Painting Calculators — Construction
Buy the right amount of paint the first time. The interior and exterior paint calculators convert wall and surface area into gallons at your chosen coverage, the primer and stain tools size prep and finish coats, and the epoxy and garage floor calculators handle specialty flooring products. Each accounts for coats and coverage rate, turning room measurements into a precise shopping list and cutting leftover cans.
All Painting Calculators
Calculate epoxy coating quantity for garage floors and workshops by square footage.
Calculate gallons of exterior paint needed based on wall area, windows, doors, and coats.
Calculate garage floor paint quantity from garage dimensions and number of coats.
Calculate total gallons of interior paint needed for all rooms from wall dimensions and doors.
Calculate gallons of primer needed before painting based on surface type and condition.
Calculate gallons of stain needed for decks, fences, and siding by surface area and porosity.
Free Paint Calculator. Free online tool with accurate results using verified formulas. Includes worked examples, FAQ, and instant calculations.
About Painting Calculators
Buy the right amount of paint the first time. The interior and exterior paint calculators convert wall and surface area into gallons at your chosen coverage, the primer and stain tools size prep and finish coats, and the epoxy and garage floor calculators handle specialty flooring products. Each accounts for coats and coverage rate, turning room measurements into a precise shopping list and cutting leftover cans.
Whether you need to solve a one-time problem or verify your own calculations, these free tools cover the most common painting scenarios. All results are computed in your browser — no data is sent to any server.
What You Can Calculate
This section includes 7tools: Epoxy Floor Calculator, Exterior Paint Calculator, Garage Floor Paint Calculator, Interior Paint Calculator, Primer Calculator, Stain Calculator, Paint Calculator. Each calculator is free to use with no signup required.