Ohio Gravel Calculator: Stone Quantities for Wet Clay Ground
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Most of Ohio sits on glacial clay that holds spring rain close to the surface, and wet clay under a thin stone layer is how a drive grows potholes by March. So before you use the gravel calculator below, it pays to know what's under your feet, because the ground decides how deep the stone should go. The tool then handles the arithmetic: cubic yards, tons and cubic feet from your measurements.
What Your Ground Does to the Depth
Lake plain clay, Toledo to Lorain. The old lake bed is flat and sticky. Rain and snowmelt sit on it until ditches and tile carry them off, and that trapped water heaves anything set shallow. Because of that, a stone layer here needs to lift the surface above the wet and shed water off a crown. Plan on the deeper end of any depth range and don't skimp on the base course.
Till plains of western and central Ohio. Clay loam over gently rolling ground drains slowly, so water ponds in the flat swales between ridges. A pad or drive built in a low spot will sit in that water. The recommendation: build up from the swale or put the stone somewhere higher.
Northeast plateau and snowbelt. Water perches on a dense subsoil layer and stays there, and heavy snow holds back the working season. Base work waits until the ground drains in spring, so measure over winter and order when it's dry.
Southeast and southern hills. Here the trouble is slope, not flatness. Storm runoff moves fast and hillside clay slips after long rain, which means a drive cut into a hill needs a way to move water off it and across, not down it.
Across the state, frost reaches about 32 inches in much of Ohio and about 36 inches in parts of the north, and local building departments set the figure. No gravel layer reaches that deep. What you can control is drainage, and that's the job the base does.
Filling In the Boxes for Clay-Ground Jobs
- Shape: rectangle, circle, or multiple areas (up to 5, added together).
- Size: length and width in feet, or diameter in feet for a circle.
- Depth: in inches, from 0.25 to 24.
- Material: pick it from the list so the tons match the stone.
- Extra: an optional box adds 5% for compaction and spillage.
- Result: press calculate, then use Email my quote if you want the figures sent to you.
Where the Numbers Come From
The volume step is fixed: length x width x (depth in inches ÷ 12) gives cubic feet, and dividing by 27 gives cubic yards. The weight step depends on the stone, because denser stone packs more pounds into the same yard.
| Calculator material | Pounds per cubic yard | Tons per cubic yard |
|---|---|---|
| Driveway / walkway gravel | about 2,800 | 1.40 |
| Pea gravel | about 2,800 | 1.40 |
| Crushed stone (#57, 3/4") | about 2,800 | 1.40 |
| Crusher run / road base | about 3,000 | 1.50 |
| River rock | about 2,700 | 1.35 |
For Ohio orders, 304 limestone and 411 limestone both carry fines and pack tight, so both belong on the 1.50 line. #57 limestone is clean stone and uses 1.40.
Three Ohio Jobs, Run Through the Math
These are examples with made-up dimensions, not customer projects.
Side-yard dog run. A strip 8 ft wide and 36 ft long between the house and the fence, covered 3 inches deep with pea gravel. Area is 288 sq ft. Volume is 288 x 0.25 = 72 cu ft, and 72 ÷ 27 = 2.67 yd³. At 1.40 that comes to 3.7 tons. Pea gravel is rounded and easy on paws, and a clay side yard will hold water under it, so check that the strip slopes away from the foundation first.
Turnaround or parking pad. A 24 by 30 ft pad off a farm lane with 6 inches of 304 limestone and a 2 inch 411 limestone top.
- Base: 720 sq ft x 0.5 = 360 cu ft. 360 ÷ 27 = 13.33 yd³. x 1.5 = 20.0 tons.
- Top: 720 x (2 ÷ 12) = 120 cu ft. 120 ÷ 27 = 4.44 yd³. x 1.5 = 6.7 tons.
- With the 5% box ticked, those become 21.0 and 7.0 tons.
Run the two layers as two separate calculations. A single 8 inch entry would give the same total but no split.
French drain along a foundation. A trench 60 ft long, 18 inches wide and 18 inches deep, filled with #57 limestone. Enter 60 x 1.5 ft and 18 inches of depth: 90 sq ft x 1.5 = 135 cu ft, which is 5.0 yd³ and 7.0 tons at 1.40. The pipe takes up a little of that space, so the figure runs slightly high, which is the safe side. For bigger drainage work, the stone calculator covers clean stone sizes.
Why Running Short Hurts on Clay
Stone that gets packed settles, and some always stays in the pile. That's what the 5% box is for, and on anything driven on it belongs in the order. Loose cover such as a pea gravel run that nobody compacts can go without it.
On clay, running short costs more than running a little long. A half-finished base sits open to rain while you wait, and wet clay underneath is hard to compact once it's soaked. Round up to the next sensible figure. Frozen or saturated clay won't compact at all, so plan the work for spring through late fall.
Setting Up a 304 Limestone Delivery
Once the calculator gives you a tonnage, open the product page, set your quantity and pick a delivery date. Delivery is arranged at checkout by ZIP code, and the truck needs a clear path to a firm dump spot. Questions about your lane or pad can go to Ohio Rock Supply through the contact page.
Common questions
Is it smarter to bring in the whole lot at once or a layer at a time?
On clay, one delivery per layer often works well. The 304 base goes down and gets compacted while the ground is dry, and the 411 top follows once the base is set. If the dump spot is small, splitting the order also keeps the pile manageable.
How can I double-check the calculator with a pencil?
Multiply length by width in feet, multiply by depth in inches divided by 12, and divide by 27 for yards. Then multiply by 1.40 or 1.50 depending on the stone. Example: 12 x 20 ft at 4 inches is 80 cu ft, 2.96 yd³, and 4.1 tons at 1.40.
The number lands between two tonnages. Which way do I go?
Go up. A small leftover pile is useful for patching ruts after the spring thaw. Coming up short leaves part of the job waiting on a second trip.
Pea gravel or crushed gravel in the material list, which one is mine?
Both use 1.40 tons per yard, so the weight comes out the same. The choice is about use. Rounded pea gravel stays loose for walking and dog runs, and crushed stone locks together where tires roll.
How do I size a base and a top layer separately?
Run the same length and width twice, once with the base depth on the road base line and once with the top depth on the gravel line. Order each figure as its own product.
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