How to Measure Tile for a Fireplace
Calculate Square Footage
Create a thumbnail drawing (or if you have an architectural rendering, that will also work). Grid paper can be helpful, but not necessary.
Measure the length and width of each area in inches.
Multiply length x width to determine the total area.
Divide total area by 144 (the total number of inches per square foot) to derive how many square feet you need for each section.
Add 10-15% additional tile to your batch for replacements, cuts, and installation errors.
Determine how many tiles are in a square foot.