MetandumFREE TOOLS. NO SUBSCRIPTION.Find a calculator ⌕My projects
MEASURE ONCE. PLAN YOUR PURCHASE.

Exterior Paint calculator.

Combine rectangular facades and triangular gables, then calculate paint containers.

PAINTING

Your inputs

Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.

Where to get this value

Use the usable coverage or mixed yield printed on your product label for the stated application. Do not substitute bag weight for finished volume.

Where to get this value

Use the actual usable quantity or dimensions of the product you intend to buy. Check the label and the unit shown here.

Shortcuts only; choose your own allowance above.
Where to get this value

Enter your own allowance. Presets are input shortcuts, not a construction recommendation.

Facade 1
Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Where to get this value

Measure only the area, length or quantity to deduct, in the unit shown. Keep this consistent with the surface being calculated.

Quantity and planning estimate
YOUR ESTIMATE
∑

A clear estimate starts here.

Enter your dimensions and product details to see the quantity and purchase breakdown.

CONTINUE YOUR PLAN

Find the next material.

Keep the quantity, then use another tool for the remaining parts of your purchase.

Explore all calculators
Formula and assumptions
BEHIND THE NUMBERS

How this calculation works.

Gable height is measured above the rectangular wall. Each facade has its own openings. Product coverage must match the selected surface and application.

Area = Σ(width × height + width × gable height / 2 − openings)Calculated with normalised units

A worked example

Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.

Chosen product coverage
10 m²/L
Your number of coats
2
Container volume
5 L
Waste allowance
10 %
Facade 1
Facade width
6 m
Rectangular height
3 m
Triangular gable height
2 m
Excluded opening area
4 m²

Paint containers to purchase: 1 containers

Before you purchase

Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.

Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.

Check your purchase assumptions

Keep per-coat paint coverage separate from completed-system coverage

Keep the project moving.

Explore painting
PaintingPaint Calculator

Estimate paint containers from measured area, coats and the coverage on your product label. See required paint and purchased surplus.

PaintingRoom Surface Area Calculator

Measure walls and ceiling, subtract openings, and keep the surfaces separate.

Connected work guides and comparisons

Explore paint coverage and product orders

Browse all work types

Prepare your material measurements and product data

Exterior face paint

Find material sheets for this calculator

Compare supplied alternatives and quantity changes

Browse all quantity scenarios