Dry Stack Stone Wall Calculator
A dry-stack stone wall is priced and delivered by the ton, so getting the tonnage right up front matters. Enter your wall’s length, height, and thickness to get a tonnage estimate and bulk cost.
Measure straight across the widest point.
Wall thickness (front to back)
Covers spillage and compaction. 5–10% is normal.
Everything is calculated in your browser. Nothing you type is sent anywhere or stored.
Bags or bulk delivery?
—
Coverage & weight
Material profile
Stone tonnage starts with volume: multiply the wall’s length, average thickness, and height (converted to feet) to get cubic feet, then convert to cubic yards. Multiply cubic yards by the stone’s weight per cubic yard, which varies by stone type, to get tons. Add a waste percentage for irregular fit and breakage, then round up to the nearest half or whole ton since most quarries sell by the ton, not the pound.
Dry-Stack Wall Thickness by Height
Dry-stack (mortarless) walls rely on mass and batter, a slight inward lean, for stability, so taller walls need a thicker base.
| Wall Height | Recommended Base Thickness | Notes |
|---|---|---|
| Under 18 in (edging or border) | 8-10 in | Single-wythe, minimal batter needed |
| 2-3 ft (freestanding garden wall) | 16-20 in | Use 1-2 in of batter per foot of height |
| 3-4 ft (low retaining wall) | 24-30 in | Check local code before retaining more than 3 ft of soil |
| Over 4 ft (retaining) | 36 in or more, engineered | Requires engineered design and permit in most jurisdictions |
Stone weight by type
| Type | Weight per yd³ | Best for | Drainage |
|---|---|---|---|
| Fieldstone | 2,700 lb | Natural, irregular dry-stack walls | Free-draining, no fines |
| Limestone wall stone | 2,500 lb | Flatter-bedding stone, easier stacking | Free-draining, no fines |
| Granite wall stone | 2,900 lb | Very durable, heavier walls | Free-draining, no fines |
Figures are for dry material. Wet or freshly delivered material can weigh noticeably more.
How to calculate wall stone you need
- Measure the wall’s length and height in feet, and its average thickness in inches.
- Convert thickness to feet and multiply length by thickness by height to get cubic feet.
- Divide by 27 to convert cubic feet to cubic yards.
- Multiply cubic yards by the weight per cubic yard for your stone type, which varies by stone density.
- Add waste typically 10% for breakage and irregular stone fit, then round up to the ton.
Worked example
Here’s the math for a 20 ft long, 3 ft tall wall with an 18 in average thickness, using fieldstone.
- Wall dimensions20 ft long x 3 ft tall
- Average thickness18 in
- Waste added10%
- Stone selectedFieldstone, 2,700 lb per cu yd
- Volume99.0 cu ft (3.67 cu yd)
- Weight4.95 tons
- Tons to order5.0 tons
- Bulk cost$810.00
Recommended depth by project
| Project | Recommended depth | Notes |
|---|---|---|
| Garden edging or border wall | 8-10 in thick | Under 18 in tall, single-wythe, minimal batter needed |
| Freestanding garden wall | 16-20 in thick | 2-3 ft tall, this example, use batter for stability |
| Low retaining wall | 24-30 in thick base | 3-4 ft tall, check local code before retaining soil |
| Taller retaining wall | 36 in or more, engineered | Over 4 ft, requires engineered design and permit in most areas |
Bags or bulk delivery?
At a few hundred pounds, bagged stone from a home center makes sense. Once you’re into multiple tons, like most dry-stack walls, bulk delivery is almost always cheaper per pound and saves you dozens of trips hauling bags.
- Go bulk past about half a tonmost stone yards deliver by the pallet or dump-truck load, and bulk pricing per ton beats bagged pricing per pound once you’re past a small accent project.
- Ask about pallet weight limitsstone is sold on pallets rated for a specific weight, so confirm your delivery truck and driveway can handle the load.
- Order a little extra, not a little shortrunning short mid-wall means a second delivery fee that often costs more than the stone you were trying to save.
- Check stone selection in person when possiblenatural stone varies piece to piece, and seeing the pallet before it’s delivered helps you judge color and shape consistency.
Common mistakes
- Skipping the base course prepA dry-stack wall built on unlevel or uncompacted ground will settle unevenly and can lean or collapse within a season or two.
- No batter on freestanding wallsA perfectly vertical dry-stack wall relies entirely on friction and is far more prone to toppling than one built with a slight inward lean.
- Underestimating wasteIrregular fieldstone has more waste from breakage and poor-fitting pieces than cut or squared stone, so budget the full 10% or more.
- Retaining soil without drainageWater trapped behind a dry-stack retaining wall builds pressure that mortar-free stacking can’t resist, leading to bulging or failure.
What this calculator assumes
Adjust your result if your project differs from these.
- Wall is measured as a simple rectangular face (length by height), with average thickness applied uniformly.
- Stone weight per cubic yard is based on the selected stone type’s typical density.
- Waste percentage accounts for breakage and irregular stone fit, common with natural dry-stack material.
- Tonnage is rounded up to account for how quarries and stone yards sell by the ton.
Common questions
How thick should a dry-stack wall be?
A freestanding garden wall 2-3 ft tall typically needs 16-20 in of average thickness. Taller or retaining walls need more, and walls over 4 ft usually need an engineered design.
Do I need mortar for a dry-stack wall?
No, that’s the point of dry-stack construction. It relies on stone weight, friction, and batter (inward lean) instead of mortar for stability.
How much stone waste should I plan for?
10% is a reasonable starting point for irregular fieldstone. Squared or cut veneer stone typically has less waste.
Can I buy stone in bags instead of bulk for a wall this size?
Bagged stone works for very small projects, but at multiple tons it’s far more cost-effective to order bulk, delivered by the pallet or dump truck.
Does a dry-stack retaining wall need drainage?
Yes. Any wall holding back soil needs a gravel drainage zone behind it, since trapped water pressure is the leading cause of failure in mortarless walls.
Embed this calculator
Related calculators
Dry Stack Stone Wall Calculator Estimate
—
materialcalculate.com/tools/dry-stack-stone-wall-calculator/
Project
| Shape | — |
| Dimensions | — |
| Depth | — |
| Area | — |
| Material | — |
| Waste allowance | — |
Volume & weight (incl. waste)
| Cubic yards | — |
| Cubic feet | — |
| Weight | — |
| Tons (rounded up) | — |
Shopping list
| Bulk order | — |
| Bagged alternative (0.5 cu ft) | — |
| Estimated cost | — |
Notes
Estimate generated by materialcalculate.com. Assumes uniform depth and standard dry material densities. Confirm quantities with your supplier before ordering.