Connecticut Gravel Calculator for Odd-Shaped Spaces
Enter your project dimensions
On an older Connecticut property, the drive rarely runs square. It bends around a stone wall, widens at the barn and pinches at the gate post, and that's before anyone has probed for ledge. A gravel calculator is only as good as the measurements you feed it, so this page starts with the tape measure.
Measuring first: curves, walls and awkward corners
What we'd check first is where the finished stone edge will actually sit. Along an old wall, that's usually a few inches off the face of the stones, not the wall line itself. Measure to the edge you intend to keep.
Curved drives and paths. Run the tape down the middle of the curve for the length. Take the width at three or four points and average them. Length x average width is close enough for ordering.
L-shapes and doglegs. Break the space into rectangles that don't overlap. The calculator's multiple-areas mode adds up to five of them.
Triangles. A wedge between a wall and the house is half a rectangle. Enter the base as the length and half the height as the width, and the area comes out right.
Round features. Use the circle shape and the full diameter. If there's a fire ring or tree in the middle, work out the inner circle by hand and take it off (example below).
More than five pieces. Run the tool twice and add the results.
Depth. Ledge sits close to the surface across much of the state, so the depth you planned may not be the depth you get. Push a steel bar down in several places before you settle on a figure.
Putting the measurements into the tool
Choose the shape: rectangle, circle or multiple areas. Enter the dimensions in feet and the depth in inches, anywhere from 0.25 to 24. Select the material, since each one weighs something different per yard. If the stone will be compacted, tick the option that adds 5% for compaction and spillage.
Press calculate and the result shows cubic yards, tons and cubic feet. Email my quote will send that estimate to you, which is handy if you want to compare it against your own arithmetic later.
Depths for ledge and 42-inch frost
Frost goes about 42 inches down here, and repeated freeze-thaw is the main reason a thin base fails. These are the depths to plan around:
| Project | Depth to enter | Notes |
|---|---|---|
| Walkway or garden path | 2-3 in | Over compacted ground or fabric |
| Refreshing a worn drive | about 2 in | Surface gravel only |
| New driveway, base layer | 3-4 in | Processed gravel, compacted |
| New driveway, top layer | 2-3 in | Driveway gravel, #57 or 3/4 inch trap rock |
| Patio or sitting area | 2-3 in | Inside solid edging |
| Drainage trench or soggy spot | 12 in or more | Size it on the stone calculator |
Processed gravel (often just "process" in the trade) is the New England base aggregate, usually sized as 3/4 inch process. That's how the material is described locally, not a certification.
What the result is telling you
The tool multiplies length by width by depth (inches ÷ 12) for cubic feet, then divides by 27 for cubic yards. Tons are cubic yards times the material's weight:
- Crusher run / road base: about 3,000 lb per yard, so 1.50 tons. Use this row for processed gravel.
- Driveway / walkway gravel, pea gravel (3/8") and crushed stone (#57, 3/4"): about 2,800 lb, so 1.40 tons.
- River rock (1-3"): about 2,700 lb, so 1.35 tons.
A creek bed, a fire ring and a barn pad
These are illustrations, not customer jobs.
Dry creek bed
A meandering channel runs 48 ft along its centerline and averages 4 ft wide. You want 6 inches of river rock.
- 48 x 4 = 192 sq ft
- 192 x 6 ÷ 12 = 96 cu ft
- 96 ÷ 27 = 3.56 cu yd
- 96 ÷ 27 x 1.35 = 4.8 tons
If the bed carries real runoff in a storm, the larger stones for the banks are a separate order of large river rock.
Fire pit surround
A 16 ft circle of pea stone, 3 inches deep, around a 5 ft fire pit.
- Outer circle: 3.1416 x 8 x 8 = 201.1 sq ft
- Fire pit: 3.1416 x 2.5 x 2.5 = 19.6 sq ft
- Stone area: 201.1 - 19.6 = 181.4 sq ft
- 181.4 x 3 ÷ 12 = 45.4 cu ft, ÷ 27 = 1.68 cu yd
- 1.68 x 1.40 = 2.35 tons
Entering just the 16 ft circle gives 1.86 cu yd and 2.61 tons, which slightly over-orders. For a small job, that margin may be welcome.
Pole barn or equipment pad
A 30 x 40 ft pad with 6 inches of processed gravel.
- 1,200 sq ft x 6 ÷ 12 = 600 cu ft
- 600 ÷ 27 = 22.22 cu yd
- 22.22 x 1.50 = 33.3 tons
- With the 5% option: 23.33 cu yd, 35.0 tons
On a pad that size, confirm the grade with a string line before ordering. A slope you didn't notice can add inches at the low end.
From sketch to delivery on an older lot
Check the tonnage against your own sketch, then open the product page for that material. Choose the quantity and delivery date there; delivery is arranged at checkout by ZIP code, and the truck needs clear access to a firm dump spot, which on older lots can mean checking the gap between gate posts. You can open the Connecticut locations page, or reach Connecticut Rock Supply through the contact page if you'd like someone to look over your numbers.
Common questions
How much stone does it take to fill potholes in a gravel drive?
Measure each hole's length, width and average depth, and enter them as separate areas (up to five at a time). Most potholes are small enough that a total of well under a yard covers several; the tool will tell you exactly.
My space curves and won't fit a rectangle. How do I measure it?
Measure the length along the centerline, average several widths, and enter those. If one part is clearly a different shape, split it off as its own area.
The result is in yards, but my tractor bucket is rated differently. How do I convert?
Check the bucket's rated capacity in cubic yards (it's on the plate or in the manual) and divide the calculator's cubic yards by it. For a pickup bed, multiply length x width x height in feet and divide by 27, then check the truck's payload against the ton figure.
Should I enter the depth before or after the stone is packed down?
Enter the finished depth you want, then tick the 5% compaction option. Processed gravel packs tighter than loose stone, so some people add a little more on new driveways.
How do I work out a base layer and a top layer in one order?
Run the calculator once per layer: processed gravel at base depth, then driveway gravel at top depth. Each layer gets its own product and its own tonnage.
Related calculators
That tonnage ships free.
Driveway gravel, #57, crusher run: priced by the ton, delivered across Connecticut.
