About Materials
Materials is a collection of free practical calculators from Designs24hr. The goal is straightforward: enter real project dimensions, see the quantity, understand the assumptions, and make a clearer shopping list.
Designed around real tasks
Each tool handles a distinct problem—concrete volume, concrete bags, slab volume, cubic yards, soil coverage, driveway gravel or weight-to-volume conversion. Related tasks stay together so you can find the right calculation without jumping between near-identical pages.
Local-first
The calculators run in your browser. Your optional project list is stored locally in that browser, without registration.
Transparent estimates
Manufacturer-specific figures are labeled, editable assumptions stay visible, and source references are published on the accuracy page.