🧱 Paint & Sealer Calculator – User Guide

This tool helps you estimate how much paint and sealer you need based on real wall measurements, with deductions for doors and windows.

📏 1. Unit Selection

Choose the unit you are using for measurements:

• Feet (ft) → common for room measurement

• Meters (m) → metric system

The calculator will automatically convert everything into a consistent system before calculation.

📐 2. Wall Measurement

Wall Length

Enter the full horizontal length of the wall.

Wall Height

Enter the height from floor to ceiling.

The tool calculates:

Wall Area = Length × Height

🚪 3. Door & Window Deduction

To improve accuracy, you can subtract openings.

Doors

Enter:

• Number of doors

• Width of each door

• Height of each door

Windows

Enter:

• Number of windows

• Width of each window

• Height of each window

🧮 4. Net Painting Area

After deductions:

Net Area = Wall Area − Doors − Windows

If the result becomes negative, it will automatically be set to zero.

🎨 5. Paint Calculation Standard

This calculator uses a fixed real-world estimate:

5L covers 300 ft² for 2 coats

Which simplifies to:

1L covers 60 ft² (including 2 coats)

This means you do not need to manually enter coat numbers.

🧴 6. Sealer Calculation

Sealer is automatically estimated using:

Sealer Required = Paint Required ÷ 2

This is a standard estimation method used in basic project planning.

⚠️ Important:

• Sealer needs may vary depending on wall condition

• Highly porous or new cement walls may require more sealer

💧 7. Waste Factor

This accounts for real-world losses such as:

• roller absorption

• spills

• uneven surfaces

Recommended:

• 1.1 = 10% waste (default)

• Increase for rough or unprimed surfaces

🧮 How the calculation works

Step 1: Wall area

The calculator multiplies:

Wall Area = Length × Height

Step 2: Paint standard used

This tool uses a fixed real-world benchmark:

5L covers 300 ft² for 2 coats

Which means:

1L covers 60 ft² (2 coats included)

Step 3: Paint estimation

The calculator estimates:

Paint Needed = Wall Area ÷ Coverage × Waste Factor

Step 4: Can rounding system

After calculating the exact amount, the tool recommends paint cans in:

• 18L

• 15L

• 5L

• 1L

It always:

• Uses larger cans first

• Minimizes leftover waste

• Ensures you never under-buy