How To Measure a Room To Determine How Much Paint To Buy

Most interior paints provide 350 to 400 square feet of coverage per gallon. To calculate exact paint needs, use the chart below. Or visit www.gliddenpaint.com for an online, instant paint calculator.

Step 1: To find the total square footage, measure the entire room.

_______ wall width x _______ wall height (floor to ceiling) x _______ number of walls

= _______ total square footage

Step 2: If the doors and windows will be a separate color,
calculate this area and subtract from the total square footage.

______ # of doors x 21 square feet (standard door size)

= _______ total square feet

_______ # of windows x 15 square feet (standard window size)

= _____ total square feet

Step 3: Total square footage divided by
square feet of coverage per gallon = Number of gallons per coat