Statistics & MathTool
Bell Curve Generator & Normal Distribution Plotter
Plot normal curves, shade any area, compare distributions and export a high-resolution graph for reports and slides.
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Normal distribution · μ = 0, σ = 1
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The calculators engineers and students open most, each with plots and step-by-step working.
Statistics & MathTool
Z-Score Calculator: Percentile & Normal Distribution
Convert raw scores to z-scores and percentiles with a shaded bell curve and step-by-step working.
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Statistics & MathTool
Inverse Normal Distribution Calculator
Find the x value for any probability: left tail, right tail, central or two-tailed areas.
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StructuralTool
Moment of Inertia Calculator for All Shapes
Area and mass moment of inertia, centroid and section properties for common and built-up shapes.
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StructuralTool
Bending Stress Calculator
Beam bending stress from moment, section modulus and geometry, with the stress distribution plotted.
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Construction & MaterialsTool
Concrete Volume Calculator
Volume of concrete for slabs, columns, beams and footings with wastage allowance.
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Knowledge
All 40 articles
Latest guides & articles
Theory explained from first principles, with worked examples you can check.
ElectromagnetismGuideNew
Maxwell's Equations Explained: All Four Laws, Integral and Differential Forms
Four equations describe every classical electric and magnetic phenomenon, from a compass needle to Wi-Fi to sunlight. This guide states each law in integral and differential form, explains what it means physically with an example,
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ElectromagnetismGuideNew
Faraday's Law and Lenz's Law: Electromagnetic Induction Explained with Interactive Calculators
Every power station, transformer, electric guitar pickup and wireless charger works because a changing magnetic flux induces a voltage. This guide explains magnetic flux, Faraday's law, the direction rule of Lenz's law, motional EMF, the AC generator, transformers, inductance and eddy currents, with worked examples and an animated generator you can control.
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Hydrology & WaterGuideNew
Infiltration Equations: Horton, Philip, Green-Ampt, Ponding Time and the φ-Index
Infiltration decides how much rain becomes runoff. This guide explains the three classic infiltration models, gives the Rawls Green-Ampt parameters for all 11 soil textures, shows how to compute ponding time, and works through the φ-index and W-index.
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Hydrology & WaterGuideNew
FAO-56 Penman-Monteith Reference Evapotranspiration (ET₀): Step-by-Step Calculation with Worked Example
The FAO-56 Penman-Monteith equation is the international standard for reference evapotranspiration. This guide explains every term, walks through all twelve calculation steps, reproduces the official FAO worked example (ET₀ = 3.9 mm/day),
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Hydrology & WaterGuideNew
Thiessen Polygon Method for Average Rainfall:
Rain gauges measure rainfall at points, but floods, water budgets and hydrological models need the average over an area. This guide explains the three classical methods, lets you drag gauges on a live catchment and watch the Thiessen polygons
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Hydrology & WaterGuideNew
Rational Method (Q = CiA): Formula, Runoff Coefficient Tablle
The rational method is the most widely used way to size storm drains, culverts and gutters for small catchments. This guide covers the formula in SI and US units, where each term comes from, how to pick C, how to compute the time of concentration and
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ElectromagnetismToolNew
Magnetic Field Calculator: Straight Wire, Current Loop, Solenoid, Helmholtz Coil and Toroid
Compute the magnetic flux density B produced by steady currents in the six most common conductor shapes, using the Biot–Savart law and Ampère's law. The calculator gives B in tesla, millitesla, microtesla and gauss, plots the field along the axis, maps the exact off-axis field of a loop, compares finite and ideal solenoids, and shows the substituted formula for every result.
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ElectromagnetismToolNew
Electric Field Calculator and Simulator for Point Charges (Coulomb's Law)
Place up to eight point charges, drag them around, and watch the electric field lines and equipotential lines update live. Move the probe to read the electric field vector and potential at any point, see the net Coulomb force on every charge, or use the quick Coulomb's law calculator for two charges in any medium.
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Hydrology & WaterToolNew
SPI Calculator: Standardized Precipitation Index from Monthly Rainfall
Paste a monthly rainfall series and get the SPI at 1 to 24 months using the standard McKee et al. (1993) gamma method, the drought category of every month, a list of drought events with duration and severity, and a multi-scale heatmap that shows how short dry spells grow into long droughts.
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Hydrology & WaterToolNew
Flood Frequency Analysis Calculator (Gumbel, Log-Pearson III, Normal & Log-normal)
Paste annual maximum floods and get the 2- to 1000-year design floods from four distributions side by side, Gumbel confidence limits, a Gumbel probability plot with your data, a goodness-of-fit ranking, the return period of any given flood, and the full step-by-step
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Hydrology & WaterToolNew
SCS Curve Number Runoff Calculator
Estimate direct runoff depth and volume from a storm with the SCS-CN (NRCS curve number) method. Build a composite curve number from the complete TR-55 tables,
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Statistics & MathToolNew
Mann-Kendall Trend Test Calculator with Sen's Slope Estimator
Paste a time series and get the Mann-Kendall S statistic, variance (with tie correction), Z, p-value, Kendall's τ and Sen's slope with its confidence interval. Includes the Hamed-Rao and trend-free pre-whitening corrections for autocorrelated data,
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Engineers Views offers detailed civil engineering tutorials, practical guides on concrete mix design and soil mechanics, insights into AI/ML and Python in engineering, and useful online calculators.
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