Enter the energy in joules:


The Energy to Mass Calculator is a web-based tool that allows users to calculate the mass of an object based on its energy content using Albert Einstein’s famous equation, E=mc^2. This equation, proposed by Einstein in 1905 as part of his theory of special relativity, establishes a fundamental connection between energy and mass. It states that the energy (E) of an object is equal to its mass (m) times the speed of light (c) squared, where c is approximately 299,792,458 meters per second.

Formula For Energy To Mass Calculator:

The formula used in this calculator is E=mc^2, where:

  • E represents energy (in joules)
  • m represents mass (in kilograms)
  • c represents the speed of light (approximately 299,792,458 m/s)

Working of the Energy to Mass Calculator:

Input Energy:

Users start by entering the energy value (E) in joules into the input field. The energy can represent any form of energy, such as kinetic energy, potential energy, or even rest energy.


Upon clicking the “Calculate Mass” button, thecalculateMass is triggered.

The function retrieves the energy value entered by the user.

It then utilizes Einstein’s equation, E=mc^2, to calculate the mass (m) of the object. The formula for mass is rearranged as m = E / (c^2), where c is the speed of light.

The calculated mass is rounded and displayed below the button.

Display Result:

The calculator displays the calculated mass of the object in kilograms.


The Energy to Mass Calculator simplifies the application of Einstein’s mass-energy equivalence principle, providing a quick and easy way to determine the mass of an object based on its energy content. This concept has profound implications in the realm of physics, as it highlights the interconversion of mass and energy, a fundamental principle that underpins our understanding of the universe. Users can use this calculator to explore the relationship between mass and energy in various physical scenarios.


The Energy to Mass Calculator is a user-friendly web tool that leverages Albert Einstein’s iconic equation, E=mc^2, to compute the mass of an object from its energy content. This equation, a cornerstone of Einstein’s theory of special relativity, demonstrates the profound link between mass (m), energy (E), and the speed of light (c).

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