Paver Sand Calculator: The Inch That Sets the Patio
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Most people arrive here mid-patio, with the stone rolled and the pavers on a pallet, needing the layer in between. That layer is exactly 1 inch of coarse sand, and it is the last thing under the patio that can still be got wrong. The paver sand calculator sizes it in tons off the same footprint the base was built to, and it keeps that number well away from the bags of joint material, which is a different purchase entirely.
The weeks of the Maryland year when a bed can actually be screeded
Paver work runs spring through late fall here. Frozen or saturated ground stops the base compacting, and that stoppage lasts longest on the Garrett plateau and shortest on the Eastern Shore, where wet ground rather than frost is the usual reason to wait.
The bedding course adds a second constraint the base does not have. Sand screeds properly when it is damp to dry and slumps when it is soaked, so a pile that has taken a night of thunderstorm rain costs you a day. Keep it tarped from the moment it lands.
Joint material narrows the window again. Polymeric has to go down bone dry and be watered in deliberately, which is asking a lot of a humid August afternoon with a storm building. Late spring and September tend to offer the steadier runs of dry hours. Plain mason sand in the joints is far less fussy about the forecast, at the cost of topping it up every year or two.
Measuring the bedding area, which is not the paved area
The bed sits on the base, so it covers what the base covers: the paving plus the 6-inch band running past every exposed edge. Measure that outline, not the pavers.
Curves and odd outlines break into pieces rather than being rounded off. A rectangle to the narrowest point plus a circle for the bulge, halved by hand, gets a bay-fronted patio close. An L goes in as two rectangles under the multiple-areas option, which takes up to five at once. Steps and landings are their own small areas.
Joints are measured differently, and this is where the two numbers part company. The joint count works off the paved surface only, because the band past the edge has no joints in it.
Why the depth box only ever reads 1 on this page
Shape first, then the dimensions in feet, then depth in inches. The form accepts anything from 0.25 to 24, and for a bedding course the answer is 1. Not 2, not 3. A deeper sand bed shifts under load and leaves pavers rocking, and depth that the job needs belongs in the stone underneath it, sized on the paver base calculator.
Choose the material next, since that selection sets the weight the tool converts with, and the outputs come back as cubic yards, tons and cubic feet together. The result can be emailed over as a written quote.
Which of the three sand tools you want depends on the job rather than the product:
- This page, for a 1-inch setting bed under pavers, converted at roughly 1.35 tons per cubic yard.
- The sand calculator for Mason Sand or Washed Sand at any other depth, which is what a sandbox, a pipe bedding or a leveling course under bed frames needs.
- The paver base tool for the compacted stone below, which is a heavier material and a much larger order.
Coarse and angular is what the bed wants, mason grade or concrete grade. Rounded play sand rolls under load and washes out of joints. Stone dust sets up firmer than sand and some installers prefer it, though it leaves less room to correct a level once it is screeded.
Why one patio needs a ton of sand and eight bags of sand
A 300 square foot patio takes something over a ton of bedding sand and somewhere between four and eight bags of joint material. They share a name and nothing else, and running the joints through a tonnage calculation is the error this page exists to prevent.
| Joint width on the paving | 50 lb bags per 100 sq ft | What it is for |
|---|---|---|
| Standard, 1/8 to 1/4 inch | roughly 1.3 to 2.5 | Most Maryland patio and walk formats |
| Wide, 3/8 inch and over | roughly 2.7 to 5 | Tumbled and rustic pavers with open joints |
That works out at one 50 lb bag for every 40 to 75 square feet of standard joints, and coverage falls away quickly with thicker pavers, so follow the figure printed on whatever bag you buy and add one. The bagged joint product is a garden center purchase; the bulk listings on this site cover the bedding course.
A 36-foot front walk and a 26 by 16 courtyard
Both are invented for this page.
The front walk. Paving 4 feet wide and 36 feet long is 144 square feet. Add the 6-inch band on both sides and both ends and the bedding area is 5 by 37 feet, or 185 square feet. At 1 inch, that is 185 divided by 12, which is 15.4 cubic feet, or 0.57 cubic yards. At roughly 1.35 tons per cubic yard, about 0.77 tons. Joints across 144 square feet of paving come to 2 to 4 bags.
The courtyard. Paving 26 by 16 feet is 416 square feet with all four sides open, so the bedding area is 27 by 17, or 459 square feet. One inch of that is 38.25 cubic feet, which is 1.42 cubic yards, or about 1.91 tons. Joints for 416 square feet run 6 to 11 bags.
Screed the bed on rails or lengths of pipe, fill the tracks as the pavers go down, and leave the sand loose. It gets its compaction from the plate compactor run over the finished pavers, not before.
The half ton kept back for the joints that drop
Round the bedding order up to the next half ton. The walk above is a 1 ton order and the courtyard a 2 ton order, and the surplus has somewhere to go: the first wash-in drops joint sand by about a quarter inch, and every joint on the patio wants topping up afterwards.
Plain sand in the joints is a yearly or every-other-year job here. Rain crossing the surface after a summer storm takes some, ants take some, and a leaf blower on full in November takes a surprising amount, so keep the nozzle low around filled joints. Polymeric holds for years before the outer joints start opening. If joint sand keeps washing out in the same place, the answer is usually a downspout or a fall pointing at the patio rather than the sand itself.
Set the tonnage and a delivery date on the product listing. Delivery is arranged at checkout by ZIP code, and the delivery page covers what the truck needs where it tips.
Common questions
How do I split one order between the stone and the sand?
Run them as two calculations and put them on the order as two lines. The base is the large number, several tons of compacting stone at a depth set by the subgrade, and the bed is the small one at a fixed inch. They arrive as separate materials because they do separate jobs, and keeping the piles apart on the day matters, since the base has to be rolled and graded before any sand is screeded over it.
The patio has a curved front. What do I put in the form?
Break it up rather than averaging it. Enter the rectangular part to the narrowest point, then enter the bulge as a circle and halve that figure by hand before adding it. For anything with several curves, lay the outline out with a hose or a string line first and take the width at several stations along it. Sand is cheap to be slightly over on and awkward to be short of mid-screed.
The old patio is coming up but the base is sound. How much do I need?
Only the bedding. Lift the pavers, sweep out every bit of the old bedding sand, and check the base is level, firm and draining before you commit to keeping it. If it passes, you need a fresh 1 inch over the same area, which is a fraction of what a full rebuild would take. Low spots, soft patches or standing water mean the base comes out too.
What happens if I run out halfway across?
The screeded level moves, which is the one thing you cannot hide. Sand from a second delivery can differ slightly in grade and moisture, and the join usually shows as a line of pavers sitting a touch proud or low. Keeping one bedding material across the whole area is the rule, so order the round-up rather than the exact figure.
How accurate is the tonnage the form gives back?
The arithmetic is exact and the site is not. On a fixed 1-inch bed the depth cannot drift, so almost all the error comes from the area, and the usual cause is measuring the paving instead of the base outline with its 6-inch band. Get that right and the figure will be close. Allow for a little loss in the wheelbarrow and on the tarp, which the 5 percent option on the form is there to cover.
Related calculators
One ton of bedding beats 25 bags.
Mason and washed sand delivered free; keep the bags for the polymeric sweep.