# Physics calculators > Kinematics, forces, energy, momentum, electricity, waves, gravitation, thermodynamics. 20 calculators. HTML index: https://tttkmbb.com/physics · JSON: https://tttkmbb.com/api/v1/calculators?category=physics - [Speed, Distance & Time Calculator](https://tttkmbb.com/physics/speed-distance-time.md): Solves the uniform-motion relation speed = distance / time for whichever of the three quantities is omitted, and reports the speed in m/s, km/h and mph and the time as h:mm:ss. Tool: `solve_speed_distance_time`. - [Acceleration Calculator](https://tttkmbb.com/physics/acceleration.md): Computes average acceleration from initial velocity, final velocity and elapsed time, plus the velocity change, the distance covered assuming constant acceleration, and the acceleration expressed in g. Tool: `calculate_acceleration`. - [Force Calculator](https://tttkmbb.com/physics/newtons-second-law.md): Computes net force from mass and acceleration with Newton's second law, reported in newtons, kilonewtons and pounds-force, together with the object's weight under standard gravity. Tool: `calculate_force`. - [Kinetic Energy Calculator](https://tttkmbb.com/physics/kinetic-energy.md): Computes the translational kinetic energy of a moving mass from KE = ½·m·v², reported in joules, kilojoules, kilowatt-hours and kilocalories. Tool: `calculate_kinetic_energy`. - [Potential Energy Calculator](https://tttkmbb.com/physics/potential-energy.md): Computes the gravitational potential energy of a mass raised to a height near a planet's surface with PE = m·g·h (standard gravity by default), and the speed the mass would reach if it fell that height freely. Tool: `calculate_potential_energy`. - [Work & Power Calculator](https://tttkmbb.com/physics/work-power.md): Computes the mechanical work done by a constant force over a displacement, allowing for the angle between force and motion, and the average power when the duration is supplied. Tool: `calculate_work_and_power`. - [Momentum Calculator](https://tttkmbb.com/physics/momentum.md): Computes linear momentum from mass and velocity, the matching kinetic energy, and, when a stopping time is given, the average force needed to bring the object to rest (impulse–momentum theorem). Tool: `calculate_momentum`. - [Free Fall Calculator](https://tttkmbb.com/physics/free-fall.md): Computes the time to fall a given height from rest, or the height fallen in a given time, together with the final (impact) velocity, using h = ½·g·t² with no air resistance. Tool: `calculate_free_fall`. - [Projectile Motion Calculator](https://tttkmbb.com/physics/projectile-motion.md): Computes time of flight, horizontal range, maximum height and impact speed for a projectile launched at a given speed and angle from an optional initial height, ignoring air resistance (closed-form kinematics). Tool: `calculate_projectile_motion`. - [Ohm's Law Calculator](https://tttkmbb.com/physics/ohms-law.md): Solves Ohm's law V = I·R for whichever of voltage, current or resistance is omitted and reports the electrical power dissipated (P = V·I). Tool: `solve_ohms_law`. - [Electric Power Calculator](https://tttkmbb.com/physics/electric-power.md): Computes electrical power from voltage and current (or the current drawn by a known power at a given voltage), the equivalent resistance, and, with hours of use and a tariff, the energy in kWh and its cost. Tool: `calculate_electric_power`. - [Density Calculator](https://tttkmbb.com/physics/density-mass-volume.md): Solves ρ = m / V for whichever of density, mass or volume is omitted, and reports density in kg/m³ and g/cm³, volume in litres and cm³, and the specific gravity relative to water. Tool: `solve_density`. - [Pressure Calculator](https://tttkmbb.com/physics/pressure-force-area.md): Computes pressure as force divided by the area it acts on, and reports it in pascals, kilopascals, bar, pounds per square inch and standard atmospheres. Tool: `calculate_pressure`. - [Wavelength & Frequency Calculator](https://tttkmbb.com/physics/wavelength-frequency.md): Converts between wavelength and frequency for a wave of known propagation speed (default: the speed of light in vacuum) and, for electromagnetic waves in vacuum, reports the photon energy E = h·f in joules and electronvolts. Tool: `convert_wavelength_frequency`. - [Pendulum Period Calculator](https://tttkmbb.com/physics/pendulum.md): Computes the period, frequency and angular frequency of a simple pendulum from its length with the small-angle formula T = 2π√(L/g); when an amplitude is given it also returns the exact period from the arithmetic–geometric mean. Tool: `calculate_pendulum_period`. - [Hooke's Law Calculator](https://tttkmbb.com/physics/hookes-law.md): Computes the restoring force of a linear spring and the elastic potential energy stored at a given displacement, plus the natural period and frequency of a mass on that spring when a mass is supplied. Tool: `calculate_hookes_law`. - [Gravitational Force Calculator](https://tttkmbb.com/physics/gravitational-force.md): Computes the attractive gravitational force between two point or spherically symmetric masses at a given centre-to-centre distance with Newton's law and the CODATA 2018 value of G, plus the acceleration each mass experiences. Tool: `calculate_gravitational_force`. - [Centripetal Force Calculator](https://tttkmbb.com/physics/centripetal-force.md): Computes the centripetal (centre-seeking) force and acceleration needed to keep a mass moving in a circle of given radius at a given speed, plus the angular velocity, rotation period and rpm. Tool: `calculate_centripetal_force`. - [Specific Heat Calculator](https://tttkmbb.com/physics/specific-heat.md): Computes the heat energy needed to change the temperature of a mass of material by a given amount from Q = m·c·ΔT, using the specific heat capacity of liquid water (4186 J/(kg·K)) by default. Tool: `calculate_specific_heat_energy`. - [Resistors in Series and Parallel Calculator](https://tttkmbb.com/physics/resistors-series-parallel.md): Computes the equivalent resistance of a list of resistors connected all in series (sum) and all in parallel (reciprocal of the sum of reciprocals), plus the parallel conductance. Tool: `calculate_resistors_series_parallel`.