Step 1: Measure the Area in Square Feet
Start with a tape measure and get the length and width of the area the stone will cover, then multiply them for square feet. For a rectangular driveway or pad that is all you need. For an odd shape, break it into rectangles, measure each one, and add the areas together — that is more accurate than trying to average a curve. Measure to where the stone actually stops, not to a property line or a fence, because you are ordering to cover the real footprint, not the lot.
Step 2: Choose the Finished Depth
Decide how deep the stone will sit and convert inches to feet by dividing by 12 (so 4 inches is 0.33 ft, 6 inches is 0.5 ft). Depth is where people under-order most. A single course runs 3–4 inches for a top layer or 4–6 inches for a base. A full gravel driveway is not one shallow dump — it is layers that add up to roughly 8–12 inches of total stone, and each layer has its own depth. If you are building the whole thing, size each layer separately; our gravel driveway installation guide lays out the three-layer system, and gravel types for driveways covers which stone goes in each.
Step 3: Convert to Cubic Yards
Multiply your square feet by the depth in feet to get cubic feet, then divide by 27 to get cubic yards — because one cubic yard equals 27 cubic feet (a 3 × 3 × 3 ft box). Cubic yards is the unit quarries and volume calculators think in, so this is the number that bridges your tape-measure work to something you can actually order against. Write it down; you will need it for the next step and for cross-checking any quote.
Step 4: Convert Cubic Yards to Tons
Gravel is sold and trucked by weight, so turn cubic yards into tons by multiplying by the density of crushed stone — roughly 1.4 to 1.5 tons per cubic yard. Using about 1.45 as a middle figure, 5 cubic yards is around 7 tons. As a quick field check, remember the coverage rule: one ton of crushed stone covers about 100 square feet at 2 inches deep. If your calculated tonnage is wildly off what that rule suggests for your area and depth, re-check your measurements. Clean, washed, or decorative stone weighs a little differently, and drainage rock has its own density, so use the matching calculator for those rather than assuming crusher-run numbers.
Step 5: Add a Compaction and Waste Allowance
Finally, add about ten percent to your tonnage before you order. Crushed stone compacts as it is rolled — loose stone settles into a thinner, denser layer, so the in-place volume is less than what you spread. On top of that, spreading is never perfectly even, low spots eat extra stone, and a little is always lost to spillage. Ten percent covers all of it. Rounding up is cheap; coming up short means a second delivery and often a second trip charge, which costs far more than the stone you were missing. Leftover gravel is never wasted either — it tops soft spots and potholes for years.
A Worked Example
Say you are surfacing a driveway 12 ft wide by 100 ft long with a 4-inch top course. Area is 12 × 100 = 1,200 sq ft. Depth is 4 ÷ 12 = 0.33 ft. Volume is 1,200 × 0.33 = 400 cubic feet, and 400 ÷ 27 ≈ 14.8 cubic yards. At about 1.45 tons per yard that is roughly 21.5 tons, and adding ten percent brings you to about 24 tons to order. Notice that lands near a full truck — a good moment to confirm the truck size with the quarry so you fill one load instead of splitting into two. The Gravel Calculator runs this whole chain for you and lets you size each layer of a multi-course driveway in seconds.
Frequently Asked Questions
How do I convert cubic yards of gravel to tons?
Multiply cubic yards by the density of crushed stone, which runs roughly 1.4 to 1.5 tons per cubic yard. So 5 cubic yards is about 7 to 7.5 tons. Gravel is sold and hauled by the ton, so this is the conversion that turns your measurements into an order. The Gravel Calculator applies this density for you automatically.
How much area does a ton of gravel cover?
One ton of crushed stone covers roughly 100 square feet at 2 inches deep. That coverage rule scales with depth: the same ton covers about half the area at 4 inches deep, or twice the area at 1 inch. It is a handy field check against a calculated tonnage, but for an actual order run your real dimensions through the Gravel Calculator rather than eyeballing it.
How much extra gravel should I order for compaction?
Add about ten percent to your calculated tonnage. Crushed stone settles as it is compacted, spreading is never perfectly even, and a little is lost to low spots and spillage. Ordering ten percent over is cheap insurance against coming up short and paying a second trip charge, and any leftover stone is useful for topping soft spots down the road.
What if I ordered too little gravel?
Coming up short usually means a second delivery, and a second delivery can carry its own trip charge, so a small shortfall costs more than the missing stone is worth. That is exactly why the ten percent allowance exists. It is almost always cheaper to round up and stockpile a little extra than to under-order and pay to send a truck twice. Our guide to what drives gravel costs explains why that repeat trip charge stings.
Related Calculators
- Gravel Calculator — Runs the whole area-to-tons chain and sizes each layer
- Drainage Rock Calculator — Size clean rock for ditches and culverts at its own density
- Gravel Prices by State — Turn your tonnage into a realistic local cost
- Gravel Types for Driveways — Which crushed product belongs in which layer
Written by Daniel McCarney — AceCalc