What it calculates
Estimate exterior wall paint with openings, coats and waste.
Exterior Paint Calculator
Estimate exterior wall paint after openings, coats and waste.
Planning and estimating aid only. Verify project requirements, manufacturer instructions, adopted codes, permits, and field conditions before performing regulated work.
Painting estimating
How to Use This Calculator
Use the field units shown below, then compare your result with the worked example. Measure gables separately and add their area deliberately.
How the calculation works
Perimeter × average wall height gives gross wall area. Openings are removed, then coats, coverage and waste are applied.
What the result means
Siding texture, spraying losses and color changes can materially affect actual gallons.
Calculate net wall area before applying coats
A 100-foot perimeter at 10-foot height gives 1,000 square feet. Subtracting 100 square feet of openings leaves 900. Two coats at 350 square feet per gallon, with 10% allowance, require about 5.66 gallons; whole-gallon planning rounds to 6.
Contractor tip: Measure gables separately and add their area deliberately. Do not multiply the area by the coat count before entering it and then apply the coats field again.
Verify the final quantity
The rectangular wall model does not add gables, dormers, soffits, trim or complex elevations. Product coverage and surface condition affect actual use. Check what your opening deduction already excludes.
Good practice: Compare the calculated quantity with plans, specifications, product packaging and current field conditions before purchasing material.