Physics and Engineering

  • Amps to Milliamps Calculator
    Convert amps (A) to milliamps (mA) instantly. Enter a current value in amperes and get the equivalent in milliamps using mA = A × 1000.
  • Battery Amp-Hours Needed Calculator
    Calculate the battery amp-hours (Ah) needed from watts, runtime hours and voltage. Includes depth-of-discharge adjustment for any 12V, 24V or 48V battery.
  • Water Flow Rate Through a Hose Calculator
    Estimate water flow rate through a hose from inner diameter, supply pressure and discharge coefficient. Get liters/min, GPM and exit velocity instantly.
  • Reynolds Number for Pipe Flow Calculator
    Calculate the Reynolds number for fluid flow in a pipe from density, velocity, diameter and viscosity. Re = ρvD/μ. Find if flow is laminar or turbulent.
  • Battery State of Charge Calculator
    Estimate battery State of Charge (SOC %) from a measured voltage reading using linear interpolation between empty (Vmin) and full (Vmax) voltages.
  • Hydrostatic Pressure Calculator
    Calculate hydrostatic (fluid) pressure with P = ρgh. Get gauge and absolute pressure in Pa, kPa, bar and atm from density, gravity and depth.
  • Water Hammer Pressure Surge Calculator
    Calculate water hammer pressure surge with the Joukowsky equation. Enter fluid density, pressure wave speed and velocity change to get the surge in Pa, kPa, bar and psi.
  • Resultant Force Calculator
    Calculate the resultant of two forces acting at an angle using the parallelogram law. Get magnitude and direction in newtons instantly.
  • Two-Support Beam Reaction Calculator
    Calculate support reactions R1 and R2 for a simply supported beam with a single point load using static equilibrium equations.
  • Kilowatts to Watts Calculator
    Convert kilowatts (kW) to watts (W) instantly. Enter a power value in kW and get the exact result in watts using W = kW × 1000.
  • Watts to Kilowatts Calculator
    Convert watts (W) to kilowatts (kW) instantly. Just divide power in watts by 1000 to get kilowatts. Fast, accurate, free W to kW converter.
  • Average Acceleration Calculator
    Calculate average acceleration from initial and final velocity over a time interval using a = Δv / Δt. Free, instant, with worked example.
  • Linear Velocity from Angular Velocity Calculator
    Calculate linear (tangential) velocity from radius and angular velocity using v = r·ω. Enter radius in meters and ω in rad/s to get speed in m/s.
  • 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.
  • Lumens Needed Calculator
    Calculate how many lumens you need to light a room. Multiply floor area (m²) by the recommended lux level to get total lumens for any space.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 on the Moon Calculator
    Find your weight on the Moon instantly. Enter your Earth weight in kg or lb and see how much you'd weigh in the Moon's lower gravity.
  • Lever Mechanical Advantage Calculator
    Calculate a lever's mechanical advantage and output force from arm lengths and applied force using the law of the lever F_in·d_in = F_out·d_out.

Categories