TheStructuralCalc
9 calculators/ACI 318 · ASCE 7 · BNBC 2020

Calculations you can hand to a checker.

Every result arrives with the equation it came from, the clause that governs it, and a plain list of what the tool did not check. A calculation sheet you can defend — not just an answer.

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Beam Bending Moment & Shear
Simply supported · UDL
12.50 kN/m
6.00 m
Step 1 — Support reactions
=RA = RB = w·L / 2
=12.50 × 6.00 / 2 = 37.50 kN
Step 2 — Maximum moment, at L/2 = 3.00 m
=Mmax = w·L² / 8
=12.50 × 6.00² / 8 = 56.25 kN·m
Load · shear · bending momentschematic, not to scale
w = 12.50 kN/mL = 6.00 mV+37.50 kN−37.50 kNMMmax = 56.25 kN·m
This tool does not check
  • Lateral-torsional buckling of the compression flange
  • Web crippling or bearing at the supports
  • Vibration, or serviceability beyond the deflection limit
Open these numbers in the full calculator

Beam Bending Moment is verified by an independent numerical re-solution of its governing equation, across all thirteen load cases.

9
calculators on one engine
4
disciplines, beams to piles
3
ACI 318 · ASCE 7 · BNBC 2020
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Why engineers use it

Three properties, held without exception.

Traceable01

Each step shows the symbolic equation, the same equation with your numbers substituted, and the result. A citation that is not in the clause registry fails the build, so a fabricated reference cannot ship.

Instant02

The engine runs in your browser, so results and diagrams update as you type — exactly like the sheet above. No round-trip, no spinner, and the inputs live in the URL, so a link reproduces the calculation.

Honest03

Every calculator lists what it does not check, permanently and without a dismiss button. Silence about a missing check reads as “checked and passed”, and that is how people get hurt.

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The catalogue

9 calculators, one engine.

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Structural Analysis

01
Beam Bending Moment, Shear and Deflection CalculatorReactions, shear and bending moment diagrams and elastic deflection for a single-span beam, across thirteen standard load cases — simply supported, cantilever, fixed at both ends and propped cantilever.

Reinforced Concrete

04
Concrete Beam Deflection CheckerImmediate and long-term deflection of a simply supported reinforced concrete beam, using the cracked effective stiffness, checked against the limit for the member category you choose.ACI 318-08RC Beam Detailing from ETABS — Bars, Cutoffs and SMRF/IMRF Hoops, Drawn and Checked to ACI 318Reads a continuous beam's design straight from ETABS through the bridge — every span's required steel, the columns at its supports, Vg and Pu — and details it: continuous and extra bars with their cutoffs, SMRF or IMRF hoops, the capacity-design shear and the full compliance checklist, drawn as a long section with sections, ready for DXF.ACI 318-08ACI 318-19Column Schedule from ETABS — Bars, Ties and Hoops for Every Column, Drawn and Exported to DXFReads every column's required steel from ETABS — live or from the Concrete Column Design Summary — groups the stories as you draw them on a long section, picks the bars and the IMRF or SMRF ties for rectangular, L and T columns, and draws the reinforcement schedule, ready to export to DXF or print as a rebar table.ACI 318-08Punching Shear Check with Column Moment — Two-Way Shear, Moment Transfer and the Depth RequiredChecks punching at a column of a flat slab, footing or mat with the column's P, M2 and M3 — interior, edge or corner — and finds the effective depth it needs. Reads the column's size, materials and every combination's forces from ETABS, and draws the shear stress around the critical section in 3D.ACI 318-19ACI 318-08

Foundations & Geotechnical

02
Isolated Column Footing DesignBiaxial soil pressure with lift-off, overturning and sliding, one-way shear, punching shear with moment transfer about both axes on an edge-aware perimeter, flexure with the short-direction band, anchorage, and the column's bearing on the footing — for a single rectangular spread footing, by ACI 318-08 or ACI 318-19. Designs for your own load cases, combined by BNBC 2020, ASCE 7-05 or ASCE 7-16 (wind, orthogonal earthquake), for ETABS combinations, or both.ACI 318-08ACI 318-19BNBC 2020ASCE 7-05ASCE 7-16Pile Cap DesignRigid-cap pile reactions for every ETABS combination, punching at every pile (CRSI corner and paired piles) and pedestal (wall and core shapes too), one-way shear, flexure with bar selection, bar development and hooks, top steel between columns and design strips, for a 1-8 column cap by ACI 318-08 or 318-19; CRSI's deep-cap checks at the column face and one-way shear at corner piles as options.ACI 318-08ACI 318-19

Materials & Quantities

02
Concrete Test Cylinder CalculatorHow many strength test sets and cylinders a pour requires, and whether the results that came back satisfy the acceptance criteria.ACI 318-08BNBC 2020Concrete Volume CalculatorConcrete quantity for slabs, footings, beams and rectangular or circular columns, with a waste allowance and a bag count for small pours.

More are being migrated onto the engine one at a time. Each arrives with its own verification record rather than in a batch, because a calculator without a check against its sources is not finished.

Verification record

Every calculator states its own verification status, in the open.

Read the verification record
Source
A published worked example from the governing code manual, or an independent re-solution of the same equations.
Clauses
Every citation resolves against the clause registry; an unknown reference fails the build.
Status
Every calculator is listed on the record as verified or unverified — a missing check is never left unsaid.
Scope
What the calculator does not check is stated on the sheet, permanently.

Questions

Is it really free?

Yes. Every calculator and every calculation sheet is free, with or without an account. There is no card to enter and no trial that runs out.

Do I need an account to calculate?

No. The arithmetic never sits behind a sign-up. Accounts are for keeping your work: save any calculation into a project for its job, and reopen it later exactly as you left it — an imported ETABS model included.

Can I hand the sheet to a checker?

That is what it is for. Each step shows the symbolic equation, the same equation with your numbers substituted, and the result, alongside the clause that governs it.

What codes are covered?

ACI 318, ASCE 7, BNBC 2020 — editions vary by calculator. Each one names its own code basis and edition on its own page.

Can the results be used for construction?

No. Results are for preliminary sizing and educational use, and must be reviewed, verified and sealed by a licensed or registered engineer before being used in construction.

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