— Calculators
General
Mechanical
Stress & Strength of Materials
- Statics solver (beams, rigid bodies, forces)
- Truss solver (method of joints)
- Stress/strain (axial, bending, shear)
- Beam deflection
- Factor of safety
- Euler column buckling
- Torsion/shaft stress
- Mohr's circle / principal & von Mises stress
- Fatigue life (S-N curve & strain-life)
- Thin-wall pressure vessel stress
Machine Design
Fluid Mechanics
Thermodynamics & Heat Transfer
HVAC
Dynamics & Vibrations
Manufacturing / Machining
Materials
Electrical
Circuit Analysis
- Ohm's Law & Power (V, I, R, P solver)
- Series/parallel resistance
- Series/parallel capacitance
- Series/parallel inductance
- Voltage divider
- Current divider
- Kirchhoff's laws solver
- Thevenin/Norton equivalent
- RC/RL/RLC time constant (incl. capacitor charge/discharge)
- Resonant frequency (LC circuits)
- Impedance calculator (complex Z)
Power
Electronics / Components
- Resistor color code decoder
- Resistor value from color code (reverse)
- LED resistor sizing
- Op-amp gain (inverting/non-inverting)
- Filter design (low/high/band-pass, cutoff & bandwidth)
- Voltage regulator/divider for zener
- Battery internal resistance
- 555 timer frequency/duty cycle
- PWM duty cycle calculator
Batteries & Energy Storage
Motors & Electromechanical
Electromagnetics
Signals & Communications
PCB & Wiring
Civil
Structural Analysis
Structural Design
Steel Design
Concrete & Reinforcement
Geotechnical
Concrete & Earthwork
Hydraulics & Site
- Open channel flow (Manning's equation)
- Rational method stormwater runoff
- Slope/grade calculator
- Time of concentration (Kirpich / FAA / NRCS)
- Hazen–Williams pressure pipe flow
- Sharp-crested weir flow (rectangular / V-notch)
- Culvert capacity — inlet control (approx.)
- Detention basin storage (modified rational)
- Hydraulic jump (sequent depth, energy loss)
- Rainfall intensity from IDF coefficients