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Construction Calculators

Concrete Bags Calculator

Verified formula Updated Jun 2026 Private — runs on your device

Enter details
m³
m³
Verified formula Private

Bags needed

59

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Concrete Bags Calculator

The Concrete Bags Calculator works out your bags needed in an instant. Enter concrete volume and yield per bag and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the concrete volume.
  2. Enter the yield per bag.
  3. Read off your bags needed — the calculator updates automatically, with no button to press.

Worked example

For example, with concrete volume of 1 m³ and yield per bag of 0.017 m³, the bags needed is 59.

Inputs used
Concrete volume 1 m³
Yield per bag 0.017 m³
Results
Bags needed 59

Results are estimates for educational use, not professional advice.

Key terms explained

Volume
The amount of three-dimensional space an object occupies, measured in cubic units.

Frequently asked questions

Divide the volume by the yield per bag and round up. For 1 m³ with bags yielding 0.017 m³, you need 59 bags.

It depends on bag size. A 40 kg bag yields roughly 0.017 m³; check your product for the exact figure.

Yes. Add a little for spillage and uneven sub-base, so you do not run short mid-pour.

For small jobs like posts and footings. For large pours, ready-mix is usually cheaper and faster.

Enter the concrete volume. Enter the yield per bag. Read off your bags needed — the calculator updates automatically, with no button to press.

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