Stone Yardage Calculator
The Stone Yardage Calculator is a free tool that answers the question every driveway, path, patio base, and garden project starts with: how much stone do I actually need to order? You enter the length and width of the area in feet and the depth of stone in inches, and the Stone Yardage Calculator returns the amount in cubic yards, an estimated weight in tons, and the coverage area in square feet, all at once.
Ordering stone is unforgiving in both directions. Order too little and the job stops while you wait for a second delivery, often with an extra delivery charge. Order too much and you are left with a pile of gravel to move, store, or pay to remove. Suppliers sell stone by the cubic yard or by the ton, while homeowners measure their projects in feet and inches, and the conversion between those worlds is where most mistakes happen. The Stone Yardage Calculator bridges that gap in seconds.
This page explains how the Stone Yardage Calculator works, how volume, yardage, weight, and coverage fit together, and how to measure your project so the numbers you enter are the numbers your site actually needs. You will find a step-by-step usage guide, two fully worked examples with real project figures, a deeper look at depths for different jobs, compaction, and ordering strategy, practical tips from the trade, and answers to the fifteen questions people ask most before ordering stone.
From Feet and Inches to Cubic Yards
Stone is sold by volume, and the standard unit for bulk stone is the cubic yard: a cube measuring 3 feet on every side, which contains 27 cubic feet. To find the volume of a project, the Stone Yardage Calculator multiplies the length by the width to get the area, then multiplies by the depth, first converting the depth from inches into feet by dividing by 12. That gives a volume in cubic feet, which is then divided by 27 to convert it into cubic yards.
The depth conversion is where hand calculations most often go wrong. Four inches is a third of a foot, not four feet, and forgetting that step inflates an order twelve times over. The Stone Yardage Calculator handles the conversion silently and correctly every time, so a 20 foot by 10 foot area at 4 inches deep correctly comes out at about 2.47 cubic yards instead of an alarming and expensive mistake.
Why the Calculator Also Estimates Tons
Some suppliers price stone by the cubic yard and others by the ton, and delivery trucks are limited by weight as much as by volume. To make quotes from different suppliers comparable, the Stone Yardage Calculator converts cubic yards into tons using a standard average density for crushed stone and gravel of about 1.4 tons per cubic yard. On that basis, the 2.47 cubic yards in the example above weigh about 3.46 tons.
Real stone varies a little with rock type and moisture. Dense granite gravel sits at the heavier end, lighter decorative aggregates at the lower end, and wet stone weighs more than dry stone from the same pile. Treat the tonnage from the calculator as a solid planning estimate, and mention the stone type when you order so the supplier can adjust the figure with their own conversion for the material in their yard.
Coverage Area: The Third Useful Number
The third output, coverage area, is simply the length multiplied by the width, in square feet. It sounds too simple to matter, but it earns its place. Coverage area is the figure you need for landscape fabric, weed membrane, and edging, all of which are sold by the square foot or by the roll. It is also the number that lets you compare quotes quickly, because suppliers sometimes describe a load by the area it covers at a stated depth.
Coverage also works backwards as a planning check. If you already have a pile of stone and know its volume, dividing that volume by a planned depth tells you the area it will cover. The Stone Yardage Calculator focuses on the forward direction, from measurements to order quantity, but keeping the area figure in view helps you sense-check everything: a 200 square foot project at 4 inches deep should need roughly two and a half cubic yards, every time.
How to Use the Stone Yardage Calculator
The Stone Yardage Calculator needs three measurements from your project. Measure the area carefully with a tape, in feet, and decide on a depth based on the guidance later in this page, then follow these steps.
- Enter the length of the area in feet in the first box. For irregular shapes, use the longest measurement and see the tips below.
- Enter the width of the area in feet in the second box.
- Enter the depth of stone in inches in the third box. Four inches is typical for a driveway base, two to three inches for a decorative top layer.
- Click the Calculate button and the results box appears below the buttons.
- Read the stone needed in cubic yards, the weight estimate in tons, and the coverage area in square feet.
- Round the yardage up sensibly when you order, and add a small allowance for compaction and spillage. Click Reset to measure another area.
Worked Example 1: A Driveway Base 20 Feet by 10 Feet at 4 Inches
Step 1: Note the inputs.
