Kinetic energy calculator
For motion energy from mass and speed; speed is squared.
51 tools
Physics calculators
School and workshop physics: force from mass and acceleration, energy, work, power and other models. Inverse calculations are available only for the quantities offered by each tool’s modes. Use the units shown beside the fields, including available non-SI options; conversion is performed where provided. When a model uses g₀ = 9.80665 m/s², this is the chosen standard value, not measured local gravity.
All in section
All calculators Physics calculators
Acceleration calculator
Acceleration from a change in velocity over time, or final velocity from acceleration.
Open
Physics calculators
Air density calculator
Density of moist air from temperature, pressure and humidity.
Open
Physics calculators
Air pressure at altitude calculator
Atmospheric pressure, temperature and air density at a given altitude.
Open
Physics calculators
Bernoulli equation calculator
Pressure at the second section of a flow from speeds and heights, with the total head.
Open
Physics calculators New
Boiling point calculator
The boiling point of water at a given altitude above sea level.
Open
Physics calculators
Buoyant force calculator
Archimedes' force, the body's weight, and whether it floats.
Open
Physics calculators
Carnot efficiency calculator
The ceiling efficiency of a heat engine from two temperatures.
Open
Physics calculators
Centripetal force calculator
Centripetal force, acceleration, angular velocity and period of revolution.
Open
Physics calculators
Coulomb's law calculator
The force between two point charges.
Open
Physics calculators
De Broglie wavelength calculator
The wavelength of a particle from its mass and speed.
Open
Physics calculators
Decibel calculator
Add noise levels and convert a ratio of quantities into decibels.
Open
Physics calculators
Density calculator
Density, mass or volume of a substance from ρ = m ÷ V.
Open
Physics calculators
Dew point calculator
The temperature at which air of this humidity starts giving up moisture.
Open
Physics calculators
Doppler effect calculator
The heard frequency when the source or the listener moves.
Open
Physics calculators
Escape velocity calculator
The speed needed to leave a planet, from its mass and radius.
Open
Physics calculators
Free fall calculator
Impact speed and fall time from a height or from a duration.
Open
Physics calculators
Gravitational force calculator
Attraction between two bodies from the law of universal gravitation.
Open
Physics calculators
Half-life calculator
Remaining amount from a half-life, or the time to reach a given remainder.
Open
Physics calculators
Heat index calculator
An illustrative heat index from the unadjusted regression.
Open
Physics calculators
Hooke's law calculator
Spring force, extension or rate, plus the energy stored.
Open
Physics calculators
Absolute humidity calculator
How many grams of water are in a cubic metre of air.
Open
Physics calculators
Hydrostatic pressure calculator
Pressure of a liquid column from density and depth.
Open
Physics calculators
Inclined plane calculator
Force along the slope, friction and acceleration.
Open
Physics calculators
Inverse square law calculator
How intensity falls with distance from a point source.
Open
Physics calculators
Kinetic energy calculator
Kinetic energy, speed or mass from E = ½mv².
Open
Physics calculators
Lever and mechanical advantage calculator
Lever balance: the force on the second arm and the advantage gained.
Open
Physics calculators
Mach number calculator
Mach number from speed and air temperature, with the flight regime named.
Open
Physics calculators
Mass-energy equivalence calculator
Rest energy of a mass from E=mc² in joules, kilowatt-hours and tonnes of TNT.
Open
Physics calculators
Moment of inertia calculator
Moment of inertia of a rod, disk, ring or sphere about an axis.
Open
Physics calculators
Momentum calculator
Signed momentum, mass or velocity from p = m · v.
Open
Physics calculators
Newton's second law calculator
Force, mass or acceleration from F = m · a.
Open
Physics calculators
Orbital period calculator
Orbital period from the central body mass and the orbit radius.
Open
Physics calculators
Pendulum period calculator
Period of a simple pendulum from its length.
Open
Physics calculators
Photon energy calculator
Photon energy and frequency from wavelength.
Open
Physics calculators
Mechanical power calculator
Power, work or time from P = W ÷ t.
