Physics and Engineering

  • Motor Full Load Current Calculator
    Calculate the full load amperes (FLA) of single- and three-phase electric motors from horsepower, voltage, efficiency, and power factor.
  • Three-Phase Current Calculator
    Calculate three-phase line current in amps from power, line voltage and power factor using I = P / (√3 × V × PF). Free and instant.
  • Capacitor Discharge Calculator (RC)
    Calculate the voltage across a discharging capacitor in an RC circuit using V(t)=V₀·e^(−t/RC). Find time constant, percent remaining and current.
  • RC / RL Time Constant Calculator (τ)
    Calculate the time constant τ for RC and RL circuits. RC: τ = R·C, RL: τ = L/R. Get τ in seconds, ms, µs and the 5τ settling time.
  • Power Factor Correction Calculator
    Calculate the kVAR capacitor bank and capacitance (µF) needed to correct power factor from a current to target value at any voltage and frequency.
  • Amps to Volts Calculator
    Convert amps to volts using power (V = P/I) or resistance (V = I×R). Free online amps to volts calculator with worked examples and formulas.
  • Electric Charge Calculator (Q = I × t)
    Calculate electric charge (coulombs) from current and time using Q = I × t. Get charge in coulombs, milliamp-hours, and electron count instantly.
  • kW to kWh Calculator
    Convert kilowatts (kW) to kilowatt-hours (kWh) by multiplying power by running time. Free, instant energy calculator with watt-hour output.
  • Volts to Amps Calculator
    Convert volts to amps using power (I = P/V) or resistance (I = V/R). Free electrical calculator for current in amperes from voltage.
  • Watts to Volts Calculator
    Convert watts to volts instantly. Enter power in watts and current in amps to find voltage using V = P / I. Free online electrical calculator.
  • Deceleration Calculator
    Calculate deceleration (negative acceleration) from initial and final velocity using either distance or time. Get m/s² and equivalent g-force instantly.
  • Crash / Impact Force Calculator
    Calculate the average impact force of a crash or collision from mass, impact speed, and stopping distance. Get force in N, kN, energy, and g-force.
  • RPM to Linear Speed Calculator
    Convert RPM to linear surface speed using v = π × D × RPM. Enter diameter and rotational speed to get m/s, km/h, ft/min, and mph instantly.
  • Simply Supported Beam Deflection Calculator (Center Point Load)
    Calculate the maximum mid-span deflection of a simply supported beam under a central point load using δ = PL³ / (48EI). Free engineering tool.
  • Pulley System Mechanical Advantage Calculator
    Calculate the mechanical advantage of a pulley system and the effort force needed to lift a load. Enter supporting rope segments and load weight.
  • Projectile Maximum Height Calculator
    Find the maximum height of a projectile from its initial velocity and launch angle. Uses H = (v·sinθ)²/(2g) with adjustable gravity.
  • Projectile Time of Flight Calculator
    Calculate the time of flight of a projectile from its initial velocity and launch angle. Also returns maximum height and horizontal range.
  • Power Calculator
    Calculate power in watts from work (energy) and time using P = W / t. Free physics power calculator with horsepower conversion and worked examples.
  • VinFast Home Charger Electricity Cost Calculator
    Estimate the monthly and annual electricity cost of charging your VinFast EV at home based on miles driven, efficiency, and your kWh rate.
  • RF Link Budget Calculator
    Calculate received RF signal power (dBm) from transmit power, antenna gains, path loss, and system losses. Free link budget calculator with EIRP.
  • EIRP Calculator
    Calculate EIRP (Effective Isotropic Radiated Power) in dBm, dBW and watts from transmitter power, antenna gain and cable loss.
  • Braking Distance Calculator
    Calculate vehicle braking distance from speed, road friction coefficient and gravity. Find how many meters or feet it takes to stop using physics.
  • Monthly Electricity Bill Estimator
    Estimate your monthly electricity bill from kWh usage, your rate per kWh, and any fixed service charge. See monthly and annual cost instantly.
  • Volts, Amps, Watts, Ohms Calculator
    Ohm's law calculator: enter any two of voltage, current, resistance or power and instantly compute the other two using V=IR, P=VI, P=I²R, P=V²/R.

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