How to use
- Measure the inside length and width of the space to be filled.
- Enter sand depth in inches, or centimeters after choosing metric.
- Adjust the density and extra percentage, then compare bulk volume with the equivalent bag count.
How the estimate is calculated
Finished cubic feet = length × width × depth in inches ÷ 12. Divide by 27 for cubic yards, then multiply by (1 + extra ÷ 100) for the order volume. Estimated short tons = order cubic yards × density. Bag equivalents divide order cubic feet by 0.5 and round up.
Example: a 5 × 5 ft sandbox filled 12 in deep holds 25 cu ft. With 0% extra, that is 0.93 cubic yards to order. At 1.35 short tons per cubic yard, it weighs 1.25 tons and equals 50 bags at 0.5 cu ft each.
Density and bag equivalents
| Planning figure | Value | Basis |
|---|---|---|
| Bag yield | 0.5 cu ft | Retail listing reviewed only as a search summary |
| Illustrative bag weight | 50 lb | Same listing; verify your product |
| Derived density | 100 lb/cu ft = 1.35 short tons/cu yd | 50 ÷ 0.5, then × 27 ÷ 2,000 |
| Default order extra | 5% | Editable spreading allowance |
The bag count is a volume equivalent, even if you change density. It does not promise that every bag weighs exactly 50 lb or that wet sand has the default density.
Choose the sand for the job
Play sand, all-purpose sand, concrete sand, and bedding sand are product categories, not interchangeable promises of suitability. Read the intended-use label for a sandbox. For paving, follow the paving system's bedding specification; the paver calculator combines the paving surface, base, and sand in one takeoff. Sand quantities do not describe pea gravel or crushed-stone quantities.
Use the depth you intend to maintain inside a sandbox border. Leave room for the border and any cover rather than assuming the full frame height should be filled. This calculator does not choose a play-space depth for you.
Common mistakes
- Putting a depth measured in feet into the inches field.
- Assuming a nominal bag weight is the same as a bag's volume yield.
- Using dry planning density for a wet delivery without checking with the yard.
- Estimating a paver base as sand when the system calls for a separate stone base.
Sources
A search summary describes a Tractor Supply Quikrete sand listing with 50 lb weight and 0.5 cu ft yield as search-summary information only. The product naming in the reviewed summaries is mixed between all-purpose and play sand, so this page uses the yield as a planning figure and makes no official product claim. Conversions follow NIST's exact length relationship.
Related calculators
- Paver Calculator — paving plus base and bedding material
- Gravel Calculator — stone aggregate with different material presets
- Pea Gravel Calculator — pea gravel surfacing with its own depth assumptions
Frequently asked questions
Is this sand weight exact?
It is an estimate from volume and your entered density. Moisture and product grading change weight, so ask the supplier for its figure.
Does changing density change the bag count?
No. The bag equivalent is based on 0.5 cubic foot of volume. Density changes estimated bulk weight only.
Can I enter a zero extra percentage?
Yes. Zero returns the geometric fill volume without an additional spreading allowance.
Does the calculator select sandbox depth?
No. Enter the depth for your own design and product. The worked example illustrates arithmetic rather than a recommended depth.
Can I use this for paver bedding?
It can measure a rectangular sand layer. Use the paver calculator when you also need paving pieces and the separate gravel base.