Hi,
You may be able to calculate your CTC from your salary slip only if all the components of your salary reflect on it. Usually salary components such as Medical Reimbursement and LTA do not reflect on the slip as they need to be claimed. (Your company may have Medical Allowance, instead of Reimbursement, which is shown on salary slip).
A point also to be noted is that the Employer PF contribution is added to the salary and this figure is called the CTC. The Employer PF may be 12% of actual Basic, or limited to 12% of INR 6500/-
Hence, please understand that there is no simple formula that can be provided to you for you to be able to calculate your CTC basis the salary slip.
Solution:
1. The Basic Salary is usually a certain percentage of the CTC. Contact a colleague in the past organization and ask her/him to get in touch with the HR and find out the percentage and then back calculate your CTC.
2. Contact the HR in your past organization yourself and ask them what your CTC was!
Regards,
Neeraj K Singh