Physics and Engineering

  • Motor Torque Calculator
    Calculate motor torque (N·m) from power in watts and speed in RPM using T = P / (2π·RPM/60). Free, instant electric & mechanical motor torque tool.
  • Joules to Watts Calculator
    Convert joules to watts instantly. Enter energy in joules and time in seconds to find power in watts using P = E / t. Free physics tool.
  • Watts to Joules Calculator
    Convert watts to joules instantly. Multiply power (W) by time (s) to find energy in joules, kilojoules, and watt-hours. E = P × t.
  • Conduit Fill Calculator (NEC)
    Calculate conduit fill percentage and check it against US NEC limits (53% for 1 wire, 31% for 2, 40% for 3+ wires) using wire and conduit areas.
  • Solar System ROI Calculator
    Calculate the return on investment (ROI), net profit, lifetime savings and payback period of your solar panel system. Free solar ROI calculator.
  • Voltage Drop Wire Gauge Calculator
    Find the right AWG wire gauge by amps, distance, and voltage. Picks the smallest copper or aluminum conductor keeping voltage drop under your limit (US/NEC 3%).
  • Watt-Hours to Amp-Hours Calculator
    Convert watt-hours (Wh) to amp-hours (Ah) instantly. Enter battery energy and voltage to find capacity in Ah and mAh using Ah = Wh / V.
  • Milliliters to Fluid Ounces Converter
    Convert milliliters (mL) to US fluid ounces (fl oz) instantly. Enter a volume and get the precise fluid ounce result using floz = ml / 29.5735.
  • Young's Double-Slit Calculator
    Calculate interference fringe position, spacing and diffraction angle in Young's double-slit experiment from wavelength, slit separation and screen distance.
  • Electricity Usage Monthly Cost Calculator
    Estimate the monthly electricity cost of any appliance from its wattage, daily hours of use, days per month, and your rate per kWh.
  • Belt Length Around Two Pulleys Calculator
    Calculate the approximate length of an open belt around two pulleys from their diameters and center distance using the standard belt-length formula.
  • Newton's Law of Cooling Calculator
    Calculate the temperature of a cooling (or warming) object over time with Newton's Law of Cooling and find the thermal time constant τ = 1/k.
  • Electricity Cost of Appliance Calculator
    Calculate the electricity cost of any appliance. Enter watts, hours per day, days per month and your price per kWh to get daily, monthly and yearly cost.
  • LED Current Limiting Resistor Calculator
    Calculate the series resistor needed to safely drive an LED. Enter supply voltage, LED forward voltage, and current to get resistance and power rating.
  • Antoine Equation Vapor Pressure Calculator
    Calculate vapor pressure from Antoine equation coefficients (A, B, C) and temperature. Get results in mmHg, atm, bar and kPa instantly.
  • Dynamic to Kinematic Viscosity Calculator
    Convert dynamic (absolute) viscosity to kinematic viscosity with ν = μ/ρ. Enter μ in Pa·s and density ρ in kg/m³ to get ν in m²/s, cSt and St.
  • Flow Velocity from GPM and Pipe Diameter Calculator
    Calculate water flow velocity (ft/s) from flow rate in GPM and inside pipe diameter in inches. Free pipe velocity calculator with formula and example.
  • Minor Head Loss Calculator
    Calculate minor (local) head loss in pipe fittings using hL = K·v²/(2g). Enter the loss coefficient K and flow velocity to get head loss in meters.
  • Daily Electricity Usage Calculator
    Calculate daily, monthly and yearly electricity usage in kWh and cost from any appliance's wattage, hours of use, and your cost per kWh.
  • AC Power Calculator
    Calculate real (W), reactive (VAR) and apparent (VA) power in single-phase AC circuits from voltage, current and power factor. Free online tool.
  • Stopping Distance from Friction Calculator
    Calculate the stopping distance of a sliding object from its speed and friction coefficient using d = v²/(2·μ·g). Includes deceleration and stop time.
  • Ah to Wh Calculator
    Convert battery capacity from amp-hours (Ah) to watt-hours (Wh) using Wh = Ah × V. Fast, free energy converter with kWh output.
  • Coulomb's Law Force Calculator
    Calculate the electrostatic force between two point charges with Coulomb's law: F = k·q₁·q₂/r². Enter charges and distance to get force in newtons.
  • Linear to Angular Velocity Calculator
    Convert linear velocity to angular velocity using ω = v/r. Enter speed and radius to get rad/s and RPM instantly. Free physics calculator.

Categories