(800) 748-5647
(800) 748-5647
Enter your slope dimensions and we'll tell you how many SlopeGrid panels and rebar J-hooks your project needs. For slopes under 45°.
Each panel expands to 8' × 29' = 232 sq ft of coverage and uses 24 J-hooks (3 columns × 8).
| SlopeGrid panels | 0 panels |
| J-Hooks (Rebar #4, 24") | 0 hooks |
Free shipping on all SlopeGrid orders. Add these quantities to your cart on the product pages.
Measure the actual slope face (the sloped surface), not the flat footprint, for the most accurate count.
Panels are sold whole, so counts are rounded up. J-hook count follows the recommended 24-per-panel placement pattern.
This calculator sizes a full geocell slope job from a single set of measurements. Enter your slope width and face length — or a total surface area — and it returns the number of SlopeGrid panels and rebar J-hook anchors you need, plus the square footage those panels cover.
Each SlopeGrid panel expands to 8' × 29' (232 sq ft) of coverage and follows a recommended placement of 24 J-hooks per panel (three columns of eight). Because panels ship and install as whole units, counts round up to the next full panel so nothing comes up short on site.
Geocell covers the sloped surface, not the flat footprint you would see from above. Measuring the ground plan instead of the slope face is the most common reason a first order comes up short. Take three measurements and let the calculator handle the rest.
Measure straight across the face of the slope, side to side, at its widest point. This is the horizontal run the panels will span.
Measure down the slope surface itself — from the top crest to the toe — following the incline, not the flat distance at the base.
Add a 5–10% overlap allowance for trimming around curves, anchoring points, and seams. The calculator applies this before rounding to whole panels.
Cell depth is driven by how steep the slope is and how heavy the fill will be. Deeper cells confine more material and hold better against gravity and water on aggressive grades. Use this as a starting point, then confirm against your fill type and site conditions.
| Cell Depth | Typical Grade | Best For | Fill |
|---|---|---|---|
| 4" (SLP-4) | Up to ~1:2 (26°) | Residential & light commercial slopes, vegetated finishes, swales | Topsoil & seed, or light aggregate |
| 6" (SLP-6) | ~1:2 to 1:1 (26–45°) | Steeper embankments, heavier hydraulic loads, hard-armor faces | Aggregate, stone, or concrete infill |
Slopes steeper than 45° (roughly a 1:1 grade) need a tailored anchoring and reinforcement plan rather than a standard geocell-over-fill install. For those, request a custom quote and we'll help spec the right system.
Once the calculator gives you a panel count, order the matching depth below. Both grids are built from virgin HDPE for a decades-long service life, and every SlopeGrid order ships free.
The everyday profile for residential and light commercial slopes. Fill with topsoil and seed for a vegetated finish, or with stone for hard-armor protection.
View 4" SlopeGrid
Deeper confinement for steeper grades and heavier fill. The choice when the calculator points you toward aggregate or concrete infill on aggressive slopes.
View 6" SlopeGridOne SlopeGrid panel expands to 8' × 29', covering 232 square feet. To estimate panels by hand, divide your total slope-face area by 232 and round up. The calculator does this automatically and adds your overlap allowance first.
The recommended placement is 24 rebar J-hooks per panel — three columns of eight. On steeper grades or loose soils you may increase anchor density; the calculator uses the standard 24-per-panel pattern as a reliable baseline.
Always the slope face — the actual sloped surface the geocell will lie against. Measuring the flat footprint from above under-counts coverage on any real incline, which is the most frequent cause of a short order.
Topsoil and seed for a natural vegetated slope, or gravel, stone, or concrete for hard-armor channel and shoreline protection. Deeper 6" cells hold heavier aggregate and concrete fills better on steep faces.
Panels are rated for grades under 45°. Steeper slopes need a custom anchoring and reinforcement plan that accounts for soil type, water flow, and slope height. Request a custom quote and we'll help spec it — call (800) 748-5647.
Yes. Free shipping applies to every SlopeGrid order. Add the panel and J-hook quantities from the calculator to your cart on the product pages and shipping is included.
Pricing for most jobs is listed right on the product pages. For high-volume orders or slopes over 45°, request a quote and we'll size the full system with you.