Voltage Drop Calculator
Calculate voltage drop, load voltage, I²R loss, conductor area, and current density for DC, single-phase, or three-phase circuits.
Free Engineering Calculators
Browse 26 focused engineering calculators by discipline. Each standalone page reuses the same calculation engine as its corresponding Neutron STEM Lab workbench, giving you a fast searchable calculation first and a direct path into deeper design or simulation when you need it.
Find a calculator by discipline
Filter this directory without leaving the page, or open a discipline landing page for a focused collection.
Showing all 26 calculators.
5 focused calculators
Open Electrical calculator hub →Electrical Engineering Calculators
Focused circuit and electrical-design calculators for voltage, current, power, conductor sizing, and three-phase systems.
Wire Size Calculator
Screen 32 AWG through 4/0 AWG against voltage-drop and current-density limits using the EE Design Workbench engine.
Three-Phase Power Calculator
Calculate kVA, kW, kVAR, delivered power, phase angle, and estimated losses from line voltage, current, power factor, and efficiency.
Ohm’s Law Calculator
Solve for voltage, current, resistance, power, and conductance for an ideal resistive element.
Voltage Divider Calculator
Calculate unloaded and loaded divider output voltage, source current, load current, and loading error.
5 focused calculators
Open Electronics calculator hub →Electronics Calculators
Component-level electronics calculators for resistors, capacitors, inductors, timing networks, and resonant circuits.
RC Time Constant Calculator
Calculate RC time constant plus charging or discharging voltage, current, charge, and stored energy at a selected time.
RLC Resonant Frequency Calculator
Calculate series-RLC resonant frequency, angular frequency, quality factor, bandwidth, and approximate half-power frequencies.
LED Resistor Calculator
Calculate the required LED series resistance and resistor/LED power from supply voltage, forward voltage, and target current.
Capacitor Energy Calculator
Calculate capacitor charge and stored energy from capacitance and voltage.
Inductive Reactance Calculator
Calculate inductive reactance, RMS current, reactive power, angular frequency, and peak flux linkage.
2 focused calculators
Open Power Systems calculator hub →Power Systems Calculators
Battery, solar, and distributed-power sizing calculators for energy storage, runtime, and renewable generation planning.
Battery Runtime Calculator
Estimate usable battery energy, runtime, and DC current from bank voltage, amp-hours, usable depth of discharge, efficiency, and load.
Solar Array Size Calculator
Estimate PV array wattage, panel count, daily harvest, and charge-controller current from daily energy and solar resource assumptions.
1 focused calculator
Open Mechanical calculator hub →Mechanical Engineering Calculators
Focused machine-design calculators for gearing, speed, torque, loading, and related mechanical design checks.
Gear Ratio Calculator
Calculate gear reduction or overdrive ratio, output speed, torque, pitch-line velocity, and tangential tooth force for a spur-gear pair.
3 focused calculators
Open Structural calculator hub →Structural Mechanics Calculators
Structural mechanics calculators for stress, strain, beam deflection, column buckling, and member behavior.
Beam Deflection Calculator
Calculate maximum deflection, moment, and slope for a simply supported center load or cantilever end load.
Stress & Strain Calculator
Calculate axial stress, strain, and implied elastic modulus from force, area, deformation, and original length.
Column Buckling Calculator
Estimate Euler/Johnson column buckling capacity, slenderness ratio, effective length, and factor of safety.
3 focused calculators
Open Fluids calculator hub →Fluid Mechanics Calculators
Fluid-flow calculators for Reynolds number, pipe pressure loss, compressible-flow Mach number, and flow-regime checks.
Reynolds Number Calculator
Calculate Reynolds number and classify internal pipe flow as laminar, transitional, or turbulent from fluid and pipe conditions.
Darcy–Weisbach Pressure Loss Calculator
Calculate pipe velocity, Reynolds number, Darcy friction factor, head loss, and pressure loss from volumetric flow.
Mach Number Calculator
Calculate speed of sound and Mach number from velocity, gas properties, and static temperature.
1 focused calculator
Open Controls calculator hub →Control Systems Calculators
Focused control-system calculators for transient response, damping, overshoot, settling time, and dynamic-system behavior.
Second-Order System Calculator
Calculate damping class, overshoot, peak time, damped frequency, rise time, and settling-time estimates from natural frequency and damping ratio.
3 focused calculators
Open Aerospace calculator hub →Aerospace Calculators
Aerospace and orbital-mechanics calculators for orbit velocity, transfer maneuvers, rocket delta-v, and vehicle analysis.
Orbital Velocity Calculator
Calculate circular orbital velocity, period, local gravity, and specific orbital energy around major bodies.
Hohmann Transfer Calculator
Calculate the two ideal burns, total delta-v, and transfer time for a coplanar circular-to-circular Hohmann transfer.
Rocket Equation Delta-V Calculator
Calculate ideal and net delta-v, mass ratio, propellant mass, and propellant fraction with the Tsiolkovsky rocket equation.
2 focused calculators
Open Physics calculator hub →Physics Calculators
Focused physics calculators for mechanics, motion, energy, momentum, and foundational engineering-physics problems.
Projectile Motion Calculator
Calculate projectile flight time, range, maximum height, launch components, and impact speed without aerodynamic drag.
Kinetic Energy Calculator
Calculate kinetic energy, momentum, and equivalent specific kinetic energy from mass and speed.
1 focused calculator
Open Optics calculator hub →Optics & Photonics Calculators
Optics calculators for lens geometry, focal length, imaging relationships, and photonics design fundamentals.
Lens Focal Length Calculator
Estimate thin-lens focal length for common spherical lens forms from curvature and refractive index.