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PRESCRIBED ITEM COUNTS

Ribbed slab volume — ribs running along width scenarios.

How does changing ribs running along width affect ribbed slab volume when the other inputs stay fixed?

What this decision changes

This supplied count describes physical items or prescribed positions. Repeated items can contribute to one pooled order only on the same compatible material basis. Method basis: Uses straight full-length, non-overlapping ribs in each direction. Counts and sections are taken from your design; the tool does not determine or validate a ribbed slab system.

The focus is ribs running along width. All other shared inputs remain fixed for each evaluated range.

V = LWT + d(Nx bx L + Ny by W − Nx Ny bx by)Specified Ribbed Slab Volume Calculator

Evaluate your supplied alternatives

Start with your measured plan and selected product data. The initial values and range are illustrative. Each scenario changes only ribs running along width; the other entered values stay fixed.

Display units

Measured plan and product inputs

Slab length

m

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Slab width

m

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Continuous top thickness

mm

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Ribs running along length

Ribs running along width

Width of lengthwise ribs

mm

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Width of cross ribs

mm

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Rib depth below top layer

mm

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Purchase allowance

%

Shortcuts only; choose your own allowance above.

Where to get this value

Enter your own allowance. Presets are input shortcuts, not a construction recommendation.

Supplied comparison range for ribs running along width

Lower supplied comparison value

Upper supplied comparison value

Nine evenly spaced values are evaluated. Whole counts are rounded to distinct integer scenarios. Values between the listed samples are not calculated.

4 evaluated scenarios

Baseline: Concrete order volume — 1.992 m³. Rejected combinations remain visible below.

Quantity to plot

Each bar is one actual calculated concrete order volume. Horizontal values: ribs running along width in the supplied count basis.

Ribs running along width	Concrete order volume	Change from baseline	Use this scenario
1	1.836 m³	-0.156 m³	Open in calculator Exact quantity breakdown Continuous top layer 1.2 m³ Ribs before intersection deduction 0.66 m³ Rib intersections deducted 0.024 m³
2	1.992 m³	0 m³	Open in calculator Exact quantity breakdown Continuous top layer 1.2 m³ Ribs before intersection deduction 0.84 m³ Rib intersections deducted 0.048 m³
3	2.148 m³	0.156 m³	Open in calculator Exact quantity breakdown Continuous top layer 1.2 m³ Ribs before intersection deduction 1.02 m³ Rib intersections deducted 0.072 m³
4	2.304 m³	0.312 m³	Open in calculator Exact quantity breakdown Continuous top layer 1.2 m³ Ribs before intersection deduction 1.2 m³ Rib intersections deducted 0.096 m³

Read the evaluated results

Compare the selected count with the total quantity and whole purchase lines. Boundary positions, kits and package rounding can make the order change in steps.

Replace every illustrative baseline measurement and selected product value with the inputs for your actual task.
Enter a comparison range on the focused input's stated unit and quantity basis.
Review rejected combinations and use the exact detail lines to distinguish measured demand from whole purchases.
Open an evaluated scenario in the full calculator to save its original inputs and quantity breakdown to a browser material project.

Keep the comparison within scope

The count and fixing or component schedule are inputs; capacity, performance and safe attachment are not determined.

Uses straight full-length, non-overlapping ribs in each direction. Counts and sections are taken from your design; the tool does not determine or validate a ribbed slab system.

Dimensions, quantities, prices, timing and product properties are supplied by you. This tool does not select construction specifications or assess structural, electrical or hydraulic suitability.

Only the listed samples are evaluated. Intermediate values, alternate constraints and global cutting optimality are not inferred from the graph.

Continue with this quantity method

Specified Ribbed Slab Volume Calculator

Other independent input decisions

Read the measurement and purchase guides

Deduct intersections in a supplied concrete rib grid

Quantity method and illustrative scenarios checked 6 October 2026. Methods and scope.