Formula
How this estimate works
wall square feet = wall length x wall height x quantity
Four 12 ft by 8 ft walls total 384 square feet before openings.
Calculate wall area
A wall is usually a rectangle: multiply wall length by wall height. Use quantity for repeated walls with the same dimensions.
Openings and deductions
For paint and drywall estimates, you may need to subtract large doors or windows depending on the level of precision required.
Assumptions used
- Each shape can be multiplied by quantity.
- Square yards are calculated by dividing square feet by 9.
- Square meters are converted from square feet for planning.
Before you order materials
- Subtract large windows or doors when precision matters.
- Measure wall height to the finished ceiling.
- Handle gables or vaulted walls as separate shapes.
Frequently asked questions
How do I calculate wall square footage?
Multiply wall length by wall height. For repeated walls with the same dimensions, multiply the result by the number of matching walls.
Should I subtract windows and doors?
For rough estimates you may not need to, but larger openings should be deducted for more precise material planning.
Can I use this for drywall?
Yes as a starting area estimate, then account for sheet size, layout, seams, and waste.