Geocell Gravity Retaining Wall Infill Volume Calculator

SettingsSettings for this calculationUS

Market

Imperial · sales tax

Wall Face Area

The total face area of the geocell wall (height × length).

Measure the visible face of the wall being built — its total height times its total run length.

Wall Thickness (Front to Back)

How deep the wall is from its face back into the slope — the dimension that gives it its mass.

This is the term that was missing, and it is the one that makes a gravity wall a gravity wall: the structure stands up because it is heavy, so the infill is the whole cross-section. Geocell gravity walls are commonly designed at roughly half to three-quarters of the wall height in base thickness, so 1.2 m for a 2 m wall is an ordinary starting figure — but take it off the design, because thickness is what the stability check actually sizes. Where the wall is battered or stepped back, the thickness varies up its height: enter the AVERAGE thickness, or work each course separately on its own face area and thickness.

Geocell Layer Depth

The depth (front-to-back dimension) of the geocell cells, which sets how thick the infill layer is.

This is the expanded cell depth of the geocell product, typically 75mm to 300mm, not the wall's overall thickness including any facing.

Geocell infill volume needed

63.7 yd³

High confidence

Geocell panel area across all courses: 3,440 sq ft
Infill in a single geocell course: 7.96 yd³

Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

Infill volume = wall face area × the wall's front-to-back thickness. A geocell gravity wall resists overturning by its own mass, so the infill is the whole cross-section of the wall, not one course of it
Geocell panel area to buy = infill volume ÷ expanded cell depth: the panels lie flat in horizontal courses, so each course covers thickness × length in plan and the courses repeat every cell depth up the wall

Inputs used

Wall Face Area: 430 sq ft
Wall Thickness (Front to Back): 4 ft
Geocell Layer Depth: 0.5 ft

Intermediate steps

Geocell panel area across all courses: 3,440 sq ft
Infill in a single geocell course: 7.96 yd³

Final result63.7 yd³

What this calculation does not cover

A GRAVITY WALL'S THICKNESS IS WHAT THE STABILITY CHECK SIZES, and this page takes it as given rather than deriving it. Thickness comes out of sliding, overturning and bearing checks against the retained height, the backfill's friction angle and any surcharge — run retaining-wall-stability first and bring its thickness here, rather than the other way round.
Face area times one thickness is a prism. Battered and stepped walls are not prisms, so enter the average thickness or work each course on its own face area — the error runs in the unsafe direction if you enter the base thickness for a wall that steps back.
This is the compacted in-place volume of the infill. Granular fill bulks on delivery and loses volume again under compaction, so order against the supplier's loose density and the specified compaction rather than against this figure directly.
Nothing here covers the facing, the geogrid, the drainage aggregate behind the wall or the base preparation beneath it. Those are separate quantities and, in the case of the drainage layer, one that gets left out of geocell take-offs particularly often because the infill is granular too.

Estimated cost — your price

Price per yd³ ($)

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Sources checked 2026-09-06 · in the site-wide review of 2026-09-06 · v1.1.0

Regulatory standards & verification citations2

Infill volume = wall face area × the wall's front-to-back thickness. A geocell gravity wall resists overturning by its own mass, so the infill is the whole cross-section of the wall, not one course of it
Geocell panel area to buy = infill volume ÷ expanded cell depth: the panels lie flat in horizontal courses, so each course covers thickness × length in plan and the courses repeat every cell depth up the wall

Cite this page

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Now that you have the number

These guides cover the work this quantity is for — the first ones run this calculator inside the section that raises the question.

Building a Gabion Walluses this calculator

A gabion is a container, not a structure. The trade sits in mesh aperture, in the fill's placed bulk density, and in what the bottom course beds on.

Building a Retaining Wall

How to calculate geocell gravity retaining wall infill volume in 4 steps

Wall Face AreaThe total face area of the geocell wall (height × length).

Wall Thickness (Front to Back)How deep the wall is from its face back into the slope — the dimension that gives it its mass.

Geocell Layer DepthThe depth (front-to-back dimension) of the geocell cells, which sets how thick the infill layer is.

Geocell infill volume neededThe tool computes the geocell infill volume needed from those figures and shows the formula, its sources, and a confidence rating alongside it.

Wall Face Area	Geocell infill volume needed (yd³)
200 sq ft	29.2
300 sq ft	43.7
400 sq ft	58.3
500 sq ft	72.9
600 sq ft	87.5
700 sq ft	102
800 sq ft	117

Wall Face Area

Geocell infill volume needed (yd³)

200 sq ft

29.2

300 sq ft

43.7

400 sq ft

58.3

500 sq ft

72.9

600 sq ft

87.5

700 sq ft

102

800 sq ft

117

Frequently asked questions

Do I order to the cell depth, or more than that?

More, and the extra is specification rather than waste. Infill is spread proud of the cells and compacted down into them, because a cell filled level with its walls has no surcharge above it — nothing holds the aggregate in place at the surface and the first wheel that crosses it pushes a rut along the cell lines. Manufacturers commonly call for the fill to stand proud before compaction and to finish at or slightly above the wall tops. Two smaller effects run the other way and roughly offset each other on most jobs: the cell walls themselves occupy a little of the volume the plan area suggests, and a slope holds slightly less than its plan footprint implies once the cells are stretched open. Order to the proud figure, not the nominal depth.

Why is infill volume face area times wall thickness, and not times cell depth?

Because a gravity wall is solid all the way through and works by being so. Face area times CELL depth is the infill in one horizontal course — the right answer for a geocell mattress or a single-layer slope facing, and about an eighth of the answer for a 1.2 m thick wall. The cell depth still matters, but for the geocell itself rather than the fill: panels lie flat in courses that repeat every cell depth up the wall, which is what the panel-area row in the breakdown counts. Old note, kept because the geometry in it is right: a geocell gravity wall is built up as a stack of cellular layers, each filled with granular aggregate to the same depth. Since the cell depth is uniform across the wall, the total infill volume is simply the wall's face area multiplied by that depth.

Does this include the facing material or geogrid reinforcement?

No — this calculates only the granular aggregate infill volume within the geocell cells themselves. Any separate facing panels, geogrid reinforcement layers, or drainage backfill behind the wall should be estimated separately.

What cell depth should I use if my wall has multiple geocell products?

Each product's own expanded depth, worked zone by zone: where the depth varies by course, run each zone through the page on its own face area and cell depth, then sum the results. The cell depth sets the geocell panel area here, not the infill, which is the face area times the wall's thickness whatever the cells.