Retirement Calculator

Planning for Retirement

Retirement planning is the art of balancing how much you save during your working years against how much you will need to withdraw once you stop working. The key variables are your current savings, your monthly contribution, the return your investments earn, the age you plan to retire, the income you want in retirement, and the rate of inflation. This retirement calculator brings those pieces together to project how large your nest egg could grow by your target retirement age and to estimate how long that balance might last given the lifestyle you have in mind.

How the Projection Works

During your working years, the calculator grows your current savings and your ongoing contributions using compound growth, conceptually following A = P(1 + r/n)^(nt) for the lump sum plus the future value of each contribution. Once you reach your retirement age, the model switches to a withdrawal phase: it draws your desired income from the balance each year, lets the remaining balance keep earning a return, and increases the income you take to keep pace with inflation. The output shows your projected savings at retirement and how many years of income that pool can support before it is exhausted.

The Two Phases of Retirement Finance

Your financial life has two main phases. In the accumulation phase, while you are still working, the goal is to grow savings through steady contributions and investment returns, taking advantage of the long runway for compounding. In the distribution phase, in retirement, you draw down those savings while trying to make them last. A balance that looked ample on the day you retired must now cover decades of spending, which is why both your withdrawal rate and your continued investment return matter so much during this stage.

A Worked Example

Imagine a hypothetical saver who is 30 today, plans to retire at 65, and starts with $50,000 while adding $1,000 a month. Assuming a steady 7% return during the 35 working years, the balance has a long time to compound, and the bulk of the growth tends to arrive in the final stretch when the account is largest. If that saver wants the equivalent of $5,000 a month in retirement, the calculator inflates that income over time and tests how long the accumulated balance can sustain it. These numbers are illustrative only and are meant to show how the inputs interact, not to predict your result.

How Each Input Changes the Outcome

• Current age and retirement age: A longer gap between them means more years to contribute and compound, which usually has the single largest effect on your ending balance.
• Current savings: Money already invested has the longest time to grow, so a higher starting balance lifts the entire projection.
• Monthly contribution: Consistent saving is the lever you control most directly, and small increases compound into large gains over decades.
• Expected return: Because growth is exponential, even a modest change in this assumption can swing the result substantially.
• Inflation: A higher assumed inflation rate raises the future income you need and shortens how long savings last.
• Desired monthly income: The more you plan to withdraw, the faster the balance is drawn down in retirement.

Adjusting for Inflation

Inflation is often called the silent thief of retirement savings because it quietly erodes what your dollars can buy. Over long periods, even a moderate inflation rate can roughly halve purchasing power, so an income that feels comfortable today may fall short many years from now. This calculator accounts for that by increasing your desired income each year of retirement, giving you a more realistic picture of how long your savings will actually last rather than an overly optimistic one.

Tax-Advantaged Accounts and When to Use This Tool

In general terms, tax-advantaged retirement accounts let your investments grow with less annual tax drag, which can meaningfully improve long-run outcomes compared with saving the same amount in a fully taxable account. Some accounts offer an upfront tax benefit while others allow qualified withdrawals to be tax-free, and the right mix depends on your situation. This calculator does not model specific account types, contribution limits, or taxes, so treat its figures as a planning estimate. Use it for the big-picture question of whether your savings rate is on track; for modeling a single fixed rate or a shorter-term goal, the compound interest and savings calculators may be more appropriate.