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River rock chip chart calculator
Put your area, depth and waste allowance in: 1000 square feet at 4 inches with 10% waste needs 1,100.00 square feet, 13.58 cubic yards exact, order 14 cubic yards.
★ CONSTRUCTION · MATERIALS · RIVER ROCK CHIP CHART
River Rock Chip Chart: 14 Yards, 1000 Sq Ft at 4 Inches
On the defaults — 1000 square feet at 4 inches deep with a 10% waste allowance — river rock chips need 1,100.00 square feet of coverage, 13.58 cubic yards exact, and an order of 14 cubic yards. This is the RIVER ROCK version of the chip chart — the bluestone-chip-chart page is the BLUESTONE version — the same area, depth and waste model for bluestone chips; the sandstone-chip-chart page is the SANDSTONE version — the same model for sandstone chips; the slate-chip-chart page is the SLATE version — the same model for slate chips; and the granite-chip-chart page is the GRANITE version — the same model for granite chips.
What does 13.58 cubic yards of river rock chips mean?
It means that a 1000-square-foot patio at 4 inches deep needs 1,100.00 square feet of coverage once a 10% waste allowance is added, and one cubic yard of river rock chips covers 81 square feet at that depth, so the exact figure is 13.58 cubic yards and the order is 14 cubic yards. The two steps are the whole story in miniature: the waste step grows the area before anything is divided, while the coverage step turns that grown area into yards — and the order step rounds up, because a short load leaves the patio thin at the far end. The part people get wrong is dividing the raw area instead of the grown area: 1000 divided by 81 is 12.35 cubic yards, but the honest order is 14, and the missing 1.23 yards is the waste that spreading loss always takes. The other part people get wrong is rounding the exact figure down: 13.58 rounded down is 13 yards, which is well over half a yard short of the grown area.
Three things to check before you trust the number
Is 1000 really the area, or the area plus edging? One thousand square feet is the ground the chips actually cover, and it is the figure the needed area turns on: the 1200-square-foot branch totals 16.30 cubic yards exact against the 13.58 headline, so a 200-square-foot measurement difference is about two and a half yards of stone. Measure length times width of the ground itself, and count edging gaps as waste, not as area — an area padded with edging inflates the order twice, once in the area and once in the waste.
Is 4 inches really the depth? Four inches is the layer depth, and it is the figure the coverage turns on: the 2-inch branch totals 6.79 cubic yards exact against the 13.58 headline, so a 2-inch depth difference is nearly 7 yards of stone over 1000 square feet. Depth is the most powerful input in the model because it sits in the divisor — a shallow estimate is the fastest way to order far too little, and a deep estimate the fastest way to over-order.
Is 10% really your waste allowance? Ten percent is the extra stone for spreading loss, uneven ground and edging gaps, and it is the figure the needed area turns on: the 0%-waste branch totals 12.35 cubic yards exact against the 13.58 headline, so the waste allowance alone is worth 1.23 yards here. Use 0% only for a perfectly flat, exactly measured area; uneven ground, a long haul or many edging gaps all earn the full 10%.
Worked example
On the defaults: 1000 square feet, 4 inches deep, 10% waste allowance.
- Waste factor: 1 + 10 ÷ 100 is 1.10.
- Needed area: 1000 × 1.10 is 1,100.00 sq ft.
- Coverage per cubic yard: 324 ÷ 4 is 81 sq ft.
- Exact cubic yards: 1,100.00 ÷ 81 is 13.58.
- Order: 13.58 rounded up is 14 cubic yards — area times the waste factor, divided by coverage per cubic yard, rounded up to order.
And the other way: the area behind 13.58 cubic yards is 1000 square feet, the depth behind it is 4 inches, and the waste behind it is 10%. With 81 square feet at 4 inches and 0% waste the model honestly shows exactly 1.00 cubic yard, because 81 is exactly one yard of coverage at that depth — an edge that shows the ceiling never rounds an exact integer up.
