Project category / 01
Painting calculators
with no guesswork.
Measure walls, plan coats, price the job, and understand every number before you reach the paint counter.
All-purpose estimator
Paint Calculator
Start with wall area or room measurements. Account for doors, windows, coats, and the exact coverage on your paint.
Calculate paint →Purchase about 5 gallons
Calculators
Run the numbers.
Each tool keeps measurements, allowances, package rounding, and costs visible.
Paint Calculator
Estimate gallons or liters of paint from wall area, openings, coats and an editable coverage rate.
Open calculator →02Interior Paint Calculator
Estimate interior wall paint using room length, width, height, openings and coats.
Open calculator →03Exterior Paint Calculator
Estimate exterior paint from house dimensions, stories, gables, openings, coats and coverage.
Open calculator →04Ceiling Paint Calculator
Calculate ceiling area and paint quantity from room dimensions, coats and coverage.
Open calculator →05Primer Calculator
Estimate primer required from surface area, coats, openings and an editable coverage rate.
Open calculator →06Cost to Paint a Room
Estimate room painting materials and optional labor using your own local unit prices.
Open calculator →07House Interior Paint Cost
Plan a whole-interior paint budget using paintable area and editable material and labor prices.
Open calculator →Field notes
Measure smarter.
Plan the details.
How Much Paint Do I Need?
Divide the total coated surface area by the coverage printed on the paint label. For example, 1,400 coated sq ft at 350 sq ft per gallon equals 4 gallons.
Read guide →Guide 02Paint Coverage Chart
At an example rate of 350 sq ft per gallon, one gallon covers about 350 sq ft for one coat or 175 sq ft for two coats.
Read guide →Guide 03One Coat vs. Two Coats
Two coats require roughly twice the theoretical paint of one coat over the same area, but the right coat count depends on the product, surface, color change, and desired finish.
Read guide →