Road Base Calculator: Base Rock for Missouri Lanes and Pads
Enter your project dimensions
A farm lane is what brings most people to the road base calculator, and a lane is also where the order most often comes out wrong. The tape reads ten feet across; the ruts and the mowed edge have quietly made it twelve. The run looks level; the stretch near the low-water crossing has been pumping mud for two winters. None of that arrives in the arithmetic on its own, so it is worth settling what you are measuring before anything gets typed in.
Ruts, Shoulders and the Width That Grew While You Measured
Three slips account for most short orders on a rural drive.
The width crept. Take a 340-foot lane you remember as nine feet wide that has spread to ten. That extra foot is 340 square feet, and at six inches that is 170 cubic feet, 6.3 cubic yards, about 9.4 tons. A short order by itself.
The ruts were not counted. Filling three inches of rutting across the same 340 by 10 feet before the new layer goes down is 850 cubic feet, 31.5 cubic yards and roughly 47.2 tons. That is a separate calculation, not a rounding allowance.
Compacted depth was read as loose depth. Six inches finished is not six inches tipped. Base rock tightens under a roller and under traffic, which is the point of it.
Orders run long in one main way: measuring the whole mowed corridor rather than the running surface, then keeping the extra percentage ticked on top of a number that was already generous.
Putting a Bending Lane and a Bin Pad Into the Tool
The form takes a rectangle, a circle, or up to five separate areas added into one total. Length, width and diameter go in as feet, depth in inches anywhere from 0.25 to 24. Pick the material, leave the ten percent for compaction and spillage ticked or untick it, and press calculate for cubic yards, tons and cubic feet. There is an email field if you would rather have the figures sent over.
For a lane that bends around a bluff or a rock outcrop, run the tape down the center line for length and average three or four widths rather than using the widest point. For a turnaround, use the circle shape and enter the full distance across. An approach that widens at the road belongs in multiple areas as its own rectangle. A pad is simply its length by its width.
Three Thousand Pounds to the Yard, Measured After the Roller
Cubic yards come from length in feet times width in feet times the depth in inches divided by 12, with the whole thing divided by 27. Tons are those yards multiplied by the weight of the material you picked from the list.
| Material list option | Approximate pounds per yard | Tons per yard |
|---|---|---|
| Crusher run / road base | 3,000 | 1.50 |
| Stone screenings | 2,900 | 1.45 |
| Driveway / walkway gravel | 2,800 | 1.40 |
| Crushed stone, #57 or 3/4 inch | 2,800 | 1.40 |
Base rock sits on the 1.50 line because it carries fines. Tons are the number you order against. Cubic yards tell you how much room the pile wants, which matters when the only firm drop point is the turnaround.
When the Ticket Says Type 5 and the Cart Says Base Rock
Base rock is the Missouri term for the dense-graded mix of crushed stone and fines that goes under a drive. Locally it gets specified by MoDOT as Type 1 or Type 5 aggregate for base, both one-inch mixes with Type 5 also capping the finest dust, while Type 7 is the coarser inch-and-a-half grade. Those are the words on a local ticket rather than anything this storefront holds a certificate for. Order it as Base Rock.
Crusher run does the same job at the same 1.50 tons to the yard, but runs finer, which is what you want when a layer has to be screeded to a close grade. Lanes, drives, yards and pads take base rock, where the coarser top stone carries the load. Under pavers, where the finish matters more than the load, go to the crusher run calculator or the paver base calculator. Clean rock is the third term and swaps for neither: it means washed stone with no fines at all, it is there to drain, and the stone calculator sizes it.
A 340-Foot Lane, a Creek Crossing and a Bin Pad
Hypothetical sizes, not customer jobs.
The lane. 340 by 10 feet at six inches compacted.
- 3,400 sq ft x 6 / 12 = 1,700 cu ft
- 1,700 / 27 = 62.96 cu yd, which at 1.50 is 94.4 tons
- With the ten percent ticked: 69.26 cu yd, about 103.8 tons
The soft approach to a low-water crossing. 30 by 12 feet, dug out and rebuilt at ten inches.
- 360 sq ft x 10 / 12 = 300 cu ft
- 300 / 27 = 11.11 cu yd, or 16.7 tons
A bin or equipment pad. 24 by 30 feet at eight inches, because a loaded machine parks in one spot.
- 720 sq ft x 8 / 12 = 480 cu ft
- 480 / 27 = 17.78 cu yd, or 26.7 tons
On northern claypan, where water perches on the subsoil from late autumn into spring, take the deeper end of any range and shape a crown so rain leaves the surface. On rocky Ozark ground the subgrade is often chert and rock once the soft material is scraped off, which is firmer to build on than it looks.
Two Passes, One Delivery Date
Most drives are two orders. Run the base course first, then run the surfacing layer as a second calculation and add the tonnages. Two inches of driveway gravel over that same 340 by 10 foot lane is 567 cubic feet, 20.99 cubic yards, about 29.4 tons at 1.40. Missouri quarries also sell that surfacing grade as road rock.
Base work runs from spring into late autumn here; frozen ground in midwinter and saturated ground after heavy spring rain are what hold a lane up. When the tonnage looks right, set the quantity and a date on the product page. Delivery is arranged at checkout by ZIP code and the truck needs clear access to a dump spot, so on a long lane pick two firm spots along the run rather than one pile at the gate.
Common questions
Does the ten percent box cover what a roller takes out of a lane?
No. Treat it as cover for spillage and rough handling. Compaction is handled by building the lane in lifts of four inches or less and rolling each one, and by ordering against the finished depth you want rather than the depth of the loose pile.
The lane climbs a bank to the barn. Do I measure the slope or the flat distance?
The slope. Run the tape along the ground you will drive on, because that is the surface the stone has to cover. Held level, the tape shortens a steep pull by enough to notice.
My parking area turns a corner around the shop. Can I do it in one go?
Yes. Multiple areas takes up to five rectangles that get added together, so split the corner into two legs that do not overlap and enter each one. If the leg nearest the door needs more depth, give it its own depth rather than averaging the two.
Should the grass shoulder go into my width?
Only if stone is going on it. Measure the running surface you intend to keep stoned. A foot of shoulder each side over a couple of hundred feet is a real tonnage, and it is the commonest reason a first order feels generous.
How do I work out the base and the surface as separate deliveries?
Run the tool twice over the same footprint, once at the base depth with base rock selected and once at two to three inches with driveway gravel. Order both together if the lane is ready for the whole build, or take the base first and the surfacing once it has been rolled and has had some traffic on it.
Related calculators
Thirty tons. Zero delivery fees.
Road base priced per ton, hauled free, at lane quantities where hauling usually costs the most.