River rock chip lookup table
Every row below is the same model at 10% waste: needed area is the area times 1.10, coverage is 324 divided by depth, and the order is the exact figure rounded up. Find your area and depth, read across, and order the figure in the last column — do not round down, because a short load leaves the bed thin at the far end.
| Area (sq ft) | Depth (inches) | Needed area (sq ft) | Exact cubic yards | Order |
|---|---|---|---|---|
| 100 | 1 | 110.00 | 0.34 | 1 cubic yard |
| 100 | 2 | 110.00 | 0.68 | 1 cubic yard |
| 100 | 3 | 110.00 | 1.02 | 2 cubic yards |
| 100 | 4 | 110.00 | 1.36 | 2 cubic yards |
| 300 | 1 | 330.00 | 1.02 | 2 cubic yards |
| 300 | 2 | 330.00 | 2.04 | 3 cubic yards |
| 300 | 3 | 330.00 | 3.06 | 4 cubic yards |
| 300 | 4 | 330.00 | 4.07 | 5 cubic yards |
| 1000 | 1 | 1,100.00 | 3.40 | 4 cubic yards |
| 1000 | 2 | 1,100.00 | 6.79 | 7 cubic yards |
| 1000 | 3 | 1,100.00 | 10.19 | 11 cubic yards |
| 1000 | 4 | 1,100.00 | 13.58 | 14 cubic yards |
| 1500 | 1 | 1,650.00 | 5.09 | 6 cubic yards |
| 1500 | 2 | 1,650.00 | 10.19 | 11 cubic yards |
| 1500 | 3 | 1,650.00 | 15.28 | 16 cubic yards |
| 1500 | 4 | 1,650.00 | 20.37 | 21 cubic yards |
Every branch, checked
- 1000 square feet, 4-inch depth, 0% waste: 1000 square feet, 4-inch depth, 0% waste: 12.35 cubic yards exact — order 13 cubic yards.
- 1000 square feet, 2-inch depth, 10% waste: 1000 square feet, 2-inch depth, 10% waste: 6.79 cubic yards exact — order 7 cubic yards.
- 1200 square feet, 4-inch depth, 10% waste: 1200 square feet, 4-inch depth, 10% waste: 16.30 cubic yards exact — order 17 cubic yards.
- 400 square feet, 4-inch depth, 10% waste: 400 square feet, 4-inch depth, 10% waste: 5.43 cubic yards exact — order 6 cubic yards.
The reverses, worked backwards
- Area behind 13.58 cubic yards: 1000 sq ft — at 1000 sq ft the figures are 13.58 cubic yards exact — order 14 cubic yards.; at the lower neighbor the figures are 12.90 cubic yards exact — order 13 cubic yards.; at the upper neighbor the figures are 14.26 cubic yards exact — order 15 cubic yards..
- Depth behind 13.58 cubic yards: 4 inches — at 4 inches the figures are 13.58 cubic yards exact — order 14 cubic yards.; at the lower neighbor the figures are 11.88 cubic yards exact — order 12 cubic yards.; at the upper neighbor the figures are 15.28 cubic yards exact — order 16 cubic yards..
- Waste behind 13.58 cubic yards: 10% waste — at 10% waste the figures are 13.58 cubic yards exact — order 14 cubic yards.; at the lower neighbor the figures are 12.96 cubic yards exact — order 13 cubic yards.; at the upper neighbor the figures are 14.20 cubic yards exact — order 15 cubic yards..
