PaintSize Paint Calculator

PaintSize is a quick paint estimate calculator for rooms, walls, and small renovation jobs — get the numbers before you buy the paint.

Enter wall dimensions, doors, windows, paint coverage, can size, and unit price to estimate paintable area, required paint, can count, and material cost.

WHO IT'S FOR • DIY painters repainting a room or a wall • Anyone who wants a rough material budget before a paint job • Painters who need a quick on-site estimate

FEATURES • Paintable area calculation — calculate wall area from width, height, and wall count • Door and window subtraction — subtract openings from the total area • Required paint amount — estimate liters of paint needed • Can count and cost — calculate cans and approximate material cost • Estimate history — save estimates and review them later • Adjustable defaults — set coverage, can size, unit price, coats, and waste rate • Japanese / English — switch languages in settings

PRO UPGRADE A one-time upgrade removes banner ads. No subscription.

GOOD TO KNOW • No account or login needed • All data is stored locally on your iPhone

Open PaintSize and see how much paint — and budget — your next project needs.