Calculate cubic yards or bags of concrete for slabs, footings, columns, and walls.
Concrete Calculator turns the dimensions of a slab, footing, column, or wall into a concrete volume and, where requested, an estimated count of premixed-concrete bags. Choose the matching shape, enter its dimensions and units, and read the result in cubic yards or bags. A slab or wall thickness measured in inches must not be entered as the same number of feet. Because thickness is multiplied directly into volume, that unit mistake can enlarge the estimate by a factor of 12.
For slabs, walls, and rectangular footings, volume is length times width times thickness or depth after dimensions are expressed in compatible units. A circular column uses its circular cross-sectional area times height. When dimensions are in feet, the resulting cubic feet are divided by 27 to obtain cubic yards, since one yard is exactly three feet.
The bag result translates the required volume into the number of packaged concrete-mix bags associated with the displayed bag size or yield. A decimal requirement is not a purchasable quantity, so round up to a whole bag unless the displayed result already does so. This is a material quantity, not an allowance for spillage, overexcavation, or leftover mix.
Do not assume that it does. The base calculation describes the selected shape's geometric volume. If an overage setting is available, choose it deliberately; otherwise account for extra material separately. The suitable allowance depends on form accuracy, excavation, handling, and ordering practice, none of which can be determined from dimensions alone.
No. A concrete-mix bag and a bag of portland cement are not interchangeable quantities. Packaged concrete mix includes cementitious material and aggregate and has a stated mixed yield. Straight cement is only one constituent of concrete. Use the estimate for the concrete-mix bag size represented by the result, then confirm the yield printed on the product.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
Create customizable checklists with groups, due dates, and priorities for any project.
Design a printable daily planner with time blocks, goals, and priority sections.
Measure your typing speed in WPM and accuracy with real-time feedback and stats.
Pomodoro timer with built-in ambient noise (rain, cafe, forest) generated via Web Audio API oscillators.
Stay focused with a customizable Pomodoro timer featuring work and break intervals.
A precise stopwatch with lap tracking, split times, and exportable results.