Planning guide
What is topsoil?
Topsoil is the upper, biologically active soil layer used to establish lawns, improve grades, and fill planting areas. Purchased blends vary in sand, silt, clay, and organic content.
How this calculation works
Volume equals surface area multiplied by finished depth. Because soil settles, the displayed 10% allowance is especially useful for fill and grading work.
Common measurement mistakes
- Assuming every topsoil blend weighs the same
- Ignoring settlement after watering
- Adding a thick incompatible layer over poorly drained clay
Professional tips
- Choose screened soil for lawns and finish grading
- Loosen the existing surface before spreading
- Match the blend to drainage and planting needs
Topsoil Calculator FAQs
What topsoil depth should I use?
Lawn repairs often use 1–2 inches (2.5–5 cm); new beds commonly use 4–8 inches (10–20 cm) depending on the existing soil and intended plants.
How should I allow for topsoil settlement?
Use a material allowance when filling or grading, and confirm the finished elevation after the soil is lightly settled. Loose delivery volume can decrease after spreading and watering.
Should I buy topsoil by the bag or in bulk?
Bags suit small repairs and constrained access. Bulk delivery is often more practical for larger beds and grading work, but supplier blend, density, and delivery minimums vary.