Dear Vihasini,
You may refer to the following websites:
1.
www.jeassociates.com/eap/stress_inv.html - Homes and Rahe inventory is well known among psychological profesionals. But it may not be very relevant for measuring stress only.
2.
http://www.time-management-guide.com/assess-stress.html
I am not sure about the reliability and validity of the tool.
3. Occupational Stress Inventory-Revised (
http://www.sigmaassessmentsystems.co...ments/osir.asp) - This would be relevant for your purpose but may be a little costly.
Regards,
Deepti