Not sure what value you are seeking to determine and the level of accuracy you desire. I assume that you are seeking the present value of future benefits, which is an actuarial value based upon a specified annuity amount (the monthly promised benefit), an assumed interest rate, and a life expectancy based upon actuarial experience of the plan underwriter (e.g., an insurance company, union trust plan administrator, etc.) The interest and life expectancy assumptions are critical in long-term calculations. These may be assumed as suggested by other responses to your inquiry, however there may be significant differences as the pension plan actuaries have access to "actual" mortality data that more clearly reflect life expectancy (both longer and shorter), as well as the actual interest rates used in calculating benefits and normal plan costs.
You should receive an annual summary plan description from your employer or plan sponsor. This should provide more details about your benefits, including how to request information. Plans are usually required to file ERISA documents with the IRS and if your Human Resources/Plan Administrator cannot/will not provide the level of detail you want you can consider requesting info from the IRS.
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