Structural · Geotechnical · Site engineering

Calculations you can defend to a plan-check engineer.

Every formula, coefficient, and limit is annotated with its source clause. Pick your country's code pack; the engine follows that regulation.

Browse calculators How referencing works
Calculators
87
Country code packs
13
Languages
11
Verified against sources
5×

What makes this different

01 §3.1

Clause references, not hand-waving

Each output line names the exact regulation, version, and clause number that produced it. Print the report; hand it to your reviewer.

02 §3.3

Verified against solved examples

No calculator ships without matching at least two independently published worked examples. Test cases live next to the code.

03 §3.5

Versioned code packs

Regulations change. Your calculation carries the exact code-pack version it was run against, so a re-check three years from now still reproduces.

04 §7

Your inputs stay on your machine

The engine runs in your browser. Project data is never uploaded — no server-side storage, no cloud round-trips.

Calculator categories

Courses

Country-independent physics and design theory, organized as a curriculum — undergraduate through graduate level. These do not depend on a code pack; where a code does apply (RC design, seismic), the tool is clearly labelled.

1

Structural Analysis I & II

Simple beams, cantilevers, Gerber beams, trusses, cross method, Euler buckling, virtual work, slope-deflection, three-moment theorem.

17 pages
 2

Structural Dynamics

SDOF/MDOF vibration, response spectra, Newmark/Duhamel integration, modal analysis.

7 pages
 3

Finite Element Analysis

Direct stiffness method — bar, truss, beam, frame, and CST elements. Element formulation, assembly, boundary conditions, and dynamic FEM.

6 pages
 4

Mechanics of Materials

Normal stress, torsion, bending, cross-section properties, Mohr's circle, pressure vessels, von Mises / Tresca yield criteria.

7 pages
 5

Steel Design — Worked Examples

17 solved ÇYTHYE 2018 / AISC 360 steel examples, cross-checked against guide values (≤1% deviation).

TR16 examples
 6

Earthquake Engineering

TBDY 2018 equivalent lateral force method, load combinations with seismic effects, story drift limits, P-delta, seismic joints — with SAP2000 worked example.

TRactive
 7

Soil Mechanics

Effective stress, consolidation, shear strength, slope stability — sourced course, not yet built.

planned
 8

Foundation Design

Shallow and deep foundations, bearing capacity, pile groups, mat foundations — sourced course, not yet built.

planned
 9

Reinforced Concrete I & II

University-level RC theory beneath any single code pack — strain compatibility, ductility, serviceability. Sourced course, not yet built.

planned
 10

Civil Engineering Design I & II

Capstone-style integrated design studio problems spanning multiple subsystems. Sourced course, not yet built.

planned
 11

MATLAB for Structural Engineers

Scripted stiffness-method and FEM implementations paralleling the Dynamics/FEM section. Sourced course, not yet built.

planned
 12

Construction Management

Scheduling (CPM), cost control, procurement, site organization. Sourced course, not yet built.

planned
 13

ETABS — Applied Training

Dedicated course: theory + step-by-step program instructions (verified menu paths) + easy/medium/hard/very-hard worked examples. Equivalent Lateral Force method fully built; more topics in progress.

TRactive
 14

SAP2000 — Applied Training

Dedicated SAP2000 course matching the ETABS course in depth. Sourced course, not yet built.

planned
 18

ABAQUS — Finite Element Analysis

Method-focused: element formulation, material models, implicit/explicit, mesh convergence. Benchmark problems ready; full course sourced, not yet built.

partial
 19

MATLAB / Python for Structural Engineers

The same benchmark problems solved three independent ways — this site's JS engine, MATLAB, and Python.

active
 15

Source Auditing

How to critically read published engineering content — five red flags, taught through real cases from this project's own history.

active
 16

Structural Health Monitoring

Sampling/aliasing, FFT/PSD, modal parameter extraction — closed-loop verification with synthetic systems.

active
 17

Takeoff

DXF takeoff and earthwork calculations — deterministic geometric measurement, not a black-box estimate, entirely in-browser.

active
 20

Concepts

The ideas connecting dozens of calculators — static determinacy, the stiffness method, elastic vs. plastic design.

active

How the reference system works

Every calculator page has three parts: the input form, the computed result, and a citation panel. The citation panel lists each formula used, with the source regulation, version year, and clause or equation number.

Foreign code standards (ACI, AISC, DIN, BS, GB, JIS) are copyrighted; we cite clause numbers only, never reproduce clause text. Turkish regulations published in the Official Gazette are public domain and may be quoted directly. 

As,min = 0.8 · (fctd/fyd) · bw · d
        TS 500:2000 · §7.3 · Eq. 7.3

Vc    = 0.17 · λ · √f'c · bw · d
        ACI 318-19 · §22.5.5.1 · Eq. 22.5.5.1

Preliminary calculation tool. Results are for preliminary sizing and cross-check only. Final design, sealed responsibility, and permit submissions require the full official text of the referenced regulations and the review of a licensed engineer.