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.
-
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.
-
Stefan-Boltzmann Radiation CalculatorCalculate thermal radiation power with the Stefan-Boltzmann law P = εσAT⁴. Enter emissivity, surface area and absolute temperature to get watts radiated.
-
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.
-
Resultant Force CalculatorCalculate the resultant of two forces acting at an angle using the parallelogram law. Get magnitude and direction in newtons instantly.
-
Two-Support Beam Reaction CalculatorCalculate support reactions R1 and R2 for a simply supported beam with a single point load using static equilibrium equations.
-
Average Acceleration CalculatorCalculate average acceleration from initial and final velocity over a time interval using a = Δv / Δt. Free, instant, with worked example.
-
Density CalculatorCalculate density from mass and volume using ρ = m / V. Get results in kg/m³ and g/cm³ instantly. Free, accurate physics density calculator.
-
Period and Frequency CalculatorConvert between period and frequency instantly. Compute T = 1/f or f = 1/T plus angular frequency for any wave or oscillation.
-
Impact Velocity from Drop Height CalculatorCalculate the impact velocity of an object dropped from a given height using v = √(2gh). Get speed in m/s, km/h and the fall time instantly.
-
Hydraulic Press Force CalculatorCalculate hydraulic press output force using Pascal's law. Enter input force and both piston areas to find F2 = F1 × (A2/A1) plus system pressure.
-
Weight to Mass CalculatorConvert weight (force in newtons) to mass in kilograms using m = W / g. Enter weight and gravitational acceleration to get mass instantly.
-
Torque from Moment of Inertia CalculatorCalculate the torque required to rotate an object using τ = I·α. Enter the moment of inertia and angular acceleration to get torque in N·m instantly.
-
Maximum Static Friction CalculatorCalculate the maximum static friction force from the coefficient of static friction and the normal force using F_s,max = μ_s · N. Free physics tool.
-
Work-Energy Theorem CalculatorCalculate net work done on an object using the work-energy theorem: W = ΔKE = ½m(vf²−vi²). Enter mass and initial/final velocities to get work in joules.
-
Motor Power CalculatorCalculate mechanical motor power from torque and RPM. P = T × 2π·RPM/60, with instant output in watts, kilowatts and horsepower.
-
Motor Torque CalculatorCalculate motor torque (N·m) from power in watts and speed in RPM using T = P / (2π·RPM/60). Free, instant electric & mechanical motor torque tool.
-
Stopping Distance from Friction CalculatorCalculate the stopping distance of a sliding object from its speed and friction coefficient using d = v²/(2·μ·g). Includes deceleration and stop time.
-
Rectangle Area Moment of Inertia CalculatorCalculate the area moment of inertia (Ix and Iy) of a rectangular cross-section about its centroidal axes from width and height.
-
Kinetic Friction Incline Acceleration CalculatorCalculate the acceleration of a block sliding down a rough incline from angle, kinetic friction coefficient, and gravity using a = g(sinθ − μcosθ).
-
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.
-
Continuity Equation Flow Rate CalculatorSolve the continuity equation A₁v₁ = A₂v₂ for fluid velocity and find volumetric flow rate Q = A·v in pipes and ducts instantly.
-
Atwood Machine CalculatorCalculate the acceleration and cord tension of an Atwood machine from two masses and gravity. Fast, accurate physics calculator with worked example.
-
Elastic Collision CalculatorCompute the final velocities of two objects after a 1D elastic collision from their masses and initial velocities. Conserves momentum and kinetic energy.
-
Coefficient of Restitution CalculatorCalculate the coefficient of restitution (e) from collision velocities or from drop and bounce heights. Free, instant physics calculator.
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.
