Massa relativística
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The relativistic mass calculator is an online tool that calculates the mass of an object in motion relative to an observer. It uses the formula m = m₀·γ, where m₀ is the object's rest mass and γ is the Lorentz factor.
The Lorentz factor, γ, is calculated as 1 / sqrt(1 - v²/c²), where v is the object's velocity and c is the speed of light. The larger the object's velocity, the larger the value of γ and, consequently, the larger the relativistic mass.
This calculator is useful in situations where special relativity is important, such as in particle physics, astrophysics, and aerospace engineering. For example, it is possible to calculate the mass of a subatomic particle in motion in a particle accelerator.
Additionally, it is essential to be careful when using this calculator, as the Lorentz formula is only valid for velocities close to the speed of light. At lower velocities, the relativistic mass is approximately equal to the rest mass.
Frequently asked questions
What is relativistic mass?
Relativistic mass is the mass of an object in motion relative to an observer. It is calculated using the formula m = m₀·γ, where m₀ is the object's rest mass and γ is the Lorentz factor.
When should I use the relativistic mass calculator?
It should be used in situations where special relativity is important, such as in particle physics, astrophysics, and aerospace engineering.
What is the Lorentz factor?
The Lorentz factor, γ, is calculated as 1 / sqrt(1 - v²/c²), where v is the object's velocity and c is the speed of light.
Is the Lorentz formula valid for all velocities?
No, the Lorentz formula is only valid for velocities close to the speed of light. At lower velocities, the relativistic mass is approximately equal to the rest mass.
How can I calculate the mass of a subatomic particle in motion?
It can be calculated using the formula m = m₀·γ, where m₀ is the particle's rest mass and γ is the Lorentz factor.