$197 Value • Precision Paint Calculator

PaintPRO Room Estimator Engine

Most DIYers overbuy by 30%... or run out mid-wall and watch the whole weekend implode. This calculator cuts through the guesswork with a pro-style material estimate for paint, primer, budget, and cost-per-square-foot — built specifically for real-world DIY home renovation decisions.

Exact Gallon Count

Primer Budget Logic

Surface Porosity Adjustments

Door + Window Knockouts

Project Inputs

Room Dimensions

Room Length (ft)

Room Width (ft)

Ceiling Height (ft)

Paint Coats

Knockouts + Coverage

Number of Doors

Standard deduction: 21 sq ft each

Number of Windows

Standard deduction: 15 sq ft each

Paint Sheen

Surface Porosity

Ceiling Paint

Include the ceiling in the total paint estimate

Budget Inputs

Paint Price per Gallon ($)

Primer Price per Gallon ($)

Primer Strategy

Base Coverage per Gallon

Default: 350 sq ft per gallon

Use the Print / Download PDF button to save a clean estimate as a PDF from your browser.

Estimator Output

Net Paintable Area

0 sq ft

Wall area after door and window deductions.

Adjusted Coverage

0 sq ft/gal

Coverage tuned for sheen + surface porosity.

Paint Needed

0.0 gal

Includes selected coat count and optional ceiling.

Primer Needed

0.0 gal

Recommended based on wall thirst and strategy.

Paint Budget

$0.00

Material cost for finish paint only.

Primer Budget

$0.00

Material cost for primer layer.

Total Estimated Spend

$0.00

Paint + primer combined.

Cost Per Sq Ft

$0.00

Budget efficiency across total painted surface.

Dial in your numbers and hit Calculate Estimate. You’ll get a pro-style material readout designed to stop overbuying, underbuying, and budget surprises.

How it works: The engine calculates room perimeter × height, subtracts standard door/window knockouts, optionally adds ceiling area, then adjusts real-world coverage using sheen and surface porosity multipliers. Gallons are shown in exact form so you can choose whether to round up for extra safety.