#67 Stone: Size, Weight, Uses and #67 vs #57

#67 stone is a clean crushed stone sized from about 3/4 inch down to roughly 3/16 inch, with the dust and sand-sized fines screened or washed out. It sits one step smaller than the better-known #57 stone. That makes it a favorite coarse aggregate for concrete, a tidy drainage stone, and a neat top dressing for paths and driveways. It weighs around 1.2 to 1.4 tons per cubic yard, so a ton covers a little over 100 square feet at 2 inches. Below is what the number means, how it compares with #57, what it is good and bad at, and how to work out how many tons to order.

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What the number 67 means

Aggregate size numbers come from standard tables that most state highway departments and suppliers follow, chiefly ASTM C33 for concrete aggregate and AASHTO M 43. A two-digit number like 67 is shorthand for a blend of two single sizes: size 6 (roughly 3/4 to 3/8 inch) and size 7 (roughly 1/2 inch down to the No. 4 sieve). Put together, they give a stone that runs from 3/4 inch down to pea size. Under the common size 67 limits:

Sieve opening	Share passing (by weight)
1 inch	100%
3/4 inch	90 to 100%
3/8 inch	20 to 55%
No. 4 (about 3/16 inch)	0 to 10%
No. 8 (about 3/32 inch)	0 to 5%

In plain terms, nothing is bigger than an inch, almost everything is 3/4 inch or smaller, roughly half to three quarters of the stone is caught between the 3/4 and 3/8 inch screens, and there is very little fine material at the bottom. State specs and individual quarries can shift these limits slightly, so ask for the gradation sheet if your plans call for an exact size.

#67 stone vs #57 stone

These two are the clean stones people mix up most. Both are crushed, angular and nearly free of fines. The difference is size. #57 stone reaches up to about 1 inch, with a few pieces near 1 1/2 inches, and has fewer small pieces. #67 tops out near 3/4 inch and carries more stone in the 3/8 inch range.

	#57 stone	#67 stone
Typical size range	about 1/2 to 1 inch (some up to 1 1/2)	about 3/16 to 3/4 inch
Drainage	slightly faster, bigger voids	very good, slightly smaller voids
Feel underfoot	chunkier, rolls more	smoother, easier to walk on
Concrete use	common in thicker slabs, footings and walls	common in thinner slabs and around tight rebar
Weight per cubic yard	about 2,400 to 2,800 lb	about 2,400 to 2,800 lb

For a French drain or a drainage blanket, either will work, and many contractors simply use whichever the local yard keeps in stock. If you want a smaller look on a walkway or a driveway top layer, #67 is the friendlier choice. If you need something smaller still, #8 stone runs about 3/8 inch.

Do not confuse #67 with 3/4 minus

A yard may sell #67 as “3/4 clean,” “3/4 inch washed,” or just “3/4 gravel.” That is a different product from 3/4 minus (also called 3/4 crusher run or road base), which keeps all the fines from 3/4 inch down to dust. The fines are what make road base pack hard, and their absence is what makes #67 drain. Ordering the wrong one is a common and expensive mix-up, so say “clean” or “washed” when you want #67, and see what road base is for the packing kind. Our 3/4 inch clean stone guide covers the generic product many yards sell under that name.

What #67 stone is used for

Concrete aggregate. It is one of the standard coarse aggregate sizes in ready-mix. A common design rule is to keep the largest stone no bigger than about a third of the slab thickness and three quarters of the clear gap between reinforcing bars, which is why the 3/4 inch top size of #67 suits 4 inch slabs and tightly reinforced pours. See the concrete mix ratio guide for bagged and site-mixed batches.
Drainage. French drains, foundation drains, behind retaining walls and around drain pipe. Wrap it in filter fabric where soil could wash into the voids. Best gravel for a French drain and drainage gravel around a foundation go deeper.
Pipe bedding. Many utility specs allow a clean 3/4 inch stone to bed and surround water, sewer and drain lines.
Shed and equipment pads. A clean stone pad drains well and settles firmly when compacted. The gravel shed foundation post covers layout and depth.
Driveway and path top layers. A few inches of #67 over a compacted base gives a clean, uniform surface. Driveway gravel sizes explains which stone goes in each layer.

