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Soil Calculator

Use this soil calculator to estimate how many bags of soil, compost, or topsoil to buy using square feet and inches or square meters and centimeters.

Live calculator

Soil

Soil volume35 cu ft

35 cu ft / 1.3 yd³ / 0.99 m³ with extra.

Bags needed24

Rounded up using 1.5 cu ft bags.

Estimated bag cost$192.00

Bags rounded up multiplied by price per bag.

Material estimates need field measurements and a waste allowance. Supplier coverage, cuts, breakage, compaction, and local installation requirements can change the order quantity.

Formula

Soil formula

Volume = area x depth x (1 + waste percent); bags = volume / bag size

Use square feet with inches and cubic-foot bags, or square meters with centimeters and liter bags.

How to use

Steps

  1. Choose feet or meters for the project area.
  2. Enter bed or garden area in square feet or square meters.
  3. Enter desired soil depth in inches or centimeters.
  4. Add a small extra percent for settling and uneven areas.
  5. Enter bag size in cubic feet or liters and price per bag to estimate quantity and cost.

Example

Sample calculation

Area100 sq ft / 9.29 sq m
Depth4 in / 10.16 cm
With 5% extra35 cu ft / 0.99 m³
1.5 cu ft / 42.48 L bags24 bags

Calculator use

Best for

  • Estimating soil, compost, topsoil, or potting mix volume for beds, raised beds, lawn top-dressing, and garden projects.
  • Converting area and depth into cubic feet, cubic yards, and whole bags.
  • Checking bag count and cost before buying soil or comparing bulk delivery.
  • Adding a settling buffer for loose soil, compost, amendments, and uneven beds.

Before relying on it

Check first

  • Using bag count without checking the cubic feet printed on the bag.
  • Ignoring settling, compaction, existing soil level, drainage, amendments, and bed shape.
  • Treating volume as soil-quality, fertility, drainage, or planting advice.
  • Overfilling raised beds or planters without leaving room for watering, mulch, and settling.

Details

What to know before using the result

DepthInches or centimeters

A 4-inch layer is one-third of a foot deep; the metric mode applies the equivalent centimeter depth.

Bag roundingWhole bags

The calculator rounds up because bagged soil is sold in full bags, whether the package is listed in cubic feet or liters.

SettlingMay need more

Loose soil and compost can settle after watering, mixing, and planting.

Source notes

References used for this calculator

NISTProvides common U.S. customary unit conversion references for length, area, and volume.EPA WaterSenseOutdoor WaterSense guidance discusses landscape planning and outdoor water use.

Benchmarks

How to read the result

1 - 2 in: Top-dressing.

A light layer for refreshing existing soil or lawns.

4 - 6 in: Garden bed layer.

Often used for amending or filling shallower beds.

Raised bed: Deeper fill.

Use the actual bed depth and consider settling after watering.

Calculator accuracy

Methodology and assumptions

Formula, inputs, limitations and review record
Formula

Volume = area x depth x (1 + waste percent); bags = volume / bag size

Inputs used

Square feet or square meters, Depth, Waste percent, Bag size, Price per bag

Limitations

Home-material calculators estimate quantity and cost from visible dimensions and coverage assumptions. They do not replace field measurement, installer guidance, structural design, permits, or code review.

Review record

Catalog QA baseline on June 6, 2026. This date marks the catalog-wide automated and editorial QA baseline, not a tool-specific expert review.

Cite this page

Toolkit Shelf. Soil Calculator. https://toolkitshelf.com/tools/soil-calculator

FAQ

Common questions

How do I calculate soil for a garden bed?

Multiply the bed area by soil depth to get volume, then divide by the bag size. In feet mode, inches are converted to feet; in metric mode, centimeters are converted to meters.

How many bags of soil do I need?

Divide total volume by the volume in each bag and round up to a whole bag. The calculator supports cubic-foot bags and liter bags.

Should I add extra soil?

A small buffer can help with settling, uneven beds, and mixing compost or amendments.

Why should I add a material buffer?

Cuts, waste, damaged pieces, uneven surfaces, pattern matching, delivery limits, and field measurements can all make the exact calculated amount too low.

Can this replace a contractor quote?

No. Use it for planning quantities and budgets. Labor, permits, code, site conditions, disposal, access, and contractor scope can change the real project cost.