Roof Coating Calculator

Gallons & Cost for Elastomeric, Silicone & Acrylic

The Roof Coating Calculator returns the gallons of coating material needed for a two-coat application on your roof. Select coating type (elastomeric acrylic, silicone, or polyurethane) and enter your roof area; the tool returns gallons needed using typical coverage of 1 gallon per 80-100 sq ft for two coats. Coatings extend the life of an existing flat or low-slope roof by 10-20 years for a fraction of the cost of a tear-off. Pair with our Coating Guide for surface prep and application steps.