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Structural Engineering Calculator delivers 59
AISC and ACI structural formulas with instant results,
demand/capacity checks, a built-in AISC section database,
and material references — all in one app. Whether you’re
on site, in the office, or reviewing drawings, every
calculation you need is in your pocket.

59 STRUCTURAL FORMULAS

COLUMNS
Critical Ratio (Cc), Effective Length Factor (K),
Slenderness Ratio (KL/r), Allowable Compressive
Stress (Sr less than Cc), Allowable Compressive
Stress (Sr greater than Cc), Safety Factor,
Maximum Axial Load.

BEAMS
Shear Capacity of Flexural Members, Allowable
Bending Stress (Compact and Noncompact), Moment
Gradient Factor (Cb), Allowable Flange Bending
Stress, Plastic Moment (Mp), Lateral Unbraced
Lengths (Lp and Lr), Limiting Buckling Moment (Mr),
Nominal Moment (Mn), Critical Elastic Moment (Mcr),
Allowable Shear Stress, Beam Deflection for UDL
and Point Load.

BASE PLATES
Base Plate Area, Plate Thickness, Bearing Pressure,
Flange and Web Thickness, Plate Dimensions N and B.

COMPOSITE BEAMS
Horizontal Shear for Concrete and Steel, Number of
Shear Connectors, Transformed Section Properties,
Modular Ratio, Elastic Neutral Axis.

CONNECTIONS
Allowable Shear with Tension Field Action, Allowable
Bearing Stress for Rollers and Rockers, Axial Stress
for Concentrated Loads, Allowable Bearing Stress on
Fasteners, Number of Shear Connectors, Total
Horizontal Shear.

AISC CODE REFERENCES
Every formula links directly to AISC/ACI clauses —
AISC 360-16, AISC ASD 9th Edition, ACI 318-19,
and AISC Design Guide 3.

PASS / FAIL CHECK
Instant visual adequacy check with demand/capacity
ratio — green for PASS, red for FAIL.

AISC SECTION PICKER
Browse W-shapes (AISC 15th Edition) and auto-fill
section properties instantly.

REFERENCE TAB
Built-in library with W-sections (W4–W44), ASTM
materials (A36, A992, A572, A500, A325, A490,
F1554), weld electrodes, concrete grades, and codes.

USCS & SI UNITS
Switch anytime between inches/ksi and mm/MPa with
automatic conversion.

All section and material data included. Supports both USCS and SI
units. Compatible with iPhone and iPad. Pay once —
no subscriptions.

References: AISC Steel Construction Manual 15th
Edition, AISC 360-16, AISC ASD 9th Edition,
ACI 318-19, AISC Design Guide 3.