EVA(economic value added) is a measurement of financial performance.
The concept of EVA was introduced because old measurement of ROA(net profit/asset or investment) was not efficient enough to measure financial performance.
Take a simple example:
Project A: investment needed: $100m,
expected net profit $10m,
Roa of project A is 10%.
Project B: investment: $10,000
Expected net profit $2000
Roa=2000/10,000=20%
If ROA is taken as a measurement, project B would be much better than project A.
In this case, if sufficient money is on hand, project A would be better than B.
Therefore, Roa here doesn't work properly.
EVA then was introduced as a measurement of financial performance.
The formula for EVA is
EVA=(ROA - weighted average cost of capital)* total capital
From the formula, it is clear that eva is a dollar value which is different from Roa( Roa is a percentage number).
Good luck in your study, soko.