Open
Physics calculators
Torque calculator
Torque magnitude from force, application-point distance and angle.
Open
Physics calculators
Pipe flow velocity calculator
Water velocity in a pipe from flow rate and inner diameter.
Open
Physics calculators
Potential energy calculator
Potential energy, height or mass from E = mgh.
Open
Physics calculators
Pressure calculator
Pressure, force or area from p = F ÷ A.
Open
Physics calculators
Projectile motion calculator
Range, flight time and apex height of a body thrown at an angle.
Open
Physics calculators
Time dilation calculator
Lorentz factor, time dilation and length contraction.
Open
Physics calculators
Specific heat calculator
How much energy it takes to heat a body: Q = c·m·ΔT.
Open
Physics calculators
Speed of sound calculator
The speed of sound in air from temperature, with a conversion to kilometres per hour.
Open
Physics calculators
Stress, strain and Young's modulus calculator
Stress, strain and Young's modulus for a specimen in tension.
Open
Physics calculators
Terminal velocity calculator
Terminal velocity in air with the time and distance needed to reach it.
Open
Physics calculators
Thermal conduction calculator
Heat flow, thermal resistance and U-value of a single layer.
Open
Physics calculators
Thin lens calculator
Image distance, magnification and image type from the thin lens equation.
Open
Physics calculators
Wavelength and frequency calculator
Relates wave speed, frequency and wavelength in any direction.
Open
Physics calculators
Wind chill calculator
How much colder frost feels in wind — by the meteorological services' formula.
Open
Physics calculators
Wind power calculator
Power in the wind and the power a rotor can extract, against the Betz limit.
Open
Physics calculators
Work calculator
Work done by a force over a distance, including the angle between them.
Open
Which calculation to choose
Potential energy calculator
For a lifted load’s energy change from vertical height and constant g.
What to prepare
Convert mass to kilograms, speed to metres per second and height to metres. Choose a zero level for height.
Common mistake
Mass is not gravitational force. These energies describe different conditions; energy alone does not give braking distance.
Popular calculators
New calculators
FAQ
Why 9.80665 and not 9.8?
9.80665 m/s² is the chosen standard g₀, not the exact measured local gravity everywhere. 9.8 approximates it. The change in the displayed result depends on the formula, inputs and rounding, not a fixed decimal place.
Can I solve in any direction?
Only for quantities that the particular tool offers as modes. Newton’s second law has several directions; rest energy and the distance law have their own specified outputs. There is no universal inverse solver for every formula.
Are friction and air resistance included?
It depends on the model. Some tools omit them, while the inclined plane uses an entered friction coefficient and terminal velocity uses a separate drag model with constant parameters. This is not a general simulation of every loss force.
Which units should I use?
Use the units shown beside each field. These may include °C, degrees, percentages or km/h; where provided, the calculator converts them to consistent formula units. It cannot detect a number entered in the wrong unit.
Categories
Finance
Loan, mortgage, compound interest, percentage and discount calculators for everyday money decisions.
Currency
Currency converter and popular pairs for quick travel, shopping and budget estimates.
Fitness
BMI, calories, running pace and one-rep max calculators for training and body metrics.
Home improvement
Tile, wallpaper, paint and laminate calculators for estimating materials before a project.
Date and time
Age and business day calculators for dates, planning and deadlines.
Maths calculators
Remainder, prime factors, proportions, equations and logarithms.
Business and marketing
Contribution margin, customer acquisition cost, average order value, returns and ad ROI.
Unit converters
Convert length, mass, temperature, pressure and other quantities between units.
Electronics calculators
Current, voltage, resistance, power and circuit supply.
Computer calculators
Download speed, bandwidth, frames, resolution and disk space.
Study calculators
Test percentages, the grade you need and reading speed.
Car calculators
Fuel consumption, power to weight, trip cost and speed.
Household calculators
Electricity use, tips and filling a pool.
Geometry calculators
Area, perimeter, volume and surface of flat and solid shapes.
Chemistry calculators
Concentration, moles, dilution, pH and the ideal gas law.