Online Engineering Tools
Practical, free calculators for civil engineering tasks. Solve structural, hydraulic, and material problems instantly in your browser. No signup required.
All Engineering Tools
Each tool is built on established engineering formulas with unit conversion and visualization.
Asphalt Calculator: Tonnage, Cost & Quantity
Compute asphalt tonnage, volume, quantity and total project cost for any paving job. Covers driveways, parking lots, roads and footpaths. Supports hot mix asphalt, cold mix, dense-graded, SMA and millings with accurate 2026 pricing data.
Free Gale's Table Generator for Major Closed Traverse
This Tool Generates a complete Gale's traverse table from bearings and distances. Calculates latitudes, departures, closing errors, Bowditch (compass rule) and Transit corrections, adjusted coordinates, adjusted bearings and lengths. Includes full step-by-step workings.
Free AI Moment of Inertia Calculator - All Shapes and Geometry
Calculate area moment of inertia (second moment of area) and mass moment of inertia for all standard shapes. Live annotated diagrams update as you type. Full step-by-step solutions, parallel axis theorem, and all unit systems.
Chi-Square Goodness of Fit Calculator
Calculate the Chi-Square goodness-of-fit to determine if hydrological data (like flood peaks) fits Gumbel or Log-Pearson III distributions.
Water Budget, Management & Conservation Calculator
Calculate water budgets and explore conservation techniques, hydrological cycles, and floodplain management with our advanced tool.
Sieve Analysis Report Generator
Generate a professional sieve analysis report from input data with automatic graph plotting and summaries.
Learn the Theory
Understand the engineering principles behind each calculator.
3-Point Bending Test Equations
The 3-point bending test (also written as three-point bend test or flexure test) is a standardised mechanical test that measures the flexural properties of a material by loading a beam specimen at its midpoint while it rests on two supports
Hollomon Equation: Strain Hardening Power Law - Formula, Parameters, Worked Examples & K–n Table
he complete reference for the Hollomon power law : derivation, physical meaning of K and n, true-vs-engineering stress-strain conversion, worked examples for annealed copper and structural steel, comprehensive K and n table for 20+
Bell Curve: Definition, Formula, Properties, Examples & Applications
A complete reference covering the normal distribution formula, the 68-95-99.7 empirical rule, Z-scores and probability tables, skewness, kurtosis, real-world examples across engineering, biology, finance, and education - plus an interactive calculator.
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