The length is 20 feet.
The width is 10 feet.
The depth is 4 inches.
Step 2: Work out the coverage area.
Area equals length multiplied by width.
20 multiplied by 10 equals 200.
The coverage area is 200.00 sq ft.
Step 3: Convert the depth and find the volume.
4 inches divided by 12 equals 0.333 feet.
Volume equals 20 multiplied by 10 multiplied by 0.333, which is 66.67 cubic feet.
Step 4: Convert cubic feet to cubic yards.
Divide the cubic feet by 27.
66.67 divided by 27 equals 2.47 when rounded.
The stone needed is 2.47 cubic yards.
Step 5: Estimate the weight.
Multiply the cubic yards by 1.4 tons per yard.
2.47 multiplied by 1.4 equals 3.46 when rounded.
The weight estimate is 3.46 tons.
Step 6: Check the results in the Stone Yardage Calculator.
Entering 20, 10, and 4 returns exactly these three figures.
In practice you would order 3 cubic yards to allow for compaction and uneven ground.
Worked Example 2: A Garden Path 15 Feet by 12 Feet at 3 Inches
Step 1: Note the inputs.
The length is 15 feet.
The width is 12 feet.
The depth is 3 inches.
Step 2: Work out the coverage area.
Area equals length multiplied by width.
15 multiplied by 12 equals 180.
The coverage area is 180.00 sq ft.
Step 3: Convert the depth and find the volume.
3 inches divided by 12 equals 0.25 feet.
Volume equals 15 multiplied by 12 multiplied by 0.25, which is 45 cubic feet.
Step 4: Convert cubic feet to cubic yards.
Divide the cubic feet by 27.
45 divided by 27 equals 1.67 when rounded.
The stone needed is 1.67 cubic yards.
Step 5: Estimate the weight.
Multiply the cubic yards by 1.4 tons per yard.
1.67 multiplied by 1.4 equals 2.33 when rounded.
The weight estimate is 2.33 tons.
Step 6: Plan the order.
A single bulk bag holds roughly a cubic yard, so two bags cover this path with a little spare.
Alternatively, one bulk delivery of 2 cubic yards leaves extra for topping up after the path settles.
Choosing the Right Depth for the Job
Depth is the input that most changes the order, and the right depth depends on the job. A driveway or parking area that carries vehicles usually needs 4 to 6 inches of compacted stone over a firm base, laid in layers. A patio or shed base typically needs 3 to 4 inches. A footpath is comfortable at 2 to 3 inches, and a purely decorative mulch replacement can work at 2 inches, which is enough to hide the membrane below.
Going too shallow is the classic false economy. Stone spread thin migrates, exposes the fabric or soil beneath, and needs topping up within a season, and the second small delivery usually costs more per yard than a single generous first order. Going too deep wastes money and can leave vehicles ruts in loose material. Match the depth to the traffic the surface will carry, enter it honestly in the Stone Yardage Calculator, and the yardage will look after itself.
Compaction and Settling: Why You Need a Little Extra
Loose stone compacts. When a load is tipped, spread, and rolled or driven over, the pieces lock together and the layer typically loses around 10 to 20 percent of its loose depth. Ground underneath also matters: soft soil, recent digging, and hidden dips all swallow stone before the surface starts to build up. The volume the Stone Yardage Calculator returns is the neat geometric volume of the finished layer, not the loose volume that arrives on the truck.
Experienced landscapers therefore order the calculated yardage plus an allowance, commonly around 10 percent, and more on soft or uneven ground. The small surplus also covers spillage during barrowing and the stone that inevitably migrates beyond the edging on day one. A quarter yard left over is a minor inconvenience; a quarter yard missing stops the whole job, so the allowance is always the cheaper choice.
Rectangles, Circles, and Awkward Shapes
The Stone Yardage Calculator is built for rectangular areas, which covers most driveways, paths, and bases. For an L-shaped project, split it into two rectangles, run the calculator twice, and add the yardage together. For a triangular corner, calculate it as a rectangle and halve the result. These two tricks handle nearly every real garden layout.
Circular areas need one extra step: multiply the radius by itself and then by 3.14 to get the area in square feet, then use an equivalent rectangle with the same area in the calculator by entering that area as a length of the same value and a width of 1 foot, adjusting depth as normal, or simply run the area through the same volume maths yourself. What matters is that the total volume is right; the shape only changes how you arrive at the area.
