How do I use Ohm's law?

Ohm's law states V = IR. If you know any two of voltage (V), current (I), or resistance (R), you can calculate the third.

What is the difference between speed and velocity?

Speed is a scalar quantity measuring how fast something moves. Velocity is a vector quantity that includes both speed and direction.

How do I calculate force?

Use Newton's second law: Force equals mass times acceleration (F = ma). Enter mass in kilograms and acceleration in m/s2 to get force in Newtons.

Science Calculators — Free Online Tools (2026)

Solve physics and chemistry problems with these science calculators. From basic kinematics to electrical circuits and chemical calculations, get quick and accurate results for homework, labs, and professional work.

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Ohm's Law Calculator — Voltage, Current & Resistance

Calculate voltage, current, or resistance using Ohm's Law V = IR.

Velocity Calculator — Free Online Physics Tool

Calculate velocity from distance and time or initial velocity plus acceleration instantly.

Acceleration Calculator — Free Online Physics Tool

Calculate acceleration from initial velocity, final velocity, and time instantly.

Force Calculator — Newton's Second Law Calculator Online

Calculate force using Newton's second law F = ma from mass and acceleration.

Density Calculator — Mass, Volume & Density Tool

Calculate density from mass and volume using the formula ρ = m/V.

Molecular Weight Calculator — Calculate Molar Mass Online

Calculate the molecular weight and elemental composition of any chemical compound from its formula.

How to Use These Tools Together

1
Calculate the velocity of an object given distance and time.
2
Determine acceleration from changes in velocity over time.
3
Calculate force using Newton's second law (F = ma) with mass and acceleration.
4
Find the density of a substance by dividing its mass by volume.

Key Terms Glossary

Ohm's Law: The relationship V = IR stating that voltage equals current multiplied by resistance in an electrical circuit.
Velocity: The rate of change of position with respect to time, including both speed and direction.
Acceleration: The rate of change of velocity with respect to time, measured in meters per second squared.
Force: An interaction that changes the motion of an object, measured in Newtons (N = kg times m/s2).
Density: Mass per unit volume of a substance, commonly expressed in grams per cubic centimeter or kg per cubic meter.
Molar Mass: The mass of one mole of a substance, expressed in grams per mole (g/mol).

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