This calculator helps you estimate the total amount of paint required for your project. Just enter the total surface area, your paint's coverage rate, and the number of coats you plan to apply. The calculator accounts for wastage to give you a more accurate estimate.
Paint Calculator
Imperial (ft, gal)
Metric (m, L)
Estimated Paint Needed
0.00
Litres
How to Use This Calculator
- Select Your Units: Use the toggle at the top to switch between Metric (meters, litres) and Imperial (feet, gallons) systems.
- Enter Surface Area: Input the total area you need to paint. You can get this from our Wall Surface Calculator.
- Input Paint Coverage: Check your paint can for its coverage rate (e.g., m² per litre or ft² per gallon) and enter it here.
- Number of Coats: Specify how many coats of paint you will apply. Most projects require at least two.
- Account for Wastage: Add a wastage factor (10-15% is common) to account for spills, absorption, and other losses.
- View Your Result: The calculator instantly shows the total amount of paint you'll need for the job.
Disclaimer: This calculator tool is provided for informational purposes only. The results generated by this calculator are estimates and should be used as a general reference guide only. Calculations may not account for all variables, specific conditions, or professional requirements relevant to your particular situation. Results should not be relied upon as definitive advice or professional recommendations. Users are responsible for verifying all calculations and consulting with qualified professionals when necessary. The tool creators and contributors make no warranties, express or implied, regarding the accuracy, reliability, or suitability of the calculations for any specific purpose.
Paint Calculator
This tool helps you estimate how much paint you’ll need for your project. Just enter the area you want to cover, the coverage rate of your paint, and how many coats you plan to apply. The calculator includes a wastage allowance so you get a more accurate result.
How It Works
Using this calculator is simple:
- Select Your Units: Toggle between metric (meters, litres) and imperial (feet, gallons). The tool will adjust the input fields accordingly.
- Enter Surface Area: Type in the total area you need to paint. For example, if you’re painting a room, calculate the wall surface area using our Wall Surface Calculator.
- Input Paint Coverage: Check your paint can for its coverage rate (e.g., square meters per litre or square feet per gallon). Enter this value in the field.
- Number of Coats: Most projects need at least two coats. Enter 1 for a single coat, but usually 2 is standard.
- Account for Wastage: Add between 10%–15% to account for spills, absorption, brush loss, and uneven application. This helps avoid running out mid-project.
- View Your Result: The calculator instantly shows the total amount of paint you’ll need — in litres or gallons depending on your selected system.
What You Should Know
- The calculator does not include wall insulation or other special treatments.
- It assumes that all surfaces are flat and clean (no damage, no unevenness).
- For large projects like exterior walls or floors with complex shapes, consider adding extra to cover corners, edges, or irregular surfaces.
Tips for Accurate Results
- Always double-check your paint can’s coverage rate. Some paints claim 10–12 m²/L; others may go up to 20 m²/L.
- If you’re painting a room with multiple colours, use separate calculators per colour or add extra for each.
- For professional projects (e.g., construction), it’s safer to round up and buy more than the calculated amount.
Why This Calculator Is Useful
- Saves time and money: no need to guess how much paint you’ll need.
- Prevents buying too little — a common problem when underestimating.
- Helps plan your budget, especially for big projects like painting a house or garage.
- Works with any paint type (interior/exterior, gloss/mat) as long as the coverage rate is known.
Final Notes
This calculator gives you an estimate based on standard assumptions. For real-world accuracy, always account for real conditions: surface texture, paint absorption, and application method (brush vs. roller vs. spray). If in doubt, add 10–20% extra to your result.