The news media conditions us to think about our retirement savings need as a fixed number. At a recent graduation party someone told me they had $1.5MM saved for retirement,” and then came the big question: “Do you think that’s enough?” As a financial planner, this question Numbershas always perplexed me. With only that snippet of information, how in the world am I to know how much this person needs in retirement? The key is to know your “number” in the context of your goal-centric plan — not in terms of your demographic, neighbor or brother. So, let’s look at some factors that will affect your “number.”

1)     Your cost of living. This is first for a reason. If you don’t have this figured out, take the time to work on it. There are numerous online tools to help you with it. The tool I often recommend to clients is The point here is simple: If you are going to spend $200,000/year in retirement, your nest egg needs to be much bigger than if you are going to spend $100,000/year.

2)     Social Security. Just having this income stream will a lesser burden on your nest egg.  The question is: How much less? The maximum figure you can expect to receive in today’s dollars is around $30,000 per year. Get a personalized estimate here. You can begin taking this benefit as early as age 62, or as late as 70, depending on your unique set of circumstances.

3)     Other private and public pensions. Just like Social Security, these income sources will reduce the withdrawal burden or allow you to achieve a successful retirement period on a smaller nest egg. Pensions typically afford more flexibility than Social Security. One example is the single or joint life benefit option (read more on this from my colleague, Jeremy Burger, here). Another option is to take a lump sum. Your decisions on these options will have important implications for your retirement plan.

4)     Distribution rate and portfolio allocation. 4%  of your portfolio is generally considered to be a sustainable withdrawal rate. But what is your portfolio made of? A 60% equity, 40% bond allocation? How about 100% equity? Beyond that, how should you allocate the respective equity and bond components? These are important questions that you need to answer. Your advisor can help. One thing is for sure: With increasing longevity, you are going to need some long-term growth in the portfolio. And, since you will be distributing, you must shield your portfolio from the short-term volatility of the equity markets. The key is to find the perfect balance.

Having worked with hundreds of clients over the past several years, I can tell you that this is just the tip of the iceberg. Few people have the tools or know-how to coordinate all of this effectively, and one simple fact stated in the middle of a party is clearly not enough information to solve it all. If you’re not sure what your “number” is, be sure to ask an advisor for help.