Online Engineering Tools
Practical calculators and utilities built for engineers, students, and professionals.
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.
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
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,
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,
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.
Latest Blog Posts
Tutorials, guides, and insights on civil engineering, AI, Python, and statistics.
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.
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),
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
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
Hydrograph: Complete Theory, Unit Hydrograph & Derivation
A hydrograph is a graphical representation of the variation of discharge (or stage) of a stream at a given gauging station plotted against time. In hydrology, it is the single most important tool for understanding and quantifying the rainfall-runoff response of a catchment. Every flood estimate, reservoir design, culvert sizing, and floodplain mapping exercise depends either directly on a measured hydrograph or on a model capable of reproducing one.
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
Frequently Asked Questions
What kind of content can I find on Engineers Views?
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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Yes, all tools on Engineers Views are completely free. No account required, no hidden charges.
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Use our Contact page. We build tools and write articles based on community feedback.
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New articles and tools are added regularly. Follow our blog or check back frequently for updates.
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