Physics and Engineering

  • Air Density Calculator
    Calculate the density of dry air from pressure and temperature using the ideal gas law (ρ = P / (R·T), R = 287.058 J/kg·K).
  • Energy to Wavelength Calculator
    Convert photon energy (in eV or joules) to wavelength using λ = hc/E. Get wavelength in nm and meters plus frequency instantly.
  • Specific Heat Calculator
    Calculate specific heat capacity from heat energy, mass, and temperature change using c = Q / (m·ΔT). Fast, accurate physics tool with worked example.
  • Displacement, Velocity, Acceleration & Time Calculator
    Solve s = ut + ½at² for displacement, initial velocity, acceleration, or time. Pick any unknown, enter the other three with units, and get the SI-accurate answer.
  • Hooke's Law Calculator (F = -kx)
    Solve Hooke's Law F = -kx for spring force, spring constant, displacement, or the acceleration of an attached mass, with full unit conversion.
  • GPM Flow Rate Calculator (Pipe)
    Calculate pipe flow rate in GPM from flow velocity (ft/s) and inside diameter (inches). Free gallons-per-minute calculator using velocity × area × 448.831.
  • Projectile Range Calculator
    Calculate the horizontal range of a projectile from launch velocity and angle using R = v²·sin(2θ)/g. Also returns max height and flight time.
  • Speed, Distance & Time Calculator
    Free Speed, Distance & Time calculator. Solve for speed, distance, or time using d = s × t. Supports km, miles, meters, hours, minutes & seconds.
  • EV Cost Per Mile Calculator
    Calculate the energy cost per mile of your electric vehicle from its efficiency (miles/kWh) and your electricity rate. See cost per 100 miles and trip cost.
  • Spring-Mass Oscillation Period Calculator
    Calculate the period, frequency and angular frequency of a mass on a spring using T = 2π√(m/k). Free online simple harmonic motion calculator.
  • 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.
  • Wire Gauge (AWG) Calculator
    Convert American Wire Gauge (AWG) to conductor diameter and cross-sectional area, and estimate copper wire current capacity (ampacity) by density.
  • Kinematic Viscosity Calculator
    Calculate kinematic viscosity (ν) from dynamic viscosity (μ) and density (ρ) using ν = μ/ρ. Get results in m²/s, Stokes, and centistokes.
  • Air Flow Rate Calculator From Pressure and Diameter
    Calculate air flow rate from pressure difference and pipe diameter. Get volumetric flow in m³/s, m³/h and CFM plus velocity using Bernoulli equation.
  • Acceleration Conversion Calculator
    Convert acceleration between g, m/s², ft/s², cm/s² (Gal) and in/s² instantly. Free, accurate acceleration unit converter with formula and worked example.
  • Weight Calculator (W = mg)
    Solve W = m*g for weight, mass, or gravity with full unit conversion (N, lbf, kgf, kg, lb, m/s2, ft/s2). Free physics calculator based on Newton's second law.
  • Home Solar Panel Calculator
    Estimate how many solar panels and what system size (kW) you need based on your monthly electricity use, peak sun hours, panel wattage and efficiency.
  • Voltage Drop Calculator (mm²)
    Calculate cable voltage drop in volts and percent for single-phase and three-phase copper or aluminium conductors sized in mm², by current and length.
  • 3 Phase Voltage Drop Calculator
    Calculate three-phase voltage drop from load current, cable length, conductor resistivity, cross-section and power factor. Get volts dropped and percentage.
  • Manning's Pipe Flow Calculator
    Compute flow rate (discharge), velocity, area and hydraulic radius in a circular pipe using the Manning equation for full or partially full pipes.
  • 18650 Battery Pack Calculator
    Calculate the voltage, capacity (Ah), total cell count and energy (Wh) of an 18650 battery pack from any series-parallel (SxP) configuration.
  • DC Voltage Drop Calculator
    Calculate DC voltage drop across wire from current, length, and resistance. Get volts dropped, drop percentage, and voltage at the load instantly.
  • Density, Mass and Volume Solver
    Solve the density formula ρ = m/V for density, mass or volume. Enter any two values and instantly get the third with this free physics calculator.
  • Ohm's Law Solver (V = IR)
    Solve Ohm's Law (V = IR) for voltage, current, or resistance. Enter any two values to instantly find the third, plus power dissipation.

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