Topsoil Calculator
Calculate cubic yards of topsoil or garden fill for lawn grading, raised beds, and new landscaping.
Assumptions
- Soil is spread at uniform depth after rough grading.
- 4–6 in is common for lawn establishment; raised beds may need 12+ in.
- Settling reduces volume 10–20% after watering — depth is finished grade target.
- Does not include compost amendment ratios.
- Bulk topsoil density varies with moisture content.
Volume = area × depth, converted to cubic yards with optional waste allowance.500 ft² lawn area, 4 in topsoil
- Depth = 4 in = 0.333 ft. Volume = 500 × 0.333 = 167 ft³ = 6.2 yd³. With 10% waste ≈ 6.8 yd³.
How to measure
Stake the area to be covered and measure length × width. For grading, estimate average depth between high and low points across the zone.
Common mistakes
- Ordering fill dirt when nutrient-rich topsoil was needed for planting.
- Using maximum depth at low spots only — use average depth.
- Ignoring that truck measurements are loose volume before spreading.
Frequently asked questions
Topsoil vs fill dirt?
Topsoil has organic matter for planting. Fill dirt is for grading and compaction under structures.
How much for sod prep?
Often 2–4 in of topsoil tilled into the existing grade before sod or seed.
Raised bed calculation?
Treat the bed footprint × side height as a rectangular volume.
Will soil compact?
Yes. Order slightly high or plan to top-dress after initial settling.