Paint Calculator App — How Much Paint Do I Need?

June 6, 2026 • 4 min read • By Steve
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Every painter has been here: you're halfway through a job and you run out of paint. Now you're driving back to the store, hoping they can match the batch, and losing an hour you can't bill for. Or worse — you bought three extra gallons "just in case" and now they're sitting in your garage forever.

Paint Pro solves this by calculating exactly how much paint and primer you need for every room, every surface, every coat.

What Paint Pro Calculates

The Smart Mix Buying Guide

This is the feature painters love most. After calculating your total coverage, Paint Pro tells you exactly what cans to buy — how many gallons and how many quarts — to minimize waste and cost. No more guessing, no more over-buying.

Room-by-Room Breakdown

Add as many rooms as you need. Each room gets its own dimensions, ceiling type, accent walls, and trim count. The app generates a per-room breakdown and a combined purchase summary so you know exactly what to order for the whole job.

Free and Pro Versions

Paint Pro is free — unlimited rooms, full calculator, buying guide. Paint Pro Plus adds professional quoting, e-signature, invoicing, profit tracking, and supplier integration for $99/year.

Try Paint Pro — It's Free

Walls, ceilings, trim, accent walls, primer, and a smart buying guide. Unlimited rooms.

Launch Paint Pro
Steve is a concrete contractor and the founder of ProBuilder Apps. He builds foundations during the day and software at night. He's based in Canada and probably covered in concrete dust right now.
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