Mechanical
Gear Ratio
Calculate gear ratio, output speed and torque for a simple spur gear pair. Instant results with…
All Engineering Calculators
188 tools across 19 disciplines — free, transparent formulas, no sign-up.
By course:AP / IB PhysicsIntro ChemistryStatics & Mechanics of MaterialsCircuits IFluid MechanicsThermodynamics & Heat TransferSignals & Control SystemsStatistics & Data Analysis
Mechanical
Heat Transfer (Conduction)
Calculate heat transfer rate through a flat wall using Fourier's Law. Returns heat flux and the…
Electrical
Ohm's Law
Calculate current, power and energy using Ohm's Law. Instant V=IR calculator with AI-explained …
Electrical
Wire Gauge & Ampacity
Calculate AWG wire diameter, cross-sectional area, resistance and NEC ampacity. Covers AWG 0–40…
Electrical
Voltage Divider
Calculate output voltage, current and power dissipation for a two-resistor voltage divider. Ins…
Electrical
RC Time Constant
Calculate RC circuit time constant, -3dB cutoff frequency and capacitor charge time. Returns τ,…
Structural
Moment of Inertia
Calculate second moment of area (Ixx, Iyy) for rectangle, circle, hollow rectangle and hollow c…
Chemical
Reynolds Number
Calculate the Reynolds number and determine flow regime (laminar, transitional, turbulent) for …
Chemical
Pump Power
Calculate centrifugal pump hydraulic power, shaft power and efficiency. Returns kW, horsepower …
Chemical
Antoine Vapour Pressure
Calculate saturation vapour pressure using the Antoine equation for water, methanol, ethanol, b…
Electrical
LED Resistor Calculator
Calculate the correct current-limiting resistor for an LED. Enter supply voltage, LED forward v…
Electrical
Battery Life Estimator
Estimate battery runtime in hours and days from capacity (mAh/Ah) and average discharge current…
Electrical
Transformer Turns Ratio
Calculate transformer turns ratio, primary and secondary currents from voltages and apparent po…
Electrical
dB / dBm Converter
Convert between milliwatts, watts, dBm and dBW. Essential for RF, audio, and telecommunications…
Mechanical
Thermal Expansion
Calculate linear thermal expansion of pipes, rods and structures. Enter coefficient of thermal …
Mechanical
Engine Displacement
Calculate engine displacement in litres and cc, swept volume per cylinder, and compression rati…
Physics
Projectile Motion
Calculate projectile range, maximum height, time of flight and trajectory from initial velocity…
Physics
Pendulum Period
Calculate the period and frequency of a simple pendulum from its length and gravitational accel…
Physics
Kinematics Solver
Calculate final velocity, displacement and average velocity using SUVAT equations for constant …
Physics
Ideal Gas Law
Calculate pressure, volume or temperature using the ideal gas law PV=nRT. Supports Pa, kPa and …
Physics
Work, Energy & Power
Calculate kinetic energy, potential energy, work done and mechanical power in one tool. Essenti…
Physics
Wave Properties
Calculate wave speed, period, angular frequency and wave number from frequency and wavelength. …
Physics
Snell's Law
Calculate the refraction angle, critical angle and Fresnel reflectance using Snell's law n₁sinθ…
Neuroscience
Neuron Firing Rate
Calculate neuron firing rate in Hz, mean ISI, and coefficient of variation from spike count and…
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