All Free Engineering Tools
Browser-based calculators and utilities for civil, structural, and plumbing engineers — no signup, no install.
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Structural Analysis
Beam Deflection Calculator (Simply Supported, Uniform Load)
Free beam deflection calculator. Enter span, load, modulus, and moment of inertia to compute maximum deflection (5wL⁴/384EI) and bending moment (wL²/8) for a simply-supported beam.
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Concrete Design
Minimum Beam Depth Calculator (ACI 318-19 Table 9.3.1.1)
Free calculator for the minimum depth of nonprestressed reinforced concrete beams per ACI 318-19 Table 9.3.1.1. Covers simply supported, one-end continuous, both-ends continuous, and cantilever conditions.
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Reinforcement
Reinforcement Quantity Calculator (Bars, Stirrups, Walls)
Estimate rebar quantities for beams, columns, and walls. Calculates total length, unit weight (kg/m), and total weight by bar diameter for longitudinal and shear reinforcement.
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Surveying
Lot Plotter — Bearings, Distances, and Area Calculator
Free online lot plotter for surveyors and engineers. Enter bearings (DMS or decimal) and distances; the tool plots the lot, computes area by the surveyor's formula, and exports.
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Structural Analysis
Simple Beam Calculator (Multiple Loads + Diagrams)
Online structural calculator for simply-supported beams under any combination of point loads, uniformly distributed loads, and uniformly varying loads. Generates load, shear, moment, and deflection diagrams.
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Concrete Design
RC Beam Design Calculator (ACI 318-19M Flexure)
Design singly or doubly reinforced concrete beams per ACI 318-19M. Computes required A_s, ɸM_n, neutral axis depth c, strain in tension steel ε_t, and tension-controlled / compression-controlled section status.
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Concrete Design
Rebar Development Length Calculator (ACI 318-19M §25.4)
Compute development length ℓ_d for deformed bars in tension and compression per ACI 318-19M §25.4. Includes modification factors ψ_t, ψ_e, ψ_s, ψ_g, λ.
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Concrete Design
Crack Width Calculator (Gergely-Lutz, ACI 318-19M)
Online calculator for the maximum surface crack width in reinforced concrete using the Gergely-Lutz formula. Useful for serviceability checks in beams and walls.
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Utility
QR Code Generator — Free, Browser-Based, No Tracking
Generate QR codes for URLs, vCards, Wi-Fi credentials, and plain text. Everything runs in your browser — no server upload, no telemetry, no expiring links.
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Utility
PDF Splitter — Split PDFs by Pages or File Size, Free, Browser-Based
Split a large PDF into smaller files by page range or maximum file size. Runs entirely in your browser — your file never leaves your computer.
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Concrete Design
Reinforced Concrete Beam Section Designer (ACI 318M-11)
Design singly or doubly reinforced concrete beams with full section drawing, strain compatibility check, and code-compliant ɸM_n output per ACI 318M-11.
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Reinforcement
Rebar Hook Length Calculator — ACI 318-19 §25.3
Calculate standard 90°, 135°, and 180° rebar hook lengths and seismic hook lengths per ACI 318-19 §25.3.
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Productivity
Free Online Resume Builder — Multiple Templates, PDF Export
Build a clean, ATS-friendly resume in your browser. Multiple templates, live preview, instant PDF export. No signup, no watermark.
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Education
Civil/Structural Engineering Board Exam Reviewer
Free practice questions for the PRC Civil Engineer board exam: math, hydraulics, structural, transportation. Instant feedback and explanations.