Where #67 falls short

Because it has no fines, #67 never locks into a hard crust the way dense-graded base does. Spread thick on its own, it shifts under tires, ruts on hills and can be tiring to walk through. On driveways, put it over 4 to 8 inches of compacted road base or crusher run and keep the clean layer to about 2 to 3 inches. Edging helps keep it from wandering into the lawn. A plate compactor will settle and nest the stones, but expect a firm, slightly loose surface rather than a solid one.

How much #67 stone weighs

Most quarries figure clean 3/4 inch stone at about 2,400 to 2,800 pounds per cubic yard, or roughly 1.2 to 1.4 tons. Granite and trap rock tend to run heavier than many limestones, and wet stone weighs more than dry stone. Clean stone does not shrink much when it is spread, so the loose and placed weights are close. If your supplier gives a specific number, use theirs. Our gravel weight per yard chart compares other stone types.

How many tons of #67 stone you need

Measure the area in square feet, pick a depth in inches, and use about 1.4 tons per cubic yard:

Tons ≈ area (sq ft) × depth (in) × 0.0043
Coverage of one ton ≈ 231 ÷ depth (in), in square feet

Depth	Approx. area one ton covers	Tons per 100 sq ft
2 inches	about 115 sq ft	about 0.9
3 inches	about 75 sq ft	about 1.3
4 inches	about 58 sq ft	about 1.7
6 inches	about 39 sq ft	about 2.6

Example: a 10 by 12 foot shed pad, 4 inches deep. 10 × 12 = 120 square feet. 120 × 4 × 0.0043 = about 2.1 tons. Add 10 percent for edges and settling and order about 2.3 tons.

Example: a French drain trench 50 feet long, 12 inches wide and 18 inches deep. 50 × 1 × 1.5 = 75 cubic feet, or about 2.8 cubic yards. At 1.4 tons per yard that is about 3.9 tons, before subtracting the small space the pipe takes up. Ordering 4 tons is a sensible round number. For other conversions, see tons to cubic yards for gravel.

Buying tips

Ask by size number and by “clean” or “washed.” That avoids getting a stone with fines when you need drainage.
Check the minimum. Many quarries sell by the ton with a delivery minimum, so small jobs may cost less if you pick up a load in a pickup or trailer.
Look at the pile. Color and shape vary with the rock source. Gray limestone, pink or tan granite and dark trap rock all get sold as #67.
Plan where the truck dumps. A dump truck can crack a thin driveway or sink in a soft lawn, so pick a firm spot close to the work.

Questions people ask

What size is #67 stone?

Most of it falls between about 3/4 inch and 3/16 inch. Under the common ASTM C33 and AASHTO M 43 size 67 limits, all of it passes a 1 inch screen, nearly all passes 3/4 inch, and only a small share is smaller than a No. 4 sieve.

What is the difference between #57 and #67 stone?

Both are clean crushed stone with almost no fines. #57 is a size larger, reaching up to about 1 inch with some pieces near 1 1/2 inches, while #67 tops out near 3/4 inch and carries more pea-sized pieces. #57 drains a bit faster; #67 sits a bit tighter and is easier underfoot.

How much does a yard of #67 stone weigh?

Roughly 2,400 to 2,800 pounds, or about 1.2 to 1.4 tons per cubic yard, depending on the rock type and moisture. Ask your quarry for its own weight per yard.

How much does a ton of #67 stone cover?

Using about 1.4 tons per cubic yard, one ton covers roughly 115 square feet at 2 inches deep, 75 square feet at 3 inches, or 58 square feet at 4 inches.

Is #67 stone good for a driveway?

It makes a clean, neat top layer over a compacted dense-graded base, but on its own it does not lock together and can shift or rut, especially on slopes. Put road base or crusher run under it.

Is #67 stone the same as 3/4 minus?

No. 3/4 minus contains all the fine material and packs hard like road base. #67 has the fines washed or screened out, so it drains instead of packing.

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