & Renovators — calculate paint for new builds and renovation projects
  • Property Managers — estimate paint costs for rental property turnovers
  • DIY Homeowners — avoid buying too much or too little paint for your project

How to Use These Calculators for a Real Job

  1. Start with the Paint Coverage Calculator to calculate how many litres you need based on wall area and number of coats.
  2. Use the Wall Paint Coverage Calculator and Ceiling Paint Coverage Calculator separately for more accurate results.
  3. Add 10% waste for touch-ups, spills, and future repairs.
  4. Generate your quote using the Painter Quote Price Calculator.
  5. Don’t forget supplies — brushes, rollers, tape, drop sheets, and primer all add to the job cost.

💡 Pro Tips from Tradies

  • Always add 10% extra — for touch-ups, mistakes, and future repairs. Batch numbers vary, so buying extra upfront ensures colour match.
  • Two coats minimum — one coat rarely covers properly, especially on new plaster or dark colours. Always factor in two topcoats for quotes.
  • Primer is not optional — new plaster, bare timber, and drastic colour changes need primer. It improves adhesion and saves topcoat paint.
  • Check coverage rates — cheap paint covers less (8–10m²/L), quality paint covers more (12–14m²/L). Factor this into your cost calculations.
  • Don’t forget ceilings and trim — calculate these separately, they often need different paint and sheen levels.
  • Measure walls accurately — subtract windows and doors, but keep a buffer for reveals and corners.

Paint Job-Specific Quick Tips

🏠 Interior Painting

  • Paint ceilings before walls to avoid roller spatter on finished walls
  • Cut in before rolling — use a brush for edges and corners first
  • Maintain a wet edge to avoid lap marks and uneven finish
  • Good brushes and rollers give better finish and save time
  • Fill holes, sand rough spots, clean walls before painting

🏡 Exterior Painting

  • Don’t paint in direct sun, rain, or temperatures below 10°C
  • Pressure wash first — remove dirt, mould, and loose paint
  • Any exposed timber needs primer to prevent bleed-through
  • Use exterior-grade UV-resistant paint for temperature changes

🎨 Sheen Level Guide

  • Flat / Matt: Ceilings, low-traffic areas — hides imperfections
  • Low sheen: Living rooms, bedrooms — easy to clean
  • Satin / Semi-gloss: Kitchens, bathrooms, trim — durable and washable
  • Gloss: Doors, skirting boards, architraves — durable, high shine

Common Paint Calculation Questions

How much paint do I need per square meter?

One litre of quality paint covers approximately 10–14m² per coat. Coverage depends on paint quality, surface texture, colour change, and application method. Use the Paint Coverage Calculator for accurate estimates based on your specific project.

How do I calculate wall area for painting?

Measure wall length × height to get square meters per wall. Add all walls together, then subtract areas for windows (1–2m² each) and doors (1.5–2m² each). Example: 4m × 2.4m = 9.6m² per wall × 4 walls = 38.4m² minus 2 windows and 1 door = approximately 33m².

How much primer do I need?

Primer coverage is similar to paint (10–14m²/L) but usually only one coat is needed. Use primer on new plaster or drywall, bare timber, drastic colour changes, and stained or porous surfaces.

How much does professional painting cost?

Interior painting typically costs $25–$45 per hour or $3–$6 per m² for labour. A full room (4 walls + ceiling) runs $300–$800 including paint. Exterior houses range from $2,000–$8,000 depending on size and condition. Use the Painter Quote Price Calculator to build accurate quotes.

Why Getting Paint Estimates Right Matters

Paint is expensive and colour matching is critical. Under-order and you risk batch variations or project delays. Over-order and you’re storing leftover paint. Accurate estimates help you:

  • Avoid batch number mismatches — buy all paint at once
  • Quote accurately with correct material costs
  • Minimise waste and protect your profit margin
  • Have extra paint on hand for touch-ups and future repairs