Hi, you could use the Hackman and Oldham's Job Characteristic Model. They have a theory and a resultant formula to measure motivation. Please look it up.
Motivating Potential Score (MPS)
Using the five core job dimensions, you can score each job by its potential to motivate people. This is shown by the equation below:
MPS = (skill variety + Task Identity + Task Significance) X Autonomy X Feedback
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Divided by 3
From this equation, we can see that autonomy and feedback carry more weight than any of the first three job dimensions. For instance, a job can be low on skill variety and still have a reasonable MPS if autonomy or feedback are high. A job that's low on either autonomy or feedback, though, will be scored significantly lower.
There are other measures too such as the Herzberg Hygiene and Motivating factors, etc.
A psychometric test has to be used (preferably constructed) for the company, and then measures taken.
My company AQumen does the same. In case you are interested in testing, you can get in touch with me at 9823053064 or mail me at aqumen.nsk@gmail.com or director@aqumen.com.
Find attached details of my company.