Project workflow
Choose the quantity rule that matches the material
Start with the actual treatment area
Exclude beds, hardscape and structures from lawn measurements. For raised beds, measure the inside footprint that will actually be filled.
Use label or supplier rates
Seed rate, sod coverage, soil bag volume and compost application depth should come from the product or project recommendation whenever possible.
Keep quantity and recommendation separate
The calculators estimate how much material a chosen rate or depth requires; they do not prescribe horticultural application rates.