How Much River Rock for a 6x100 Walkway?
How much river rock for a 6x100 walkway is a quick volume problem. 600 square feet at 3 inches comes to 5.56 cubic yards. River rock usually weighs about 1.25 to 1.45 tons per cubic yard, so plan on roughly 7.5 tons.
Volume and tonnage calculator →The math for a 6x100 walkway
- Area: 6 × 100 = 600 sq ft.
- Depth in feet: 3 ÷ 12 = 0.250 ft.
- Cubic feet: 600 × 0.250 = 150.0 cu ft.
- Cubic yards: ÷ 27 = 5.56 yd³.
- Tons: × 1.35 = 7.5 tons.
The volume and tonnage calculator does this for any size.
River rock needed by depth
| Depth | Cubic yards | Tons (approx.) | Tons +10% |
|---|---|---|---|
| 2 in | 3.70 | 5.0 | 5.5 |
| 3 in | 5.56 | 7.5 | 8.2 |
| 4 in | 7.41 | 10.0 | 11.0 |
About river rock
River rock is smooth, water-worn stone sold in sizes from about 3/4 inch to several inches. Larger sizes cover fewer square feet per ton at the same depth because the voids between stones are bigger. Ask your supplier for their own tons-per-yard figure, since stone source and moisture shift it.
Preparing the walkway
Dig the path a few inches below grade, compact the bottom, add fabric if needed and install edging on both sides so the material stays on the walk. For foot traffic, the depths in the table above are a reasonable starting range.
Ordering tips
- Round up. Compaction and uneven ground eat material. Adding about 10 percent is common.
- Delivery size. 8.2 tons fits in a single typical dump truck load; small loads may carry a delivery fee. See how many tons of gravel in a dump truck.
- Bulk vs bags. At this size bulk delivery is usually the practical choice.
- Where it drops. Have the truck dump as close to the walkway as firm ground allows.
When to choose river rock
Good uses:
- Dry creek beds and drainage swales
- Decorative borders and planting beds
- Around downspouts to stop splash erosion
Poor fit for:
- Walking surfaces
- Driveways
- Bases under slabs or pavers
Quick reference numbers
- Per inch over 100 sq ft: about 0.42 tons of river rock (0.31 cubic yards).
- Per inch over 1,000 sq ft: about 4.2 tons.
- Another size for comparison: a 10x20 area at 4 inches takes about 3.3 tons.
- Weight used here: about 1.35 tons per cubic yard.
Where estimates go wrong
- Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
- Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
- Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
- Forgetting that compaction shrinks loose material. A loose 4-inch spread of a dense-graded stone may finish closer to 3 inches after rolling.
Questions people ask
How many tons of river rock for a 6x100 walkway?
About 7.5 tons at 3 inches deep, or 8.2 tons with 10 percent extra.
How many cubic yards is a 6x100 walkway at 3 inches?
About 5.56 cubic yards.
How much does a cubic yard of river rock weigh?
Usually around 1.25 to 1.45 tons, depending on stone size, fines and moisture.
How deep should river rock be for a walkway?
The table above shows 2 to 4 inches. Shallower depths suit top dressing; deeper depths suit new installs and heavier use.
How many square feet is 6x100?
600 square feet.
Related guides
- How Much Does a Ton of River Rock Cover?
- Tons to Cubic Yards for Gravel: Conversion Chart
- How Many Tons of Gravel in a Dump Truck? Loads and Coverage
- How Much Does a Ton of Gravel Cover? Depth Chart
- How Much River Rock for a 6x60 Walkway?
- How Much River Rock for a 6x75 Walkway?
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