Terms

Estimates, not designs

These calculators produce material quantity estimates for planning and ordering. They are not structural or engineering advice, and they do not account for building codes, soil conditions, frost depth, loads, drainage or reinforcement.

Check before you order

Material weights, bag yields and coverage rates vary by supplier, moisture and product. The figures used here are published industry values, listed on the how we calculate page. Confirm quantities with your supplier or contractor before placing an order or pouring concrete.

No warranty

The site is provided as is, without warranty of any kind. To the extent permitted by law, we accept no liability for loss or damage arising from the use of these calculators, including over-ordering, under-ordering or work carried out on the basis of a result.

Content

The text, layout and code of this site are our own work. Physical constants and conversion factors are facts and are free for anyone to use.