Tips for Ordering the Right Amount of Stone
- Tip 1: Measure the length and width twice, at different points, and use the larger figures where the ground is uneven.
- Tip 2: Decide the depth from the traffic the surface will carry, not from the size of the pile you hope to buy.
- Tip 3: Add around ten percent to the calculated yardage for compaction, settling, and spillage.
- Tip 4: Ask the supplier whether they price by the yard or by the ton, and use both calculator outputs to compare quotes.
- Tip 5: Mention the stone type when ordering so the supplier can refine the tonnage estimate for that material.
- Tip 6: Split L-shaped and irregular projects into rectangles and add the separate results together.
- Tip 7: Arrange delivery as close to the working area as the truck can safely reach, to cut barrowing time.
- Tip 8: Keep a note of the yardage used and the depth laid, so topping up in future years takes seconds to work out.
Frequently Asked Questions
1. How much stone do I need for my project?
Enter your length and width in feet and your depth in inches into the Stone Yardage Calculator.
It returns the exact cubic yards for the neat volume of the layer, plus a weight estimate and the coverage area.
2. How is cubic yardage calculated?
Multiply length by width by depth, with depth converted from inches to feet, to get cubic feet.
Divide the cubic feet by 27, because one cubic yard contains 27 cubic feet.
3. How many tons are in a cubic yard of stone?
A cubic yard of typical crushed stone or gravel weighs about 1.4 tons.
The exact figure varies a little with rock type and moisture, which is why the calculator figure is an estimate.
4. What depth of stone do I need for a driveway?
Most driveways need 4 to 6 inches of compacted stone in total, often laid as a base layer and a surface layer.
Enter the combined depth into the calculator, or work out each layer separately and add them.
5. What depth do I need for a garden path?
A footpath usually works well at 2 to 3 inches of stone over a firm, level base.
That depth hides the membrane below while staying comfortable to walk on.
6. Why does the calculator ask for depth in inches?
Stone depths are small, and inches are the unit people naturally use for them.
The calculator converts inches to feet for you, removing the most common source of ordering mistakes.
7. Should I order extra stone?
Yes. Add around ten percent for compaction, settling into the ground, and spillage.
Running short and paying for a second delivery almost always costs more than a small surplus.
8. Can I use the calculator for gravel and mulch?
Yes. The volume maths is identical for gravel, crushed stone, and similar loose materials.
Only the weight per yard changes, so treat the tonnage as a stone estimate and ask the supplier for the figure for lighter materials.
9. How do I measure an irregular area?
Divide the area into simple rectangles, calculate each one, and add the yardage figures together.
For a triangular section, calculate it as a rectangle and halve the result.
10. What if my supplier sells by the ton?
Use the weight estimate from the calculator as your order quantity.
Tell the supplier the stone type as well, because they may apply a slightly different tons-per-yard figure for it.
11. How many bulk bags equal a cubic yard?
A standard bulk bag holds roughly 0.7 to 1 cubic yard depending on the supplier and material.
Check the stated volume on the bag and compare it with the yardage from the calculator before ordering.
12. Does the calculator account for compaction?
No. It returns the neat geometric volume of the finished layer.
Add your own allowance of around ten percent when ordering, as the tips section explains.
13. Can I calculate a circular area?
Work out the circle area first by multiplying the radius by itself and then by 3.14.
Then use that area with your chosen depth to find the volume, following the same method the calculator uses.
14. How much area does one cubic yard cover?
At 3 inches deep, one cubic yard covers about 108 square feet.
At 4 inches deep it covers about 81 square feet, and at 2 inches deep about 162 square feet.
15. Is the Stone Yardage Calculator free?
Yes, it is free to use with no account and no limit on the number of areas you measure.
Use it for every layer and every section of a larger project.
CONCLUSION
Ordering stone stops being a gamble once the volume maths is done properly. The Stone Yardage Calculator takes your length, width, and depth and returns the cubic yards to order, the tons to expect, and the area you are covering, in one view. Measure carefully, choose the depth the job deserves, add a sensible allowance for compaction, and your stone will arrive in the right quantity, once, ready to finish the project in a single push.