Concrete Calculator

Calculate the exact volume and materials needed for any concrete pour — slab, column, or staircase.

Instant result Runs in browser

Mix ratios per m³

C10/B150 — 250 kg + 870 kg + 1100 kg + 175 L
C16/B200 — 300 kg + 820 kg + 1100 kg + 180 L
C20/B250 — 350 kg + 760 kg + 1060 kg + 185 L
C25/B300 — 400 kg + 700 kg + 1020 kg + 190 L
C30/B350 — 450 kg + 650 kg + 970 kg + 195 L
C35/B400 — 500 kg + 600 kg + 920 kg + 200 L

Cement + Sand + Gravel + Water per m³

How to use?

  1. 1
    Choose shapeSelect the shape that matches your construction element.
  2. 2
    Enter dimensionsInput length, width, and height (or diameter for cylinders).
  3. 3
    Read the resultsGet volume and required materials including cement bags.

FAQ

Which concrete grade should I use?
C20/B250 is suitable for most residential slabs and foundations. C25/B300 or higher for structural elements.
Why add a waste factor?
Concrete is lost during mixing, pouring, and spills. A 10% surplus is recommended for most projects.

Concrete Calculator

Our concrete calculator helps you estimate the exact volume and materials needed for your construction project. Choose your element shape, enter dimensions, select the concrete grade, and get instant results including cement, sand, gravel, and water quantities.

Concrete planning depends on volume, thickness, waste allowance and the type of job. A slab, footing, post hole or garden path may use the same cubic measurement, but the practical ordering decision can be different. Uneven ground, formwork gaps, reinforcement, pump loss and small measurement errors can all increase the amount needed. For that reason many users add a modest safety margin after calculating the clean geometric volume.

Concrete strength classes and mix choices should match the project. Small non-structural jobs are different from beams, columns and foundations that carry load. For structural work, local building codes and engineering drawings should always take priority. The calculator is useful for estimating quantity and cost before ordering, comparing bagged concrete with ready-mix delivery, and checking whether your measurements are realistic.

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