Engineering sections
Choose a section first, then open the calculators and guides that match that discipline.
Fluids & Process
Pipe flow, pressure loss, pumps, valves, open-channel flow, and practical process calculations.
Mechanical Design
Beam mechanics, shaft stress, section properties, buckling, tolerancing, and machine-element quick checks.
Electrical & Power
Voltage drop, power relations, battery sizing, conductor resistance, and practical installation-level electrical math.
Civil / Geotech / Survey
Earthwork, bearing capacity, runoff, survey geometry, and preliminary site/civil quick checks.
Thermal & HVAC
Psychrometrics, dew point, duct sizing, heat loads, and practical HVAC estimation workflows.
Manufacturing & Tolerancing
Fits, machining calculations, tolerance stack-up, bend allowance, and practical fabrication helpers.
Solar & Energy
PV output, battery banks, inverters, autonomy, and small-system solar planning helpers.
Acoustics & Vibration
Sound level math, reverberation, vibration frequency, and simple natural-frequency estimators.
Controls & Instrumentation
Signal scaling, 4-20 mA conversions, calibration math, PID helpers, and instrumentation quick tools.
Aero & Compressible Flow
Mach number, isentropic relations, stagnation properties, and compact compressible-flow fundamentals.
Live calculators
Start with the calculators already available for this section, then open the related guides when you need more context.
Pressure Drop Calculator
Estimate pipe pressure loss with the Darcy–Weisbach equation — browser-based, explicit inputs.
Pipe Velocity Calculator
Mean fluid velocity from flow rate and pipe inside diameter.
Reynolds Number Calculator
Reynolds number from velocity, diameter, and kinematic viscosity.
Pump Affinity Laws Calculator
Scale flow, head, and power with pump speed using affinity laws.
Beam Deflection Calculator
Euler-Bernoulli peak deflection for prismatic beams — four standard load cases.
Shear & Bending Moment Calculator
Peak shear and bending moment for ideal simply supported and cantilever cases.
Shaft Torque & Stress Calculator
Torsional shear stress and angle of twist for solid or hollow circular shafts.
Tolerance Stack-Up Calculator
Linear stack-up from nominal dimensions and bilateral tolerances with worst-case and RSS views.
Guides for this section
Published guides help explain assumptions, formulas, and the next step after a quick calculator result.
Use this guide for quick engineering checks when you need transparent assumptions and repeatable pressure-loss estimates before detailed hydraulic modeling.
Primary tool: Pressure Drop Calculator
Use this guide when you need a fast, defensible flow-regime check before choosing correlations or pressure-drop assumptions in early engineering work.
Primary tool: Reynolds Number Calculator
Use this guide for rapid what-if checks on variable-speed operation, while being explicit that affinity laws are approximations around similar hydraulic conditions.
Primary tool: Pump Affinity Laws Calculator
Use this guide for preliminary electrical checks where transparent resistance assumptions are required before detailed code-based design.
Primary tool: Voltage Drop Calculator
Use this guide when you need fast clarity on balanced three-phase power relationships and where simplified formulas are valid.
Primary tool: Three-Phase Power Calculator
Use this guide for quick condensation-risk screening where you need explicit equations and assumptions, not a black-box psychrometric app.
Primary tool: Dew Point Calculator
Use this guide for transparent first-pass serviceability screening before detailed structural analysis or code-compliant design workflows.
Primary tool: Beam Deflection Calculator
Use this guide when you need to explain how a shaft can carry torque yet still fail on stress or stiffness long before a detailed machine-element study is complete.
Primary tool: Shaft Torque & Stress Calculator
Engineering FAQ
Who is this Engineering section for?
It is built for engineers, technicians, students, and technical teams who need fast browser-based checks before moving into detailed design software or project documentation.
Are these tools enough for final design sign-off?
No. They are intended for preliminary sizing, sanity checks, and teaching-oriented workflows. Final design, compliance, and stamped deliverables still require project-specific engineering work.
How should I navigate the section?
Start from the Engineering hub, choose the section that matches your discipline, then open the calculators and guides that fit your task. Each section is organized around a coherent family of tools.