step 1 / choose a discipline

Engineering calculators, organised by topic.

Start with structural, geotechnical, hydraulics, site and construction, or utilities. Each hub then narrows the choice to an analysis type, design material, load case, or code route.

calculator topics

Choose your discipline.

Structural has the deepest route today. The same hub pattern is ready to scale as more civil engineering tools are added.

01 / STRUCTURAL37 tools

Structural engineering

Move from beam and column analysis to preliminary reinforced-concrete design, geometric section properties, and international-code roadmaps.

Loading analysis · Design · Section properties Choose a structural branch 02 / GEOTECHNICAL4 tools

Geotechnical engineering

Screen footing pressure and capacity, Rankine earth pressure, and retaining-wall stability.

Foundations · Earth pressure · Retaining walls Open geotechnical 03 / HYDRAULICS12 tools

Hydraulics & stormwater

Calculate channel and pipe flow, head loss, critical depth, weir flow, hydrostatic thrust, and runoff.

Open channels · Pipes · Stormwater Open hydraulics 04 / SITE5 tools

Site & construction

Estimate concrete, reinforcement, earthwork, and grade geometry for practical site planning.

Quantities · Reinforcement · Setting out Open site tools 05 / UTILITIES1 tool

Engineering utilities

Convert common lengths, areas, forces, and pressures before using them in a calculation.

Unit conversion Open utilities

all calculators / direct access

Jump straight to a calculation.

Every calculator remains directly available for search, bookmarks, and shared links. Results are transparent preliminary checks; verify the governing code and project requirements before design use.

Structural engineering 34

Simply supported beam calculatorUDL, central point load, shear, moment and deflection
Simply supported beam reaction calculatorUDL and an off-centre point load
Simply supported triangular-load calculatorReactions, moment and elastic deflection
Fixed-fixed beam UDL calculatorEnd moments, reactions and midspan deflection
Fixed-fixed beam point-load calculatorCentral point load with full end fixity
Cantilever beam calculatorEnd-load moment and elastic deflection
Cantilever UDL calculatorFull-span uniform load and free-end movement
Cantilever triangular-load calculatorLoad rising toward the free end
Propped cantilever UDL calculatorCompatibility reactions, moments and deflection
Partial UDL zone calculatorOne or two loaded segments anywhere on a simple span
Multiple point-load beam calculatorUp to three equal or unequal loads and positions
Central triangular-load calculatorSymmetric tent-shaped distributed load
Beam end-moment calculatorPrescribed signed end moments with UDL or point load
Fixed beam arbitrary point-load calculatorOff-centre reactions, end moments and load deflection
Cantilever arbitrary point-load calculatorLoad-point and free-end movement
Cantilever combined-load calculatorUDL, point load and free-end moment superposition
Propped cantilever point-load calculatorCompatibility actions for any load position
Overhang beam calculatorMovable supports, full-length UDL and point load
Two-span continuous beam calculatorIndependent full-span UDLs and middle-support moment
Bending stress calculatorElastic stress from moment and section modulus
RC beam flexural capacity calculatorPreliminary, code-neutral moment resistance
RC beam reinforcement calculatorPreliminary, code-neutral tension-steel area
Eurocode 2 RC beam flexure calculatorDeclared first-generation EN 1992-1-1 subset
Eurocode 2 RC beam shear calculatorConcrete resistance, vertical links, and strut limit
Eurocode 3 steel section calculatorDeclared first-generation EN 1993-1-1 subset
Eurocode 3 column buckling calculatorTwo-axis flexural buckling with explicit curves
Hong Kong RC beam flexure calculatorBounded HK Concrete Code section check
Hong Kong RC beam shear calculatorConcrete stress, vertical links, and spacing
Hong Kong steel section calculatorBounded low-shear Class 1–2 resistance check
Euler column buckling calculatorIdeal elastic critical load and slenderness
Column axial stress calculatorGross-area stress and utilisation screen
Rectangular section properties calculatorArea, second moment, section modulus and radius
Circular section properties calculatorSolid-circle area, inertia and section modulus
I-section properties calculatorStrong- and weak-axis geometric properties
T-section properties calculatorCentroid, inertia and top/bottom section moduli
L-section properties calculatorAngle area, centroid and axis properties
Slab load to beam calculatorArea load, tributary width and line load

Site & construction 5

Concrete volume calculatorGeometric volume, allowance and order quantity
Rebar weight calculatorBar length, diameter, quantity and steel mass
Rebar spacing and quantity calculatorBar count, spacing and cut-length estimate
Earthwork volume calculatorAverage-end-area cut or fill quantity
Grade and slope calculatorRise, run, percentage, angle and ratio

Hydraulics & stormwater 12

Manning open-channel flow calculatorRectangular-channel discharge and velocity
Manning trapezoidal channel calculatorFlow from base width, depth and side slopes
Manning normal depth calculatorSolve rectangular-channel depth for target flow
Rectangular critical depth calculatorCritical depth, velocity and Froude number
Rectangular weir flow calculatorFree-flow discharge from head and crest width
Manning full-pipe flow calculatorCircular-pipe capacity and velocity
Manning pipe diameter calculatorRequired full-flow diameter for target discharge
Part-full pipe flow calculatorDepth ratio, discharge and velocity
Darcy-Weisbach head loss calculatorPipe friction and minor losses
Hazen-Williams head loss calculatorWater-pipe friction from flow, diameter and C value
Hydrostatic wall pressure calculatorPressure, thrust, centre of pressure and moment
Rational Method stormwater calculatorPeak runoff from coefficient, intensity and area

Geotechnical engineering 4

Shallow footing pressure calculatorAverage bearing pressure and utilisation
Terzaghi bearing capacity calculatorUltimate and preliminary allowable capacity
Rankine active earth pressure calculatorCoefficient, thrust and overturning moment
Retaining wall stability calculatorSliding, overturning and base-pressure screen

Engineering utility 1

Civil engineering unit converterLength, area, force and pressure conversions