Mechanics Calculator

  • Reduced Mass Calculator
    Calculate the reduced mass of a two-body system instantly using μ = (m₁·m₂)/(m₁+m₂). Enter two masses to get the effective reduced mass.
  • Pounds per Square Inch (PSI) Calculator
    Calculate pressure in pounds per square inch (PSI) from force and area using P = F / A. Fast, accurate, free online PSI calculator.
  • Tension Calculator
    Calculate the tension force in a rope or cable holding a mass, with optional vertical acceleration. Uses T = m(g + a). Free physics tool.
  • Newton Meter Torque Calculator
    Calculate torque in newton-metres (Nm) from force in newtons and lever-arm distance in metres. Free, instant torque calculator with formula and example.
  • Torque to Horsepower Calculator
    Convert torque (lb-ft) and engine RPM to horsepower instantly. Uses hp = (torque × RPM) ÷ 5252. Free, accurate automotive power calculator.
  • Biot Number Calculator
    Calculate the Biot number (Bi = h·Lc/k) from convective coefficient, characteristic length and thermal conductivity to check lumped capacitance validity.
  • Thread Pitch Calculator
    Calculate thread pitch from TPI or threads per mm. Converts imperial threads-per-inch and metric pitch instantly with full mm/inch output.
  • Compression Ratio Calculator
    Calculate engine compression ratio (CR) from bore, stroke and clearance volume. Computes swept displacement and CR instantly for any cylinder.
  • Compression Ratio to PSI Calculator
    Convert engine compression ratio to estimated cranking PSI using the polytropic formula P = P_atm × CR^n. Adjust exponent and atmospheric pressure.
  • Fuel Pump Calculator
    Calculate the fuel pump flow (LPH, lb/hr, gal/hr, cc/min) needed for your target horsepower using BSFC and pump duty cycle.
  • Speedometer Gear Calculator
    Calculate the correct driven gear teeth for an accurate speedometer from drive gear teeth, tire revs/mile, and speedo revs/mile.
  • Force to Horsepower Calculator
    Calculate force to horsepower quickly and accurately with this easy-to-use converter. Input force (lbs), distance (ft), and time (seconds) to determine power output in horsepower.
  • Torque to Horsepower Calculator
    Calculate torque to horsepower conversion with precision. Enter torque, engine speed (RPM), and choose units (lb-ft or N-m) for accurate power output estimation. Optimize engine performance now!
  • Belt Length Calculator
    Calculate the required V-belt or flat belt length from pulley diameters and center distance using the standard two-pulley belt length formula.
  • Wheel Horsepower Calculator
    Calculate wheel horsepower (WHP) from crank/engine horsepower and drivetrain loss percentage. Estimate power at the wheels instantly.
  • Wheel Offset Calculator
    Convert wheel width and backspacing into offset (ET) in millimeters. Find positive, negative, or zero offset instantly for any wheel fitment.
  • Winch Size Calculator
    Calculate the minimum winch capacity for your vehicle using its weight and a safety factor. Find the right rated line pull for safe recovery.
  • Moment of Inertia Calculator
    Calculate the moment of inertia for a solid disk, solid sphere, thin rod, or rectangular area using standard physics and engineering formulas.
  • Displacement Calculator
    Calculate displacement in kinematics with this versatile calculator. Input initial velocity, final velocity, and time to determine displacement. Easily switch between displacement, velocity, and time calculations for comprehensive kinematic analysis.
  • Rotational Speed (Angular & Tangential Velocity) from Centrifugal Force
    Compute rotational speed (rps, rad/s) and tangential velocity (m/s, km/h) from mass, radius, and centrifugal force using F = m·ω²·r. Free physics calculator.
  • Ballistic Coefficient Calculator
    Calculate a bullet's ballistic coefficient (BC) from mass, diameter, and form factor. Enter grains and inches to get BC and sectional density instantly.
  • Forced Oscillation Displacement Calculator
    Compute the steady-state displacement, amplitude and phase lag of a driven damped harmonic oscillator subjected to a sinusoidal force.
  • Free Fall Energy and Velocity Calculator
    Calculate the kinetic energy (J and kWh) and impact velocity of an object falling freely from rest through a given drop height, with editable gravity.
  • Average Velocity Calculator (from Initial and Final Velocity)
    Free average velocity calculator: find average, initial, or final velocity using v_avg = (v + u)/2. Mix units (m/s, km/h, mph, ft/s, knots) for constant acceleration.

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