Relativistic Mechanics Calculator

Calculate time dilation, length contraction, relativistic mass, kinetic energy, and momentum from velocity as a fraction of the speed of light.

Velocity (fraction of c)

Proper Time

Proper Length

Rest Mass

Tab to move between fields

Lorentz Factor (γ)

2.29

Dilated Time

2.29 s

Contracted Length

0.44 m

Relativistic Mass2.29 kg

Kinetic Energy116,474,160,483,505,620 J

Total Energy206,474,160,483,505,630 J

How to Use This Calculator

Enter Velocity (fraction of c), Proper Time, and Proper Length.
Set Rest Mass.
Review Lorentz Factor (γ), Dilated Time (s), and Contracted Length (m).
Use Relativistic Mass (kg) and Kinetic Energy (J) to inform your decision.
Use the chart to visualize the results and explore different scenarios by adjusting inputs.

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