Slab and screed volume calculator.
Calculate concrete slab and screed volume together for your floor areas. Enter the plan area, slab thickness and screed thickness for each row, & this screed calculator will find the slab volume, screed volume and combined total for every area. Slab and screed are usually different materials placed at different stages, so they're kept as two separate layers rather than one combined pour. Enter a screed thickness of zero if an area has no separate screed. Use our Concrete Volume Calculator for pours that aren't a combined slab-and-screed floor buildup.
Drop an Excel or CSV file or to replace the table below.
Column A: area name. Column B: plan area. Columns C and D (optional): slab and screed thickness — rows without a screed thickness are treated as slab-only.
Parsed entirely in your browser — your file is never uploaded to our servers.
| Area | Plan area (m²) | Slab thickness (mm) | Screed thickness (mm) | Slab volume (m³) | Screed volume (m³) | Row actions |
|---|---|---|---|---|---|---|
| — | — | |||||
| — | — | |||||
| — | — |
How we calculate this.
Calculate concrete slab and screed volume together for your floor areas. Enter the plan area, slab thickness and screed thickness for each row, & this screed calculator will find the slab volume, screed volume and combined total for every area. Slab and screed are usually different materials placed at different stages, so they're kept as two separate layers rather than one combined pour. Enter a screed thickness of zero if an area has no separate screed. Use our Concrete Volume Calculator for pours that aren't a combined slab-and-screed floor buildup.
For each area (row): slab volume = plan area × slab thickness and screed volume = plan area × screed thickness, both converted from millimetres to metres. The combined total is slab volume plus screed volume, summed across every row.
| Assumption | Value | Source |
|---|---|---|
| Volume method | area × thickness, calculated separately for slab and screed | Straightforward geometric takeoff — no bulking, shrinkage or compaction adjustment applied to either layer. |
This is an early-appraisal planning estimate, not a quotation or a substitute for a surveyed takeoff. Last reviewed 5 Aug 2026.
They're usually different materials placed at different stages — a structural concrete slab, then a separate screed layer on top to bring the floor to its finished level — so ordering each one separately is more useful than one combined figure.
Enter a screed thickness of zero for that row — its screed volume will show as zero and it won't affect the screed total.
It depends on the screed type and what's underneath (e.g. underfloor heating pipes need more cover) — typical bonded or unbonded sand-cement screeds are commonly in the 40–75 mm range, but always confirm against your project specification.
No — these are poured (bank-measure) volumes for both layers, not loose or compacted volumes. Use the Soil Bulking & Swell Factor calculator if you need to convert earthworks volumes instead.
Yes — click or drop an Excel (.xlsx/.xls) or CSV file onto the upload area. The first column should be an item name and the second the measurement for that row; extra columns this calculator uses are read too if present. The file is parsed entirely in your browser — it's never uploaded to our servers. Download the blank template first if you're not sure of the layout.
Yes — use the metric/imperial switch above the calculator. Values you've already entered convert automatically; nothing is lost switching back and forth.
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