Calculate how much bedding and joint sand you need for a paver project, including volume, weight, bag count, and total cost.
Paver Sand Formula
This calculator works in three modes. Bedding sand under the pavers is solved from area and depth, joint sand for the gaps is solved from area and a coverage rate, and the cost mode prices a known amount of sand.
Bedding sand volume:
V = A * D * (1 + allowancePercent / 100)
Converting that volume to weight:
W = (V / 27) * Density
Joint or polymeric sand by coverage:
Bags = ceiling(A * (1 + allowancePercent / 100) / C)
- V = volume of bedding sand in cubic feet
- A = paved area in square feet
- D = bedding sand depth in feet (a 1-inch layer is 0.0833 ft)
- W = weight of sand in pounds
- Density = supplier bulk density in pounds per cubic yard (2,700 is an illustrative assumption, not a universal mason-sand constant)
- Bags = number of bags of joint sand, rounded up
- C = coverage of one bag in square feet, set by paver type and joint width
Bedding mode uses your area and specified depth, plus the visible allowance, for volume and estimated mass. Joint mode uses coverage for the exact product bag and joint geometry, rounding up before per-bag pricing. Known-amount mode converts supplied volume or mass using the chosen density, then adds the visible allowance, which starts at 0%. Optional blank bag size or price omits that estimate; a per-bag price requires bag size. Bulk quotes price the required continuous amount, while bag quotes price rounded whole bags. Prices are USD and exclude tax, delivery and labor. One cubic yard is exactly 27 cubic feet; one US short ton is 2,000 lb.
Sand Density and Joint Coverage
Weight depends on bulk density, moisture and condition. The retained density table gives illustrative legacy assumptions, not product guarantees; use supplier density. The 2,900 lb/yd³ entry is approximately 107.4 lb/ft³ (shown rounded below). Joint coverage depends on the exact product, package, paver dimensions, and joint width and depth.
| Sand type | Density (lb/yd³) | Density (lb/ft³) |
|---|---|---|
| Mason / bedding sand | 2,700 | 100 |
| All-purpose paver sand | 2,700 | 100 |
| Concrete / sharp sand | 2,900 | 107 |
| Wet sand | 3,240 | 120 |
The table below retains illustrative coverage scenarios for nominal 50 lb bags. They are not guaranteed by these generic joint labels. The widget defaults to required product coverage; custom coverage refers to the exact bag whose coverage you enter. Manufacturer coverage can differ substantially.
| Paver type and joint | Approx. coverage per bag |
|---|---|
| Standard pavers, 1/8 in joint | ~80 sq ft |
| Standard pavers, 1/4 in joint | ~50 sq ft |
| Tumbled / wide joint | ~30 sq ft |
| Flagstone / irregular wide joint | ~20 sq ft |
Example Problems
Example 1: Bedding sand for a patio. You have a 12 ft by 10 ft patio and want a 1-inch bedding layer of mason sand. The area is 12 x 10 = 120 sq ft. With a specified 1-inch depth and 0% allowance, depth is exactly 1/12 ft, so volume is 120 x (1/12) = 10 cubic feet, or 10/27 cubic yards (about 0.37037). At the illustrative 2,700 lb/yd³ density, weight is exactly 1,000 lb under this model, or 0.5 US short ton. Actual bulk density may differ.
Example 2: Joint sand for the same patio. Assume the exact product and joint geometry specify 50 sq ft per bag, with 0% additional allowance. For 120 sq ft, demand is 120/50 = 2.4 bag equivalents, rounded up to 3 whole product bags. A 1/4-inch joint alone does not establish this coverage.
FAQ
How deep should the bedding sand layer be? Follow the paver system, base design and product instructions for your site and application. A nominal 1-inch bedding layer appears in some manufacturer systems; it is not universal design advice. This calculator requires your specified depth and does not assume one. Compaction, drainage and structural design require separate consideration.
What is the difference between bedding sand and joint sand? Bedding sand is the leveling layer the pavers rest on, and you size it by area and depth. Joint sand fills the narrow gaps between pavers after they are set, and you size it by area and a coverage rate. Polymeric joint sand hardens when wetted to lock the pavers in place and resist weeds, while bedding sand stays loose. The calculator handles each one in its own mode.
How much sand do I need per square foot? For a 1-inch bedding layer you need about 1/12 of a cubic foot of sand per square foot, so 100 sq ft needs roughly 8.3 cubic feet, or about 0.31 cubic yards. For joint sand, use the exact product coverage for the paver size/shape, joint width/depth and package. The retained 20–100 sq ft presets are illustrations for nominal 50 lb bags, not universal coverage limits or product specifications.
