Physics Calculator

Electricity/Electronics Calculator

Resistance

Resistance Calculator

Resistance is the opposition to current flow in an electric circuit, measured in ohms (Ω),...

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Electric Current

Electric Current Calculator

Electric current is the flow of electrons in one direction and is measured in amperes (A)....

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Voltage

Voltage Calculator

Voltage is the electric potential difference that moves charge through a circuit, measured...

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Electric Power Calculator

Electric Power Calculator

Electric power is energy per unit time, the product of voltage and current. Enter voltage ...

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Motion Calculator

Uniform Motion

Uniform Motion Calculator

Uniform motion is movement at a constant speed in a straight line. Use time and distance t...

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Acceleration Calculator

Acceleration Calculator

Acceleration is the change in velocity per unit time. Enter initial velocity, final veloci...

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Free Fall Calculator

Free Fall Calculator

Free fall is motion under gravity alone. Enter the drop height to get the fall time and im...

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General Mechanics Calculator

Kinetic Energy Calculator

Kinetic Energy Calculator

Kinetic energy is the energy of a moving object, proportional to mass times velocity squar...

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Potential Energy Calculator

Potential Energy Calculator

Potential energy is the energy an object has due to height, found by multiplying mass, gra...

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Density Calculator

Density Calculator

Density is mass per unit volume, found by dividing mass by volume.

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Force Calculator

Force Calculator

Using Newton's second law, enter mass and acceleration to find the required force (F = ma)...

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Pressure Calculator

Pressure Calculator

Enter force and area to calculate pressure, the force per unit area (P = F/A).

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Work & Power Calculator

Work & Power Calculator

Enter force, distance, and time to calculate work (W = Fd) and power (P = W/t).

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Wave Calculator

Wave Calculator

Enter frequency and wavelength to calculate wave speed (v = fλ).

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About This Category

The physics tools work in SI units without conversion tricks: metres, kilograms, seconds, newtons, joules and watts. Enter a speed in m/s and kinetic energy comes out in joules; enter a mass and the weight comes out in newtons at 9.81 m/s².

Pages are grouped by the question asked rather than by the school chapter. Motion covers speed, acceleration and free fall; forces and energy cover work, power and potential energy; electricity covers voltage, current, resistance and power; density, pressure and waves sit in the general section.

Frequently Asked Questions

Why does the calculator use 9.81 m/s² for gravity?

It is standard gravity at sea level and 45° latitude. Textbooks sometimes use 9.8 or 10 for simplicity, which moves a 10 m fall result by about 0.1 %. Keep the same value throughout one calculation.

Do the formulas account for air resistance and friction?

No. They are the idealised versions taught first, so a real fall is slower and a real braking distance longer. Treat the results as a best case, which is usually what planning needs.

Why is electrical power offered in several forms?

Because the useful form depends on what you know. P = VI when voltage and current are given, P = I²R when current and resistance are, and P = V²/R when only the supply voltage and resistance matter. All three describe the same quantity.

Sources & last update

2026-10-19