Retirement Savings Calculator

A retirement savings calculator estimates how much your portfolio could grow before retirement based on your age, current savings, monthly contributions, and expected return. It also compares that balance with an income-based nest egg target so you can quickly see whether your plan is on track, behind, or ahead.

A retirement savings calculator is a planning tool that estimates the future value of your retirement accounts using your current balance, recurring contributions, expected investment return, and years until retirement. Instead of looking only at today's account balance, it shows how ongoing saving and compounding may build a much larger nest egg over time. That makes it easier to translate a vague goal like “save more for retirement” into numbers you can actually evaluate.

Most people use a retirement savings calculator to answer practical questions: How much could I have by age 65 or 67? Will my current savings rate support the income I want later? How much more do I need to contribute if I started late? A strong retirement savings calculator helps by combining portfolio growth with a target based on future income needs, so you are not just projecting a balance in isolation. That comparison is what turns the result into a real planning decision.

In real-world use, a retirement savings calculator is helpful when adjusting 401(k) deferrals, IRA contributions, brokerage saving, or a planned retirement age. You can compare retiring earlier versus later, test a more conservative return assumption, or see the impact of increasing monthly contributions after a raise. Because a retirement savings calculator separates your own contributions from investment growth, it also shows the value of starting early and staying consistent. The numbers are still projections, but they give you a much clearer baseline for retirement planning than guesswork alone.

1. Enter your current age and target retirement age to set the planning timeline.
2. Add your current retirement savings balance so the calculator starts from your real portfolio value today.
3. Enter the amount you expect to contribute each month across accounts such as a 401(k), IRA, or brokerage account.
4. Type your expected annual return, current income, and the percentage of income you want to replace in retirement.
5. Choose a withdrawal rate to estimate how much annual income your future balance may reasonably support.
6. Click Calculate to view projected balance, nest egg target, expected retirement income, and any funding gap or surplus.

Retirement balance = S(1 + i)^m + C[((1 + i)^m - 1) / i]

• `S` is your current retirement savings.
• `C` is the monthly contribution.
• `i` is the monthly growth rate and `m` is total months until retirement.
• Target nest egg = desired annual retirement income divided by withdrawal rate.

Projected Retirement Balance

This is the estimated value of your retirement portfolio at your chosen retirement age after current savings, monthly contributions, and compound growth are applied.

Target Nest Egg

The target nest egg is the estimated portfolio size needed to support your desired retirement income based on the withdrawal rate you selected.

Funding Gap or Surplus

This compares your projected balance with the target nest egg. A negative number means your current assumptions may fall short of your income goal.

Estimated Monthly Retirement Income

This metric converts the projected balance into an estimated monthly income using your withdrawal rate, giving you a more practical spending view.

Investment Growth

Investment growth is the portion of your projected retirement balance that comes from returns rather than from money you personally contributed.

Assume these inputs:

• Current age: 35
• Retirement age: 67
• Current savings: $50,000
• Monthly contribution: $600
• Expected annual return: 7%
• Current income: $90,000 with an 80% replacement target and 4% withdrawal rate

First, the calculator measures a 32-year saving window, or 384 months. It compounds the existing $50,000 balance across that timeline, then adds the future value of 384 monthly contributions of $600. It also sets a retirement income goal of $72,000 per year, which implies a target nest egg of $1.8 million when divided by a 4% withdrawal rate.

With these assumptions, the projected retirement balance is about $1.29 million. That could support roughly $4,300 per month, but it would still be below the $1.8 million target by about $510,000. The outcome suggests the plan is moving in the right direction, yet higher contributions, a later retirement age, or a lower income target may be needed to fully close the gap.