Add 10% waste

Always order 5–10% extra concrete to account for spillage, uneven sub-base and screed loss. We include a 10% safety margin in the bag count.

Frequently Asked Questions

Is the Concrete Calculator free to use?

Yes, the Concrete Calculator is 100% free to use. There are no subscriptions, no sign-ups, and no hidden fees.

Is my data safe when using the Concrete Calculator?

Absolutely. All calculations performed by the Concrete Calculator happen locally in your web browser. We do not store, track, or transmit your inputs or results to any server.

How accurate is the Concrete Calculator?

Our Concrete Calculator uses industry-standard formulas and methodology. You can view the exact formula and calculation logic used in the methodology section above to verify the math yourself.

Can I use the Concrete Calculator on my mobile phone?

Yes! The Concrete Calculator is fully responsive and works seamlessly on all devices including smartphones, tablets, and desktop computers.