Concrete Calculator. Measure rectangular, circular and annular concrete groups with depth ranges, counts and voids. Reconcile exact bag yields or ready-mix terms and save source-owned planning records.
A quick decision brief for this specific tool
Named rectangular/circular/annular groups, counts, depth endpoints, voids and exact purchase evidence
Source-owned quantity endpoints, optional real purchase multiples and complete original-unit JSON; no construction-status claims
Separates measured net volume, entered extras and exact supplier/product purchase arithmetic
Choose your path
Measure repeated rectangular, circular and annular forms, reconcile depth/void endpoints and save only owned planning quantities.
Measure actual geometry without inferring a footing design.
Choose shape and count, enter diameters or rectangle dimensions and depth endpoints; inspect each group.
Can reproduce net volume and distinguish additional allowance.
Retain exact product yield, original units and quote terms.
Switch display units, revise the product basis, correct cleared fields and export the record.
No universal bag yield or ready-mix increment is invented.
Save quantities without claiming construction is complete.
Open the intended Project, review source inputs, explicitly save, reload and compare owned fields.
Prior bag counts and construction observations remain unchanged.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
This tool is part of these guided projects. Each project provides step-by-step instructions with checklists and all the tools you need in one place.
Coordinate one residential deck from authority, survey, utilities, code and qualified design through quantity scenarios, controlled construction, inspections and handoff.
Coordinate one fence from authority, survey, utilities, zoning and affected-user evidence through quantity scenarios, controlled installation, inspection and handoff.
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Check directional bar grids, reviewed centerline offsets and complete straight cuts. Reconcile feasible whole-stock packing, trim, cut loss, usable stock and sale packs.
Review an independently proposed rectangular footing under gross service-load cases. Inspect centered or one-axis eccentric contact pressure against a sourced applicable limit.
Reconcile slab concrete and extra thickenings with an independently specified base, usable membrane coverage and reviewed reinforcement stock schedule—without invented material specifications.
Rectangles use length × width; circles use πD²/4; annular forms use π(D²−d²)/4. Circular inputs are diameters. Sum only non-overlapping groups of one compatible mix.
Net group = count × (cross-section × depth − extra void)Depth endpoints express reviewed variation, not confidence intervals. Do not add the same variation again through the allowance. Each original number and unit survives display changes.
Planned endpoints = net endpoints × (1 + additional allowance/100) + reserveUse documented bag yield from the exact product, or enter supplier ready-mix minimum and order increment. Quantity outputs use independent Project keys and never overwrite construction observations or another tool’s bags.
Bags = ceil(volume/yield); sale packs = ceil(max(0, bags−whole stock)/pack size)Updated: August 2026
Illustrative 10×8ft at4in gives26.666667ft³ net; an entered10% allowance gives29.333333ft³. A reviewed0.6ft³ bag yield requires49 whole bags before stock and sale-pack rounding.
Record the measured diameter, depth range and identical count for one group. A different diameter belongs in another group; no deck height or post count is silently used as footing geometry.
Download the complete input/quantity record, then explicitly save its source-owned fields to the intended Deck or Fence Project. Existing observations, checklists and other tool quantities remain separate.
Check the shape labels and deduct only distinct voids; thickened portions must not duplicate a slab volume already counted.
Keep planning quantities separate from construction observations, authority approvals and inspection records.
Build a measured takeoff from up to six non-overlapping pour groups. Keep original units, depth endpoints, voids, extra allowance and supplier evidence traceable. Explicit Project Save records planning quantities only, never poured footings or installation approval.