Physics and Engineering

  • VinFast Charging Time From % to % Calculator
    Estimate how long your VinFast EV takes to charge from one battery percentage to another based on battery size, charger power, and charging efficiency.
  • VinFast Charging Speed (Miles Added per Hour) Calculator
    Estimate how many miles of range your VinFast EV gains per hour of charging from charger power, efficiency, battery size, and EPA range.
  • Watts to Amps Calculator
    Convert watts to amps instantly. Enter power in watts and voltage to find the current in amps using amps = watts ÷ volts. Free DC power calculator.
  • Photon Energy Calculator
    Calculate photon energy from wavelength or frequency using E = hf = hc/λ. Get results in joules, electronvolts, frequency (THz) and wavelength (nm).
  • Watts to kVA Calculator
    Convert watts (W) to kilovolt-amps (kVA) using the power factor. Fast, accurate W to kVA conversion for AC electrical systems.
  • Solar Panel Tilt Angle Calculator
    Find the optimal solar panel tilt angle from your latitude. Get year-round, summer, and winter tilt settings to maximize energy production.
  • Solar Charge Controller Sizing Calculator
    Size your solar charge controller in amps from panel wattage and battery voltage. Includes a 1.25 safety factor for MPPT/PWM controller selection.
  • Series/Parallel Battery Pack Calculator
    Calculate battery pack voltage, capacity (Ah) and energy (Wh) from cell specs and your series/parallel (SxP) configuration. Free, instant results.
  • Impedance Calculator (Z from R and X)
    Calculate AC impedance Z from resistance R and reactance X using Z = √(R² + X²). Also returns the phase angle θ in degrees instantly.
  • kW to HP Calculator
    Convert kilowatts (kW) to mechanical horsepower (hp) instantly. Uses HP = kW / 0.7457 for accurate power conversion of engines and motors.
  • HP to kW Calculator
    Convert horsepower (HP) to kilowatts (kW) instantly. Enter any HP value to get the equivalent power in kW using kW = HP × 0.7457.
  • kVA to kW Calculator
    Convert apparent power (kVA) to real power (kW) using the power factor. Free kVA to kW calculator with reactive power (kVAR) output.
  • Maximum Static Friction Calculator
    Calculate the maximum static friction force from the coefficient of static friction and the normal force using F_s,max = μ_s · N. Free physics tool.
  • Work-Energy Theorem Calculator
    Calculate net work done on an object using the work-energy theorem: W = ΔKE = ½m(vf²−vi²). Enter mass and initial/final velocities to get work in joules.
  • Keg Volume Calculator
    Find how many beers are in a keg. Enter keg size and serving ounces to get servings, gallons, fluid ounces, and liters instantly.
  • Barrel Volume Calculator
    Calculate the volume of a barrel, cask, or drum using the Kepler approximation. Enter height and the middle & end diameters to get liters and gallons.
  • Power Dissipation in a Resistor Calculator
    Calculate the power dissipated by a resistor using P = I²·R or P = V²/R. Enter current and resistance, or voltage and resistance, to get watts instantly.
  • Appliance Run Time Battery Calculator
    Estimate how long a battery will power an appliance from its Ah capacity, voltage, load watts and system efficiency. Free runtime calculator.
  • Circular Motion Speed Calculator
    Convert RPM and radius into linear (tangential) speed and angular velocity. Uses v = 2πr·(RPM/60) = ωr for any rotating object.
  • Specific Gas Constant Air Density Calculator
    Calculate humid air density from temperature, pressure and relative humidity using the specific gas constants for dry air and water vapor.
  • Pressure Head Calculator
    Calculate pressure head h = P/(ρg) in meters of fluid from pressure, density and gravity. Free online hydraulics & fluid mechanics tool.
  • Hydraulic Horsepower Calculator
    Calculate hydraulic horsepower (HHP) from flow rate in GPM and pressure in PSI using HHP = (Q × P) / 1714. Fast, free, accurate.
  • Motor Power Calculator
    Calculate mechanical motor power from torque and RPM. P = T × 2π·RPM/60, with instant output in watts, kilowatts and horsepower.
  • Energy Cost Per Hour Calculator
    Calculate the electricity cost per hour of any appliance from its wattage and your kWh rate. See hourly, daily, monthly and yearly running costs instantly.

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