Physics and Engineering

  • Period and Frequency Calculator
    Convert between period and frequency instantly. Compute T = 1/f or f = 1/T plus angular frequency for any wave or oscillation.
  • Solar Panel Battery Charge Time Calculator
    Estimate how many hours of sunlight a solar panel needs to charge a battery from your battery Wh, panel watts, and system efficiency.
  • Impact Velocity from Drop Height Calculator
    Calculate the impact velocity of an object dropped from a given height using v = √(2gh). Get speed in m/s, km/h and the fall time instantly.
  • Thevenin Equivalent Calculator
    Compute the Thevenin equivalent of a circuit. Enter open-circuit voltage and short-circuit current to find Thevenin voltage Vth and resistance Rth.
  • Colebrook-White Friction Factor Calculator
    Solve the implicit Colebrook-White equation for the Darcy friction factor f from Reynolds number, pipe roughness and diameter. Free engineering tool.
  • Hydraulic Press Force Calculator
    Calculate hydraulic press output force using Pascal's law. Enter input force and both piston areas to find F2 = F1 × (A2/A1) plus system pressure.
  • Swamee-Jain Friction Factor Calculator
    Calculate the Darcy friction factor for turbulent pipe flow using the Swamee-Jain explicit equation from roughness, diameter, and Reynolds number.
  • NPSH Available Calculator
    Calculate Net Positive Suction Head available (NPSHa) for centrifugal pumps to avoid cavitation, using surface pressure, vapor pressure, density and head losses.
  • Peak-to-Peak Voltage Calculator
    Convert between peak-to-peak (Vpp), peak (Vpeak) and RMS (Vrms) voltage for a sine wave. Enter any one value to get the others instantly.
  • Magnetic Field of a Long Straight Wire Calculator
    Calculate the magnetic field B around a long straight current-carrying wire using B = µ0·I/(2π·r). Enter current and distance to get tesla, µT and gauss.
  • Resistance Temperature Coefficient Calculator
    Calculate how a conductor resistance changes with temperature using R = R₀(1 + α·ΔT). Enter reference resistance, temperature coefficient and temperatures.
  • Electric Potential Energy Calculator
    Calculate the electric potential energy between two point charges using U = kQ1Q2/r. Enter charges in coulombs and distance in meters to get joules.
  • Battery C-Rate Calculator
    Calculate charge/discharge current from battery capacity and C-rate using I = C-rate × Capacity. Get amps plus the theoretical full charge/discharge time.
  • Synchronous Speed Calculator
    Calculate the synchronous speed of an AC motor or generator from supply frequency and number of poles using Ns = 120f/P. Get results in RPM and rev/s.
  • Weight to Mass Calculator
    Convert weight (force in newtons) to mass in kilograms using m = W / g. Enter weight and gravitational acceleration to get mass instantly.
  • Area Moment of Inertia Calculator
    Calculate the second moment of area (area moment of inertia) for rectangular and circular beam cross-sections, plus section modulus and radius of gyration.
  • LC Resonant Frequency Calculator
    Calculate the resonant frequency of an LC circuit from inductance and capacitance using f = 1/(2π√(LC)). Supports H, mH, µH, nH, F, µF, nF, pF.
  • Section Modulus of a Rectangular Beam Calculator
    Calculate the elastic section modulus S = b·h²/6 of a rectangular beam cross-section, plus moment of inertia and area. Fast, accurate engineering tool.
  • VinFast Charge Time from Amps Calculator
    Estimate VinFast EV charging time from charger power (kW), battery capacity, and start/target charge percent. Quick, simple hours and minutes estimate.
  • RPM to Angular Velocity Calculator
    Convert RPM to angular velocity in radians per second instantly. Uses ω = RPM × 2π / 60, with degrees/second and Hz outputs too.
  • Thermal Conduction Heat Flow Calculator
    Calculate conductive heat flow rate and heat flux through a material using Fourier's Law: Q/t = k·A·ΔT/d. Enter conductivity, area, thickness and temperatures.
  • Speed from Skid Mark Calculator
    Estimate a vehicle's minimum speed from skid mark length, road drag factor, and braking efficiency. Outputs mph, km/h, ft/s, and m/s instantly.
  • LED Wire Voltage Drop Calculator
    Calculate the voltage drop in wires feeding an LED or LED strip. Enter current, length, wire area and material to find loss, voltage at the LED and power waste.
  • Cost Per kWh Calculator
    Find your effective electricity rate per kWh by dividing your total monthly bill by the kilowatt-hours used. Fast, free energy cost calculator.

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