Terms of use

Effective November 14, 2026. These free calculators are provided for general planning and educational use.

Estimates, not specifications

Results depend on measurements, allowance assumptions, product yields, densities and prices entered by the user. They are not guaranteed order quantities, professional building plans or engineering advice.

Before ordering or building

Verify project dimensions, supplier density, bag yield, delivery minimums and local code requirements. Use qualified advice for safety-critical, load-bearing or regulated work.

Availability

We may update content or calculations as errors are identified. No availability, accuracy or uninterrupted-service warranty is made to the extent permitted by applicable law.

Ownership

Original site content and software are associated with Designs24hr. Third-party manufacturer names and trademarks remain their respective owners' property.