How to convert the energy in Joules to mass in a metric done

[bpollard]

any help would be appreciated. not sure where to start.

 

[Clever-Name]

What do you mean convert energy in joules to mass in a metric done? I don't understand that statement.

What sort of system are you dealing with? Are you just trying to get a rest-mass for something given it's energy?

You have to give us more information, otherwise we can't help

 

[bpollard]

sorry, you are right.
Let me try again, can you help me convert energy (in Joules) to a mass (metric Tons)
I can't figure out how to go about this.

 

[SammyS]

E = mc² , I suppose.

 

[Clever-Name]

It's also unclear what exactly you're dealing with.

Is this the energy of a moving object?

Or are you specifically looking for mass of an object which when completely converted into energy gives off a certain amount in Joules?

If it's the latter then you just use E = mc^{2} which will give you the mass in kg, then you just need to find how many kg are in a metric ton.