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48 Calculators

Physics Calculators

Uniformly Accelerated Motion Calculator: Kinematics and Free Fall

Kinematic equations: v = v₀ + at, s = v₀t + at²/2, acceleration and time, free fall and vertical throw.

Ohm's Law Calculator: Current, Voltage, Resistance, Power

Ohm's law I = V / R: find current, voltage, resistance and power P = V · I = I²R = V²/R with unit conversion and a solution.

Kinetic and Potential Energy Calculator

Energy calculator: kinetic E = mv²/2 and potential E = mgh, plus speed, mass and height from energy, with a solution.

Power Calculator: Work, Time, Force, Speed

Power P = W / t and P = F · v: find power, work, time, force or speed with conversion of kW, hp and kWh and a solution.

Half-Life Calculator: Radioactive Decay

Radioactive decay N = N₀·2^(−t/T): amount remaining, decay time and half-life.

Gas Laws Calculator: Ideal Gas Law and Combined Gas Law

Ideal gas law pV = nRT and the combined gas law: pressure, volume, temperature and special processes.

Newton's Second Law Calculator: Force, Mass, Acceleration

Newton's second law F = m · a: find force, mass or acceleration with unit conversion and a step-by-step solution.

Speed, Distance and Time Calculator

Find speed, distance or time with v = s / t, unit conversion (km/h, m/s, minutes, hours) and a step-by-step solution.

Density Calculator: Density, Mass, Volume

Density ρ = m / V, mass and volume with unit conversion (g/cm³, liters, grams), a solution and substance lookup by density.

Efficiency, Lever and Inclined Plane Calculator

Efficiency η = W_out / W_in, useful work and work input, torque, the lever rule and inclined plane efficiency.

Hooke's Law Calculator: Spring Force and Constant

Hooke's law F = kx: spring force, spring constant, extension and elastic potential energy.

Pendulum Period and Wavelength Calculator

Period of a simple pendulum and a mass on a spring, pendulum length, frequency and wavelength.

Thin Lens Calculator: Focal Length and Magnification

Thin lens equation 1/F = 1/d + 1/f: image distance, focal length, optical power, magnification and image properties.

Weight on Other Planets Calculator

How much you would weigh on the Moon, Mars, Jupiter and other planets: weight P = m · g and scale readings for all Solar System bodies.

Resistors in Series and Parallel Calculator

Total resistance of resistors in series, parallel and combination circuits, with the current and voltage of each resistor.

Momentum Calculator: Conservation of Momentum and Collisions

Momentum p = mv and its conservation: inelastic and elastic collisions, recoil and impulse.

Heat Calculator: Q = mcΔT, Melting, Combustion

Heat for heating and cooling, melting, boiling and burning fuel, and the heat balance of a mixture, with tables of substances.

Pressure Calculator: p = F/A and Fluid Pressure

Pressure of solids and fluids: p = F/A, p = ρgh, force, area and depth with a step-by-step solution and unit conversion.

Buoyant Force Calculator (Archimedes' Principle)

Buoyant force F = ρgV, submerged volume, fluid density, and whether an object floats or sinks.

Electric Work, Power and Electricity Cost Calculator

Work done by current W = VIt, power P = VI, energy in kWh and the cost of electricity at your rate.

Coulomb's Law Calculator: Electric Force

Force between point charges F = k|q₁||q₂|/r², distance, charge and electric field strength.

Gravitational Force Calculator (Newton's Law of Gravitation)

Gravitational force F = Gm₁m₂/r², distance, mass and the surface gravity of a planet.

Resistor Color Code Calculator: 4 and 5 Bands

Find resistance from color bands and bands from a value, with a picture and tolerance.

Voltage Drop Calculator for Copper and Aluminium Wire

Voltage drop and power loss in copper and aluminium wire from length, cross-section and current.

Horsepower Calculator: kW, Torque and Engine Power

Convert hp and kW, find power from torque and RPM, and estimate engine power from a quarter-mile run.

Water Density Calculator: Fresh and Salt Water

The density of fresh and salt water from temperature and salinity.

