Calculate the space you will actually fill
A cubic yard is a volume, not a weight or a guaranteed bag count. Use this calculator when you know the cavity or layer dimensions but have not chosen a sales unit. It suits a soil fill, a loose layer or several measured spaces; it does not choose the material or its finished depth.
Updated October 6, 2026 · Original YardTotals calculation exercise · Methods & corrections
Measure inside a container, not outside it
Consider two raised beds with inside dimensions of 6 × 3 ft and 4 × 4 ft. Both have a target fill level 10 inches above their internal floor, but the first already contains 4 inches of material and the second contains 1 inch. The remaining depths are 6 and 9 inches. Outside wall dimensions would include space that soil cannot occupy.
Keep each remaining depth with its area
The first bed needs 18 × 6 ÷ 12 = 9 ft³. The second needs 16 × 9 ÷ 12 = 12 ft³. Add the two volumes: 21 ft³, or 0.778 yd³. With a chosen 5% allowance, the planning amount becomes 22.05 ft³ or 0.817 yd³. These example fill levels explain the geometry; they are not crop-specific planting recommendations.
Translate the result to an actual order
If the selected material comes in 1.5-ft³ bags, 22.05 ÷ 1.5 = 14.7, so 15 bags supply 22.5 ft³. If it is sold in half-yard increments, the same requirement rounds to 1 yd³, leaving about 0.183 yd³ above the allowance-inclusive estimate. A bagged and a loose product may differ in composition; quantity alone does not establish suitability.
Use Known area for a shape you have already measured
An L shape can be split into non-overlapping rectangles. A triangular area is base × perpendicular height ÷ 2. Enter its area and additional depth using Known area. For a circle, enter diameter, not radius. When depths vary, enter separate areas rather than replacing the variation with the deepest measurement everywhere.
Read the metric result as the same physical volume
One cubic yard equals 0.764554857984 m³. The example’s measured 21 ft³ is about 0.595 m³, or 0.624 m³ with 5% extra. Changing the calculator’s measurement units converts the dimensions; it should not create a different project. Keep units beside every measurement to avoid confusing centimeters with meters or inches with feet.
Separate soil quality and settlement from cavity size
A volume result cannot tell you whether purchased topsoil is suitable for a bed. Utah State University Extension identifies texture, salts, pH, organic matter and coarse fragments as relevant quality factors. Ask about the product and any settlement before ordering. Do not apply the gravel calculator’s illustrative density to soil or treat a percentage allowance as a soil-blend recipe.
| Bed | Remaining depth | Measured volume |
|---|---|---|
| 6 × 3 ft inside | 10 in target − 4 in existing = 6 in | 9 ft³ |
| 4 × 4 ft inside | 10 in target − 1 in existing = 9 in | 12 ft³ |
| Combined | Before allowance | 21 ft³ / 0.778 yd³ |
| With chosen 5% | One allowance on total | 22.05 ft³ / 0.817 yd³ |
For rectangular layers, area is length × width. The divisor is 12 inches per foot × 27 cubic feet per cubic yard. Soil quality guidance is linked separately from our arithmetic. Read the source ↗
Before placing the order
- Are dimensions inside the space to be filled?
- Have you subtracted existing fill and excluded overlapping areas?
- Is the allowance separate from supplier rounding?
- Have you confirmed material suitability and settlement independently?