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Structural & Safety Calculators

Professional site engineering tools for retaining walls, beam spans, and slope stability. Technical checks for fence posts, ADA compliance, and space capacity.

Wall Geometry
Backfill Properties
Wall Resistance
Active Earth Pressure
–
kPa max at base
Horizontal Force on Wall
–
kN/m
Overturning Moment
–
kNm/m
Resisting Moment
–
kNm/m
FoS Overturning
–
(target ≥ 2.0)
FoS Sliding
–
(target ≥ 1.5)
Base Pressure — Toe
–
kPa
Base Pressure — Heel
–
kPa
Stability Status
Drain Provision
Rankine Ka = (1−sin φ)/(1+sin φ). Active pressure diagram: triangular for backfill weight (σh=Ka×γ×z), rectangular for surcharge (σh=Ka×q). Overturning moment about toe. Resisting moment = wall self-weight × arm. FoS overturning ≥2.0, sliding ≥1.5 (BS EN 1997-1). Drainage essential to prevent pore water pressure build-up.
Member Properties
Loading & Service Class
Applied UDL
–
kN/m
Section Modulus Wx
–
cm³
Max Bending Moment
–
kNm
Max Shear Force
–
kN
Bending Stress Actual
–
N/mm²
Permissible Stress (Kmod)
–
N/mm²
Bending Check
–
Actual ≤ Permissible
Deflection
–
mm
Deflection Check (span/300)
Shear Check
Eurocode 5 (BS EN 1995-1): Kmod factors for service class and load duration modify permissible stress. SC2/Med-term: Kmod=0.80. Deflection limit: span/300 (inst.) or span/250 (final). Bending check: σm,d ≤ fm,k × Kmod / γM (γM=1.3 timber). This tool provides indicative results — structural engineer to verify.
Fence Geometry
Wind & Site
10-min mean at 10m height
Post Specification
Horizontal Force per Post
–
kN
Wind Pressure on Panel
–
kPa
Bending Moment at Ground
–
kNm
Required Embedment Depth
–
m
Post Bending Stress
–
N/mm²
Concrete Volume per Post
–
litres
Post Bending Status
Wind pressure q = 0.5 × ρ × V² × Cf × Ce (ρ=1.25 kg/m³ air density, Ce=exposure factor, Cf=force coefficient). Horizontal force per post = q × fence area per post (height × spacing). Embedment depth (propped cantilever in soil): d = √(3×M / (Fb×1.5×L)) where Fb = soil bearing at pile (simplified).
Slope Geometry
Soil Properties
0=dry, 0.50=sat
FoS Bishop Simplified
–
ratio
FoS Infinite Slope
–
ratio
Required Angle for FoS 1.5
–
° (if currently failing)
Stability Status
Infinite slope: FoS = (c + (γ×H×cos²β − ru×γ×H)×tan φ) / (γ×H×sinβ×cosβ). Bishop simplified uses circular failure surface — this tool uses a simplified Bishop iteration. For critical slopes, retain a geotechnical engineer and BS EN 1997-1 / CIRIA C580 guidance.
Compliance Standard
Path Geometry
Leave 0 if not a ramp
10
/ 10 Pass
Compliance Criteria Checklist
CriterionValueStatusStandard Rule
Space Parameters
Maximum Occupancy
–
persons
Occupancy Factor Applied
–
m²/person
Egress Width Required
–
m total clear exit width
Fire Egress ComplianceVerify with fire engineer
Assembly Point RecommendationProvide safe dispersal area
Approved Document B (UK): exit width ≥750mm per exit, one exit per 60 persons below 200 persons. IBC 2021 Table 1004.5: occupant load factors by use. Egress width: UK=8mm per person (stairs), 5.3mm (corridors). Always verify with fire engineer and local fire authority for occupied public spaces.

CalcType: Professional Structural Safety & Compliance Solutions — This comprehensive site engineering suite is engineered to safeguard the structural integrity and public safety of landscape environments for architects, civil engineers, and safety consultants. Our platform integrates high-fidelity modules for retaining wall stability analysis, calculating specific Factors of Safety (FoS) against overturning and sliding, alongside technical beam and joist span verification for decks and pergolas based on bending stress and deflection limits. To manage environmental risks, the tool offers engineering-grade approximations for slope stability and fence post wind loads, factoring in regional wind pressures and drag coefficients. Beyond structural capacity, CalcType provides essential compliance checks for ADA (Americans with Disabilities Act) and AS1428.1 standards, cross-referencing ramp gradients, clear widths, and landing lengths to ensure universal accessibility. Additionally, our space capacity and egress module empowers planners to determine safe occupancy limits and required exit widths in accordance with international life safety codes. Whether you are verifying the stability of a gravity wall or auditing a public plaza for accessibility barriers, our calculators provide the technical rigor required for hazard-free, code-compliant site construction. Technical Disclaimer: The structural calculations and safety data provided by this tool are intended for preliminary estimation and conceptual design purposes only; all final engineering plans, structural specifications, and accessibility audits must be verified by a licensed professional engineer (PE) or certified access consultant prior to construction or permitting. Actual material performance, soil bearing capacities, and site-specific wind conditions may vary significantly from modeled results; therefore, CalcType assumes no liability for structural failures, regulatory non-compliance, or personal injury resulting from the use of these tools.