Physics and Engineering

  • Elastic Collision Calculator
    Calculate the final velocities of two objects after a 1D elastic collision from their masses and initial velocities. Momentum and kinetic energy are conserved.
  • Centripetal Acceleration Calculator
    Calculate centripetal acceleration from tangential velocity and radius using a = v²/r. Free physics calculator with worked example and formula.
  • Speed of Sound in Air Calculator
    Calculate the speed of sound in air from temperature using v = 331.3·√(1 + T/273.15). Get results in m/s, km/h and mph instantly.
  • RC Time Constant Calculator
    Calculate the RC time constant τ = R·C and the capacitor charging/discharging voltage at any time t. Free online tool with worked example and formulas.
  • Stress and Strain Calculator
    Calculate stress, strain and Young's modulus from force, area, elongation and length. Free engineering tool with formulas and a worked example.
  • Continuity Equation Flow Rate Calculator
    Calculate volumetric flow rate Q = A·v and downstream velocity using the continuity equation A₁v₁ = A₂v₂ for circular pipes. Free and instant.
  • Spring Constant Calculator
    Calculate the spring constant k from applied force and displacement using Hooke's Law (k = F/x). Also computes elastic potential energy. Free physics tool.
  • mAh to Wh Battery Capacity Calculator
    Convert battery capacity from mAh to Wh instantly. Enter milliamp-hours and voltage to get watt-hours and kilowatt-hours for any battery.
  • IoT Sensor Battery Life Calculator
    Estimate how long an IoT sensor or wireless device will run from its battery using capacity (mAh), average current draw (mA), and a usable-capacity derating factor.
  • Solar Panel Payback & ROI Calculator
    Calculate your solar panel payback period and ROI. Enter system cost, annual savings, and lifespan to see break-even years, lifetime savings, and return.
  • Surface Feet per Minute (SFM) Calculator
    Calculate SFM (surface feet per minute) from RPM and tool diameter, or solve for spindle RPM from a target cutting speed. Free machining speed tool.
  • Tap Drill Size Calculator
    Calculate the correct tap drill size for imperial (TPI) or metric (pitch) threads using thread engagement percentage. Fast, accurate machinist tool.
  • Wavelength to Frequency Calculator
    Convert wavelength to frequency or frequency to wavelength using λ = c / f. Uses the speed of light by default; supports any wave speed.
  • Hydraulic Cylinder Force Calculator
    Calculate hydraulic cylinder push and pull force from pressure and bore/rod diameter. Supports bar & mm or psi & inches. F = P × A.
  • Shaft Torque from Power Calculator
    Calculate shaft torque from motor power and RPM. Enter kilowatts or horsepower and speed to get torque in N·m and lb-ft instantly.
  • Solar Panel Number Calculator
    Calculate how many solar panels you need based on daily kWh energy use, panel wattage, peak sun hours, and system efficiency derating.
  • Pulley RPM & Speed Calculator
    Calculate driven pulley RPM from driver pulley diameter, speed, and driven diameter using N2 = N1 × D1 / D2. Find belt drive ratio fast.
  • kVA Calculator
    Calculate apparent power in kVA from voltage and current for single-phase and three-phase circuits. Free, instant kVA calculator with formula.
  • Pipe Flow Velocity Calculator
    Calculate fluid velocity in a pipe from flow rate and inner diameter using v = Q / (π/4 × D²). Free, instant pipe flow speed calculator.
  • Generator Size Calculator
    Calculate the right generator size in watts. Add running watts plus the largest starting surge, with a safety margin, to size your generator correctly.
  • Device Power Consumption Cost Calculator
    Calculate how much electricity a device costs to run. Enter watts, hours per day, days and your price per kWh to get total and daily running cost.
  • Round Pool Volume Calculator
    Calculate the water volume of a round (circular) swimming pool in US gallons and cubic feet from its diameter and average depth.
  • Rectangular Pool Gallons Calculator
    Calculate how many gallons of water your rectangular swimming pool holds using length, width, and average depth. Free, instant pool volume calculator.
  • Water Tank Capacity Calculator
    Calculate water tank capacity in liters for rectangular or cylindrical tanks. Enter dimensions in meters to get volume, liters and US gallons instantly.

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