Fidelity's rule of thumb is that you need 8x your ending salary for retirement. You'd be able to reduce that to 8x your ending salary minus your annual pension benefit.
However, that's based on the rule of thumb that you need less income in retirement. 85% of your ending income is a common figure. Personally, I think that's way low. With all the free time I'll have in retirement and our love of travel, I want access to more money than we make now.
We have Roth 401k's, which means that the money is tax-free for us at retirement. Still, we're targeting ~20x our current salary (which will probably be ~15x our ending salary). What we're doing to get there is saving extremely aggressively (maxing both Roth 401k's and putting money into a taxable investment account) until we have enough to let it go on autopilot. Then we'll cut our contributions down to the minimum required to get the maximum company match and spend like there is no tomorrow.
Might want to read this on 401 (k's) before you retire.