Paint Calculator: Room & Wall

Paint Calculator: Room & Wall helps you estimate how much paint you need for walls, ceilings, single rooms and multi-room projects.

Enter your room dimensions and get a clear paint estimate in seconds. Calculate wall area, subtract doors and windows, choose the number of coats, set paint coverage and add an optional waste allowance. The app then shows the paint quantity, recommended cans and estimated cost.

PAINT CALCULATOR

Calculate paint for a rectangular room using length, width and wall height.

See:
• Gross wall area
• Door and window deductions
• Net paintable area
• Paint needed
• Number of coats
• Coverage per liter or gallon
• Waste allowance
• Recommended paint cans
• Estimated leftover paint
• Estimated cost

ROOM & WALL AREA CALCULATOR

Use the room estimator to calculate:
• Wall area
• Floor area
• Ceiling area
• Room perimeter
• Square meters
• Square feet

For irregular spaces, add individual walls separately instead of using a standard rectangular room.

DOORS & WINDOWS

Add doors, windows or custom openings and subtract their area automatically from the total paintable surface. Add quantities and custom dimensions for a more accurate wall paint estimate.

SINGLE WALL CALCULATOR

Need paint for only one wall or an accent wall? Enter the wall width and height, then calculate the paint required without creating a complete room.

CEILING PAINT CALCULATOR

Estimate ceiling paint separately using room length and width. Set different coats, coverage, waste and paint settings for the ceiling when needed.

MULTIPLE ROOMS

Create painting projects with multiple rooms such as:
• Living room
• Bedroom
• Kitchen
• Hallway
• Office

Review paint requirements for each room and the total project.

PAINT COVERAGE & COATS

Set the coverage shown on your paint container, such as square meters per liter or square feet per gallon. Choose one, two, three or a custom number of coats.

Actual paint coverage varies by product, color, surface and application method, so you can use the manufacturer's own coverage value.

PAINT CAN CALCULATOR

Choose a paint container size and calculate how many cans you need to buy. The app rounds physical paint cans up so you do not end up with a fraction of a can.

See:
• Paint quantity required
• Number of cans
• Total paint purchased
• Estimated leftover paint

PAINT COST ESTIMATOR

Add a price per can to estimate your project cost. Useful when comparing paint sizes or planning a renovation budget.

PRIMER CALCULATOR

Optionally calculate primer separately with its own:
• Number of coats
• Coverage
• Container size
• Price

METRIC & IMPERIAL UNITS

Use the measurement system that works for you.

Metric:
• Meters
• Centimeters
• Square meters
• Liters

Imperial:
• Feet and inches
• Square feet
• US gallons
• US quarts

SAVED PAINT PROJECTS

Save useful calculations and return to them later. Edit room dimensions, duplicate similar rooms and keep several rooms together in one project.

QUICK CALCULATORS

Use dedicated tools for:
• Room paint
• Single wall
• Ceiling
• Multiple rooms
• Individual walls

WORKS OFFLINE

Core paint, room, area, coverage, can and cost calculations work offline. No account is required.

USEFUL FOR DIY & HOME IMPROVEMENT

Paint Calculator: Room & Wall is useful for homeowners, renters, DIY projects, decorators, painters, contractors and anyone asking “how much paint do I need?”

Whether you are painting a bedroom, calculating an accent wall, estimating a ceiling or planning several rooms, get the measurements you need before buying paint.

IMPORTANT

Paint calculations are estimates. Actual paint requirements can vary based on surface condition, porosity, color change, application method, paint type and manufacturer specifications. Always check the coverage information on your paint product before purchasing.