Mechanics Calculator

  • Relativistic Velocity Addition Calculator
    Add two velocities the relativistic way. Special-relativity velocity-addition formula keeps the combined speed below c = 299792.458 km/s. Enter in km/s.
  • Boost Horsepower Calculator
    Estimate boosted horsepower from your naturally aspirated HP and boost pressure (PSI). Quick turbo and supercharger power gain calculator.
  • BSFC (Brake Specific Fuel Consumption) Calculator
    Calculate Brake Specific Fuel Consumption (BSFC) from fuel consumption rate and power output. Get results in kg/(kW·h) and g/(kW·h) instantly.
  • 0-60 mph Acceleration Calculator
    Estimate a vehicle's 0-60 mph time from engine power, weight, and drivetrain efficiency using a physics-based energy and acceleration model.
  • Boat Speed Calculator
    Calculate a displacement boat's maximum hull speed from its waterline length using the classic 1.34 × √LWL formula. Get results in knots, mph and km/h.
  • 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.
  • Wheel Horsepower Calculator
    Calculate wheel horsepower (WHP) from crank/engine horsepower and drivetrain loss percentage. Estimate power at the wheels instantly.
  • Speedometer Gear Calculator
    Calculate the correct driven gear teeth for an accurate speedometer from drive gear teeth, tire revs/mile, and speedo revs/mile.
  • 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.
  • Compression Ratio Calculator
    Calculate engine compression ratio (CR) from bore, stroke and clearance volume. Computes swept displacement and CR instantly for any cylinder.
  • 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.
  • Torque to Horsepower Calculator
    Convert torque (lb-ft) and engine RPM to horsepower instantly. Uses hp = (torque × RPM) ÷ 5252. Free, accurate automotive power calculator.
  • 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.
  • Taper Calculator
    Calculate machining taper per unit length, taper percent, and the included and half taper angles from large diameter, small diameter, and length.
  • Spindle Speed Calculator
    Calculate spindle speed (RPM) from cutting speed and tool diameter for milling, turning and drilling. Supports metric (m/min) and imperial (SFM) units.
  • Punch Force Calculator
    Calculate the punch force needed to pierce or blank sheet metal from cut perimeter, thickness and shear strength. Get results in kN, N and tonnes-force.
  • K-Factor Calculator
    Calculate the K-factor for sheet metal bending from bend allowance, bend angle, inside radius and material thickness. Free, instant, accurate.
  • Material Removal Rate Calculator
    Calculate Material Removal Rate (MRR) from depth of cut, width of cut, and feed rate. Free machining MRR calculator in mm³/min and cm³/min.
  • Pitch Diameter Calculator
    Calculate the pitch diameter of a spur gear from its number of teeth and diametral pitch. Free gear design calculator with the formula D = N / P.
  • Bolt Torque Calculator
    Calculate the tightening torque for a bolt from the nut factor (K), target clamp force, and bolt diameter using T = K·F·d. Results in N·m, lb-ft, in-lb.
  • Bending Stress Calculator
    Calculate bending stress in a beam using σ = M·c/I. Enter bending moment, distance to outer fiber, and moment of inertia to get stress in MPa and Pa.
  • Beam Load Calculator
    Calculate the maximum bending moment, shear force and support reactions of a simply supported beam under a uniformly distributed load (UDL).

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