Enter the value in** J (Joules):**

## From energy (in J) to kilograms

If the energy of an object at rest is measured in Joules, then the mass of the object according to Einstein’s formula in kilograms is equal to:

^{-17}kg

## From the work of moving an object in Joules (J) to kilograms

If the work of moving an object is measured in Joules, then additional data must be entered:

Enter the displacement of the object in **m (meters)**:

Enter the acceleration of the object in **m/s ^{2}** (

**meters per second squared**):

*(Note: if the body falls freely, then the acceleration of gravity g = 9.80665 m / s ^{2})*

As a result of the calculation, the mass of the object in kilograms is:

## How to convert from J to kg?

* Joule (J)* is a unit of measure for work in motion, energy, or amount of heat

* Kilogram (kg)* is a unit of measure for mass

If energy is measured in Joules, then the mass can be found by the formula from Einstein’s equation E = mc²:

* m = E / с^{2}*, where

* m* is the mass of the object in kilograms (kg);

* E* is the total energy of the resting physical object in Joules;

* c* is the speed of light in vacuum (c = 299 792 458 m / s).

If the work of moving an object is measured in Joules, then the mass can be found by the formula:

m = A / (a * s), where

* m* is the mass of the object in kilograms (kg);

* A* is the work done when the object is moved in Joules (J);

* a* is the acceleration of an object in m / s

^{2}(meters per second squared) (acceleration due to gravity 9.80665 m / s

^{2});

* s* is the movement of the object in m (meters).