Special Relativity Calculator (Time Dilation & Lorentz Factor)
Lorentz factor, time dilation, length contraction and relativistic mass-energy for a given velocity.
How to use the Special Relativity Calculator
- Enter or select: Velocity, Proper time Δt₀, Proper length L₀.
- The results (Lorentz factor γ, Dilated time Δt, Contracted length L, Velocity) are calculated instantly as you type.
- Use “Copy link” to share the calculation with the same input values.
Formula
- γ = 1/√(1 − v²/c²)
- Δt = γΔt₀
- L = L₀/γ