Retirement Calculator

How this result is built

Project a retirement balance and compare it with the nest egg a spending plan would need.

The balance at retirement is compound growth on what you have saved and what you add until you stop working. The nest egg beside it is annual spending divided by the withdrawal rate. If the balance is below the nest egg, the gap is the planning problem, in dollars.

What the opening example is for

A 4% withdrawal rate is a starting point from historical research, not a guarantee that a portfolio survives every future. Social Security and pensions, if you have them, can cover part of the spending so the portfolio does not have to.

The walkthrough below uses the numbers already sitting in Retirement Calculator. Press Calculate and the headline should match this page. Then put your own figures in. The math does not run until you press the button, and Clear hides the result.

What each field is doing

The “Current age” line on Retirement Calculator starts at 35. If the label is a rate, type the annual figure the contract uses. If it is money, type the amount that will actually move, not a rounded hope.

Retirement Calculator treats “Retirement age” as its own entry, and the form opens with 65. Leave that figure only when it matches the statement, the quote, or the plan you are testing. Press Calculate after the edit so the chart and the schedule move with it.

Before you replace it, “Saved so far” reads $40,000.00 on Retirement Calculator. A round example is useful for learning the page. It is a poor substitute for the number on your own paperwork, so replace it and run the form again.

Look at “Monthly contribution” first if you are checking Retirement Calculator: the filled value is $500.00. The other fields stay put while you change this one. That is the clean way to see what this line is doing inside the result.

The remaining fields

The “Annual return before retirement” line on Retirement Calculator starts at 7%. If the label is a rate, type the annual figure the contract uses. If it is money, type the amount that will actually move, not a rounded hope.

Retirement Calculator treats “Monthly spending in retirement” as its own entry, and the form opens with $4,000.00. Leave that figure only when it matches the statement, the quote, or the plan you are testing. Press Calculate after the edit so the chart and the schedule move with it.

Before you replace it, “Withdrawal rate” reads 4% on Retirement Calculator. A round example is useful for learning the page. It is a poor substitute for the number on your own paperwork, so replace it and run the form again.

The opening result, line by line

Press Calculate on the opening form and Balance at retirement is $934,645.40. That is the number the rest of this section is talking about.

Nest egg for that spending is $1,200,000.00 when you run the opening figures on Retirement Calculator. That line is part of the same calculation as the headline. It is not a second balance you can spend on top of the result. Change one input and press Calculate if you want to see whether this line moves.

On this opening pass, gap is $265,354.60. That line is part of the same calculation as the headline. It is not a second balance you can spend on top of the result. Change one input and press Calculate if you want to see whether this line moves.

Retirement Calculator reports that contributed is $220,000.00. That line is part of the same calculation as the headline. It is not a second balance you can spend on top of the result. Change one input and press Calculate if you want to see whether this line moves.

How those lines were produced

Years to save is 30 when you run the opening figures on Retirement Calculator. That line is part of the same calculation as the headline. It is not a second balance you can spend on top of the result. Change one input and press Calculate if you want to see whether this line moves.

The nest egg divides annual spending by the withdrawal rate. It is a starting point, not a guarantee that the money lasts.

A second pass changes only “Current age”, from 35 to 38.50. Balance at retirement moves from $934,645.40 to $713,494.56. Nothing else on the form was edited, so the gap between those two results is the effect of that one field on Retirement Calculator. If the gap is tiny, this page is not very sensitive to that entry. If the gap is large, get that entry from a document before you plan around the result.

What this page will not claim

Retirement Calculator follows the contribution, the return, and the years you enter. It does not look up your income, a workplace-plan phase-out, or a custodian balance. The 2026 limits named on this desk are ceilings, not instructions to contribute the maximum.

Retirement Calculator stops at its own formula. When the next question is different, open 401(k) Calculator (Your deferral, the match, and the 2026 cap.); FIRE Calculator (The portfolio that covers spending at your withdrawal rate.); Roth IRA Calculator (After-tax contributions, tax-free qualified growth.). Do not add those results to this one as if they were the same kind of dollar.

Check the result before you use it

Start on Retirement Calculator by reading the labels, not the headline. The opening labels are Current age (35), Retirement age (65), Saved so far ($40,000.00), Monthly contribution ($500.00), Annual return before retirement (7%), Monthly spending in retirement ($4,000.00), Withdrawal rate (4%). If a label is not the fact you have, the result cannot turn into that fact later. The illustration on the form lands on $934,645.40. When you press Calculate and see that same figure, the button and this explanation are using one formula.

Change one field at a time. Write down the headline, edit a single line, and press Calculate again. A large jump means that line carries the result. A line that does not move is a line the formula ignores, which is a reason to confirm you opened the right page. Retirement Calculator is built for one job: Savings at retirement, next to the nest egg spending implies. The description on the page says the same thing in a sentence: Project a retirement balance and compare it with the nest egg a spending plan would need.

When the paperwork disagrees

Then hold the headline next to a source outside the site. That source might be a loan estimate, an account statement, a pay stub, or the public limit named in the methodology. A few cents of difference on a long schedule is ordinary rounding. A different rate, a fee you never typed, or a tax the form does not ask for is not rounding. Correct the input. Do not average the page with the paperwork.

When the outside source still disagrees, Retirement Calculator has reached the edge of what it will claim. It will not phone a lender, pull a county record, or apply a credit you left blank. Send the calculator name, every input, and the result you expected through the contact page if you think the formula itself is wrong. Until that is settled, read $934,645.40 as the output of the fields above and nothing else.

FAQs