What the defaults assume
The defaults are 1000 square feet at 4 inches deep with a 10% waste allowance, so the headline is one patio for one order with a middling area and a standard walkway depth. The model is a multiplication, a division and a ceiling: the needed area is area times the waste factor, the exact figure is needed area divided by coverage, and the order is the exact figure rounded up. The area reverse is checked at 50 square feet either side, because 50 square feet at 4 inches is about half a yard; the depth reverse is checked at 0.5 inches either side, because half an inch moves the order by whole yards; the waste reverse is checked at 5% either side, because 5% of 1000 square feet is 50 square feet. The model does not include delivery minimums, compaction under foot traffic, or the cost of edging — price those separately, and re-check the order when the measured area changes.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Needed area | area × (1 + waste ÷ 100) | 1,100.00 sq ft — 1000 × 1.10. |
| Coverage per cubic yard | 324 ÷ depth | 81 sq ft — 324 ÷ 4. |
| Exact cubic yards | needed area ÷ coverage | 13.58 — 1,100.00 ÷ 81. |
| Order | exact cubic yards rounded up | 14 cubic yards — 13.58 rounded up. |
| 1000 square feet, 4-inch depth, 0% waste | same model | 12.35 cubic yards exact — order 13 cubic yards. |
| 1000 square feet, 2-inch depth, 10% waste | same model | 6.79 cubic yards exact — order 7 cubic yards. |
| 1200 square feet, 4-inch depth, 10% waste | same model | 16.30 cubic yards exact — order 17 cubic yards. |
| 400 square feet, 4-inch depth, 10% waste | same model | 5.43 cubic yards exact — order 6 cubic yards. |
| Area behind 13.58 cubic yards | reverse | 1000 sq ft: 13.58 cubic yards exact — order 14 cubic yards. |
| Depth behind 13.58 cubic yards | reverse | 4 inches: 13.58 cubic yards exact — order 14 cubic yards. |
| Waste behind 13.58 cubic yards | reverse | 10% waste: 13.58 cubic yards exact — order 14 cubic yards. |
| 0 square feet | same model | 0.00 cubic yards exact — order 0 cubic yards. |
| 81 square feet, 0% waste | same model | 1.00 cubic yards exact — order 1 cubic yard. |
Who uses this
- A homeowner ordering patio stone — 1000 square feet at 4 inches with 10% waste is 13.58 cubic yards exact and an order of 14, with the lookup table covering the common areas and depths without a second calculation.
- A landscaper quoting a walkway — the branches price a shallower depth or a larger area at once, so a quote change can be costed before it is agreed.
- A supplier checking an order — the reverses recover the area, the depth or the waste behind any quoted yardage, so a disputed order can be checked against real measurements.
- A DIY builder planning a delivery — the order column rounds up, so the truck that arrives covers the grown area with stone to spare, not a load that runs out at the far end.
Accuracy & limitations
Figures are the model’s own arithmetic on the numbers you type, computed from unrounded values and displayed rounded HALF_UP to 2dp, with the order rounded up to the next whole cubic yard. The main limitation is the inputs, not the arithmetic: whether the area is the ground the chips cover, whether the depth is the finished layer depth, and whether the waste allowance matches the ground are all judgement calls, and this page prices the figures you enter without checking them. This page is a calculation tool, not a landscaping quote.
Cite this calculator
River rock chips for 1000 sq ft at 4 inches with 10% waste need 1100.00 sq ft, 13.58 cubic yards exact, order 14 cubic yards, plus a 16-row lookup table. Source: Bright Side Kit, https://brightoolbox.com/river-rock-chip-chart/, accessed 29 October 2026.
Frequently asked questions
What are river rock chips used for in a patio or path?
As a smooth, rounded ground cover with a natural stream-bed look: they suppress weeds, hold moisture in the soil, and keep patios and paths looking finished without yearly mulching. River rock chips drain well, which suits walkways and borders, and their mixed grey, tan and rust colours suit stone patios, though the pale pieces show dirt more readily than a dark chip.
How deep should a river rock chip layer be?
Four inches is the working depth for a patio base or walkway: deep enough to cover the ground fully and stay put under foot, without wasting stone. A shallow decorative bed can run 1 inch, while a parking strip or a heavily used path earns a deeper layer — and every extra inch adds roughly a quarter to the order at the same area.
Why add a 10% waste allowance?
Because spreading loss, uneven ground and edging gaps eat stone that the flat area figure never counts: a load measured exactly to the area leaves the far end thin. Ten percent covers normal loss on a measured, fairly flat area; use 0% only when the ground is perfectly flat and the measurements are exact.
Should I round the order up or down?
Always up: the order is the exact figure rounded up to the next whole cubic yard, because suppliers deliver whole yards and a short load cannot be topped up cheaply. At 13.58 cubic yards exact the order is 14 cubic yards, not 13 — rounding down would leave well over half a yard short.
How do I measure an irregular patio area?
Split it into rectangles and triangles, measure each piece, and add the pieces: a rectangle is length times width, and a triangle is half the base times the height. Measure twice and use the larger figure when the pieces are close — an area guessed small is the most common cause of a short delivery.
Can I use this chart for a different chip stone?
Yes, for any loose stone sold by the cubic yard: the formula is area times the waste factor divided by coverage, and coverage is always 324 divided by depth in inches. Only the stone name changes — the arithmetic is the same for every chip, which is why the same chart shape serves the whole stone family.