Project workflow
Measure the finish field first, then apply product coverage
Separate surfaces by product
Countertops, backsplash, shower walls/floor and grout can use different coverage rules, so keep their geometry separate.
Record openings and transitions
Large openings can reduce net area while corners, niches and edge details still drive cuts.
Use exact package or fabricator coverage
Slab usability, tile box coverage and grout yield are product-specific inputs rather than universal constants.