The Mechanics Calculator category covers classical physics and motion in one convenient place. Convert engine output with the Torque to Horsepower Calculator, analyze movement with the Speed Calculator and Distance & Time to Speed Calculator, and quantify stored or moving energy with the Potential Energy Calculator and Kinetic Energy Calculator.
Browse the Popular list to see which tools students and engineers use most, or flip to the Trending tab for recent favorites. Every calculator is free, runs entirely in your browser, and opens on any device.
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Displacement, Velocity, Acceleration & Time CalculatorSolve 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.
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Factor of Safety CalculatorCalculate the factor of safety (FoS) from ultimate or yield stress divided by allowable stress. Free engineering safety factor calculator with margin of safety.
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Deceleration CalculatorCalculate deceleration (negative acceleration) from initial and final velocity using either distance or time. Get m/s² and equivalent g-force instantly.
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Velocity Calculator (v² = u² + 2as)Solve the kinematic equation v² = u² + 2as for final velocity, initial velocity, acceleration, or displacement. Multiple units and significant-figure control.
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Crash / Impact Force CalculatorCalculate the average impact force of a crash or collision from mass, impact speed, and stopping distance. Get force in N, kN, energy, and g-force.
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Velocity Calculator (v = u + at)Solve v = u + at for final velocity, initial velocity, acceleration, or time. Supports m/s, km/h, mph, knots and more with automatic unit conversion.
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Centrifugal Force and Tangential Velocity CalculatorCompute centrifugal force (N and kgf) and tangential velocity (m/s and km/h) for an object rotating in a circle from its mass, radius, and rotation speed.
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Gravitational Potential Energy CalculatorCalculate gravitational potential energy with PE = m·g·h. Enter mass, gravity, and height to get the energy in joules instantly.
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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.
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Travelers' Meeting Time CalculatorFind how long until two people walking toward each other meet. Enter distance and both speeds in m, km, m/min, m/s, km/h and more. Free and instant.
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Tidal Force of the Moon and Sun CalculatorCompute the gravitational and tidal (differential) force the Moon and Sun exert on Earth per unit mass, plus ratios to the Moon's tidal force at perigee.
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Speed CalculatorSpeed Calculator - Calculate your speed by entering distance (km) and time (hours, minutes). Instantly get your speed in km/h.
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Thin Rod Center of Mass CalculatorFind the center of mass of two particles along a line from their masses and positions using x_cm = (m₁x₁ + m₂x₂)/(m₁+m₂). Free physics tool.
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Bolt Torque CalculatorCalculate 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.
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Escape Velocity from a Planet and the Solar System CalculatorCompute escape velocity from a planet, the Sun, the Moon or an asteroid surface, plus the speed to escape the Solar System from its orbit. Pick a preset or enter values.
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Projectile Motion CalculatorCalculate projectile range, maximum height and time of flight from initial velocity, launch angle and gravity using classic kinematics formulas.
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Terminal Velocity CalculatorCalculate the terminal velocity of a falling object from its mass, drag coefficient, cross-sectional area and fluid density. Results in m/s, km/h and mph.
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Spring-Mass Oscillation Period CalculatorCalculate the period, frequency and angular frequency of a mass on a spring using T = 2π√(m/k). Free online simple harmonic motion calculator.
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Acceleration Conversion CalculatorConvert acceleration between g, m/s², ft/s², cm/s² (Gal) and in/s² instantly. Free, accurate acceleration unit converter with formula and worked example.
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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.
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Hoop Stress Calculator (Thin-Wall Pipe)Calculate hoop (circumferential) and axial stress in a thin-wall pressurized pipe or cylinder using σ = PD/2t. Enter pressure, diameter and wall thickness.
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Hydrostatic Pressure CalculatorCalculate hydrostatic (fluid) pressure with P = ρgh. Get gauge and absolute pressure in Pa, kPa, bar and atm from density, gravity and depth.
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Resultant Force CalculatorCalculate the resultant of two forces acting at an angle using the parallelogram law. Get magnitude and direction in newtons instantly.
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Two-Support Beam Reaction CalculatorCalculate support reactions R1 and R2 for a simply supported beam with a single point load using static equilibrium equations.
Frequently asked questions
What physics and engineering problems can these solve?
The collection covers kinematics, energy, and rotational mechanics: find speed from distance and time, calculate how long a trip takes at a given speed, convert torque to horsepower for engine specs, compute kinetic or potential energy for an object, and work out angular velocity for rotating systems.
Is it free to use?
Yes — every calculator is free with no login, no subscription, and nothing to install. They work in any browser on a phone, tablet, or laptop.
How accurate are the calculations?
The tools apply standard Newtonian mechanics formulas such as KE = ½mv², PE = mgh, and P = Tω. Results are accurate for academic problems and general engineering estimates. For any safety-critical or code-governed application — structural analysis, vehicle design, industrial machinery — verify calculations against the applicable engineering standard and have a qualified engineer review the work.
Do these calculators store what I enter?
No. All calculations happen entirely in your browser. None of your inputs are sent to a server, logged, or stored — they disappear the moment you close or refresh the page.
Which mechanics calculators are used most?
The Popular list orders every tool by real visitor traffic, so the most-relied-upon calculators appear first. Switch to Trending to catch what's rising quickly, Recently Added for new tools, or Last Updated for recently revised calculators.
