Return on Investment (ROI) can be calculated as a percentage. The following is a simple formula used to determine the ROI:

[(Monetary Benefits ? Costs of Training) / Costs of Training] x 100 = ROI %

OR

Use an online calculator:
Training.com
Avatech Solutions
Internet University
Mindleader

The ROI value indicates the percentage of return from the invested capital. An ROI of 0 indicates that the costs invested in training is equal the benefit from the training. It?s up to your organization to determine what is an appropriate ROI.