United States • dedicated calculator
Time Dilation and Length Contraction Calculator
Calculate Lorentz factor, dilated time, contracted length and relativistic energy from velocity as a fraction of light speed.
Specific inputs
live visual
transparent result
live visual
transparent result
1. EnterCalculator-specific values
2. ReviewUnits and assumptions
3. CalculateDedicated formula engine
4. VerifyResult, visual and guidance
Calculator inputs
Time Dilation and Length Contraction Calculator results
How the calculation works
γ = 1/√(1−β²), coordinate time = γ × proper time, and contracted length = proper length ÷ γ.
What to verify
Special-relativity formulas assume inertial frames and constant relative velocity.
How accurate is this calculator?
It is a transparent planning calculation based on the entered values and stated assumptions. Verify inputs and obtain professional or supplier confirmation where the decision is consequential.
Does it use U.S. defaults?
Yes. U.S. units, terminology, pricing conventions and rules are the primary defaults where location matters.
Is data sent to a server?
No. The calculation runs locally in the browser and does not send entered values to a remote calculation service.