Calculate concrete for every structural element
12 free calculators for footings, walls, steps, columns, piers, and more — built on ACI 318 formulas and used by contractors, structural engineers, and serious DIYers.
Structural Element Calculators
All 12 calculators in this category — click any card to open the tool.
Volume and bag count for strip, pad, and perimeter footings.
Use CalculatorConcrete volume for round and square columns by diameter and height.
Use CalculatorVolume for poured concrete walls by length, height, and thickness.
Use CalculatorConcrete volume for retaining walls including base footing.
Use CalculatorExact concrete volume for staircases using rise, run, and width.
Use CalculatorVolume for curb and gutter sections by length and cross-section.
Use CalculatorConcrete needed for fence, deck, or sign post holes — round or square.
Use CalculatorCylindrical pier volume for decks, docks, and bridge supports.
Use CalculatorFill volume for cardboard form tubes (sonotubes) by diameter and depth.
Use CalculatorVolume for round slabs, pads, and circular pours by radius and depth.
Use CalculatorConcrete volume for rectangular and T-section beams by span and depth.
Use CalculatorConcrete volume for slab-on-grade, T-shape, and perimeter foundations.
Use CalculatorPick the right calculator for your project
Match your project type to the best structural calculator.
| What are you building? | Best tool to use | Open tool |
|---|---|---|
| Foundation or structural footing | Strip, pad, or perimeter footing volume with bag count | Open |
| Fence, deck, or sign post holes | Post hole calculator — accounts for post volume displacement | Open |
| Retaining or garden wall | Retaining wall calculator — wall volume plus base footing | Open |
| Concrete entry steps or staircase | Steps calculator using rise, run, width, and number of steps | Open |
| Round column, pier, or sonotube | Sonotube or pier calculator — cylindrical volume by diameter and depth | Open |
| Structural beam or lintel | Beam calculator for rectangular and T-section spans | Open |
Related calculator categories
Structural work needs more than just volume — these categories cover the rest.
Built for real structural work
Every calculator uses the same formulas structural engineers rely on — free, no login, no ads.
ACI 318 formulas
Every structural calculation follows ACI 318 — the standard referenced by building inspectors and structural engineers across North America.
Covers every shape
Round, square, rectangular, trapezoidal — structural elements come in all shapes and our calculators handle all of them without extra steps.
Job site ready
Works on any phone or tablet with no app to install. Large touch targets, instant results, and imperial or metric — whichever your project calls for.
For a full structural pour, start with the footing calculator to size your base, then confirm rebar requirements with the rebar calculator, and check your mix strength in the mix design calculator.
Common questions about structural concrete
Straight answers to the questions contractors and engineers ask most.