Concrete volume calculator.
Calculate concrete volume for your slabs, footings or pads. Enter the length, width and depth for each pour, & this concrete calculator will find the poured volume plus the total across every row, with your waste allowance added on top. This is bank-measure volume — the true geometric volume before spillage, over-excavation or formwork tolerance — since concrete is ordered and paid for by the delivered cubic metre. This calculator is a geometric takeoff, not a substitute for a structural design. Use our Concrete Mix Ratio Calculator for a cement, sand and aggregate breakdown.
Drop an Excel or CSV file or to replace the table below.
Column A: pour name. Columns B, C and D: length, width and depth for that pour.
Parsed entirely in your browser — your file is never uploaded to our servers.
| Pour | Length (m) | Width (m) | Depth (mm) | Volume (m³) | Row actions |
|---|---|---|---|---|---|
| — | |||||
| — | |||||
| — |
How we calculate this.
Calculate concrete volume for your slabs, footings or pads. Enter the length, width and depth for each pour, & this concrete calculator will find the poured volume plus the total across every row, with your waste allowance added on top. This is bank-measure volume — the true geometric volume before spillage, over-excavation or formwork tolerance — since concrete is ordered and paid for by the delivered cubic metre. This calculator is a geometric takeoff, not a substitute for a structural design. Use our Concrete Mix Ratio Calculator for a cement, sand and aggregate breakdown.
For each pour (row): volume = length × width × depth. The total across every row is summed, then a shared waste allowance is added on top for the ordering total — total incl. waste = total × (1 + waste allowance). Depth is entered in millimetres since pour depths are usually specified that way; length and width in metres.
| Assumption | Value | Source |
|---|---|---|
| Waste allowance | 5–10%, default 5% | Typical contractor allowance for spillage, over-excavation and formwork tolerance on a straightforward pour — general concrete-estimating practice. Increase it for irregular ground or hand-placed pours. |
This is an early-appraisal planning estimate, not a quotation or a substitute for a surveyed takeoff. Last reviewed 5 Aug 2026.
Concrete is ordered and paid for by the delivered cubic metre, and a pour rarely uses exactly the geometric volume — spillage, over-excavation and formwork tolerance all add a bit more. Ordering to the raw geometric total risks a delivery falling short part-way through a pour.
5% is a reasonable default for a straightforward, well-formed pour on firm ground; go higher (up to around 10%) for irregular ground, hand-placed work, or a first pour with an unfamiliar crew.
Yes — each row is an independent pour with its own length, width and depth. Add rows for every pour on the job, or upload a spreadsheet listing them all; the totals sum every row.
No. This is a geometric quantity takeoff for ordering concrete, not a structural design — slab thickness, reinforcement and mix strength all need a qualified engineer's sign-off.
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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