Speed of Sound in Air Calculator by Temperature

The speed of sound in dry air from the temperature, with the solution.

Coefficient of Friction Calculator: Friction and Normal Force

The coefficient of friction, friction force and normal force, and the coefficient from a slope angle.

Ball Flight with Air Drag Calculator

The range, height and flight time of a ball with air drag, with a plot of the path.

Kepler's Third Law Calculator

Orbital period from the semi-major axis and back, comparing orbits, and satellite periods by Kepler's third law.

Atomic Structure and Electron Configuration Calculator

Protons, neutrons and electrons, electron configuration, shells and orbital diagram of any element or ion.

Scientific Notation Converter: a · 10ⁿ and Back

Convert a number to scientific notation and back: 0.00052 = 5.2 · 10⁻⁴. Step-by-step solution.

Wavelength and Frequency Converter: nm, m, Hz, eV

Wavelength and frequency converter: nanometers, meters, hertz and photon energy. Conversion with a solution and a table.

Electrical Units Converter: Amperes, Volts, Ohms, Farads

Electrical units converter: current, voltage, resistance and capacitance. Convert mA, kV, kΩ and µF with a solution.

Frequency and Period Converter: Hz, rpm, Seconds

Frequency and period converter: Hz, kHz, MHz, rpm, rad/s and period in seconds. Conversion with a solution and a table.

Pressure Converter: Pa, kPa, atm, bar, mmHg

Pressure converter: pascals, kPa, MPa, bars, atmospheres, mmHg. Exact conversion with a solution and a table.

Energy Converter: Joules, Calories, kWh, eV

Energy converter: J, kJ, calories, kilocalories, kWh and electronvolts. Conversion with a solution and a table.

Force Converter: Newtons, kgf, Dynes, lbf

Force converter: N, kN, MN, dynes, kgf and pound-force. Exact conversion with a solution and a table.

Power Converter: Watts, Kilowatts, Horsepower

Power converter: W, kW, MW and horsepower. Conversion with a solution and a table.

Density Converter: kg/m³, g/cm³, g/L

Density converter: kg/m³, g/cm³, g/L, g/mL and t/m³. Exact conversion with a solution and a table.

Acceleration Converter: m/s², cm/s², g

Acceleration converter: m/s², cm/s², km/h per second and g. Exact conversion with a solution and a table.

SI Prefix Converter: Nano, Micro, Milli, Kilo, Mega

SI prefix converter from yocto to yotta. Convert between nano-, micro-, milli-, kilo- and mega- with a solution and a table.

Radiation Units Converter: Bq, Ci, Gy, Sv, R

Radiation units converter: becquerels, curies, grays, rads, sieverts, rems and roentgens. Conversion with a solution.

Density of Substances

Density of solids, liquids and gases in kg/m³.

Specific Heat Capacity Table

Specific heat capacity of substances in J/(kg·°C).

Melting and Boiling Table

Melting and boiling points, specific latent heat of fusion and of vaporization.

Electrical Resistivity Table

Electrical resistivity of conductors at 20 °C in Ω·mm²/m.

Physical Constants Table

The main physical constants: speed of light, electron charge, Avogadro constant and others.

Temperature Coefficient of Resistance

Values of α for metals and alloys.

Magnetic Units Converter: Flux Density, Flux, Inductance

Flux density, field strength, magnetomotive force, magnetic flux and inductance.

Light Units Converter: Intensity, Illuminance, Exitance

Luminous intensity, illuminance, exitance, luminous flux and luminous energy.

Flow Rate Converter: Volumetric and Mass Flow

Units of volumetric and mass flow of liquids and gases.

Viscosity Converter: Kinematic and Dynamic

Units of kinematic and dynamic viscosity: stokes, centistokes, poise.

Torque Converter: N·m, kgf·m, lbf·ft

Units of torque in the metric and imperial systems.

Physics calculators solve school problems the way they are written in a notebook: given, conversion to SI, formula, substitution and answer. Enter quantities in any units and the calculator converts them to SI.