Retirement Calculator

Retirement planning really comes down to one question, will I have enough?, wrapped in a fog of compound interest. This free retirement calculator cuts through it: enter your age, target retirement age, current savings, monthly contributions and expected return, and it shows your projected nest egg, how much is growth versus your own contributions, what it is worth in today’s money, and the monthly income the 4% rule says it could sustain. It projects your nest egg from 401(k) and IRA contributions with compound growth, applies inflation adjustments, and tests a safe withdrawal rate, using the classic 4% rule as a benchmark.

Related reading: Guide: how compound interest grows your money

Last updated: October 22, 2026

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The formula

  • Years to retirement = retirement age − current age
  • Future value of savings = savings × (1 + r/12)^months
  • Future value of contributions = PMT × (((1 + r/12)^months − 1) ÷ (r/12))
  • Nest egg = future value of savings + future value of contributions
  • Sustainable monthly income = nest egg × 4% ÷ 12 (the 4% rule)

A worked example

Take a 30 year old with $25,000 saved, adding $500 a month at a 7% annual return: by 65 the math says about $1,188,000. Of that, $235,000 is contributions and roughly $953,000 is investment growth, worth about $500,700 in today’s money at 2.5% inflation.

More about the Retirement Calculator

Compounding: why starting early wins

Watch compounding do the heavy lifting, with real numbers. A 30 year old with $25,000 saved, adding $500 a month at a 7% annual return, is looking at about $1,188,000 by 65. Only $235,000 of that is contributions; roughly $953,000 is pure growth. In today’s money at 2.5% inflation that’s about $500,700, and the 4% rule turns it into roughly $3,960 a month of sustainable income. The $500-a-month habit did the heavy lifting; time just multiplied it.

Your levers, roughly in order of power: starting early, nothing beats it. A 25 year old contributing $300 a month ends up ahead of a 35 year old contributing $500. Then the amount you put in each month, the lever you control most directly. Then your return assumption: 7% is the classic long run stock figure, or 5% for a more conservative plan. And retirement age, each extra working year works twice over, adding contributions and cutting withdrawal years. Play with each one above and watch the projection move.

Assumptions to stress test and catch up moves

Three moves that matter more than any single number. Capture the full employer match before anything else, it’s the only guaranteed 50 to 100% return in finance. Raise your contributions with every pay rise; you won’t miss money you never saw. Keep fees low: a 1% annual fee quietly eats roughly a quarter of your returns over 40 years. And revisit the projection every year, life changes the inputs, so the plan should change too.

One honest caveat: the projection assumes a constant annual return, constant contributions, and inflation at your chosen rate. Real markets lurch, and it doesn’t model taxes, fees, career breaks or market crashes, sequence of returns risk near retirement is real. Think of it as a compass, not a GPS: it points the right way, but you still steer around the obstacles. For the fine print, tax wrappers, withdrawal sequencing, a fiduciary adviser earns their fee.

How to use the Retirement Calculator

  1. Enter your current age and the age you’d like to retire, the gap between them is your time horizon.
  2. Add what you’ve already saved and what you can put in every month.
  3. Set a realistic expected annual return, 7% is the classic long run stock market figure.
  4. Hit Calculate to see your projected nest egg, the growth versus contributions split and the 4% rule monthly income.

Frequently asked questions

How much do I actually need to retire comfortably?

The classic rule of thumb is 25 times your annual spending: spend $50,000 a year and you’re looking at roughly a $1.25 million nest egg. But rules of thumb ignore your actual situation, which is exactly why this calculator works backwards from your savings and contributions. It shows the nest egg your plan produces, and you compare that against your spending.

What is the 4% rule, in plain English?

Withdraw about 4% of your savings in the first year of retirement, then adjust for inflation each year after, historically, the money lasts 30 years. The calculator applies it to your projected nest egg for a sustainable monthly income figure. It’s a guideline, not a guarantee: early retirees often plan nearer 3 to 3.5%.

What percentage of my income should I be saving?

Fifteen percent of pre tax income, employer match included, is the standard guidance from planners. But starting early beats the exact percentage, money saved at 25 compounds for 40 years; money saved at 45 gets 20. If 15% feels out of reach, start with what you can and raise it 1% a year. The habit matters more than the starting number.

How does inflation change my number?

Brutally. A $1 million nest egg in 35 years buys far less than $1 million today, at 2.5% inflation, $1,188,000 in 35 years feels like about $500,000 now. That’s why the calculator shows your projection in today’s money next to the nominal figure. Plan in today’s money, it’s the only version your brain actually understands.

Should I max my 401(k) or Roth IRA first?

The usual US order: first contribute enough to the 401(k) to grab the full employer match, an instant 50 to 100% return, free money, then fund a Roth IRA for tax free withdrawals later, then go back to the 401(k). The match beats every investment return on offer. Never leave it unclaimed.

Can I retire at 55, or do I really have to wait until 65?

You can, but the math gets demanding: your savings need to cover roughly 35 years instead of 25, and each year you retire early is both a year of lost contributions and a year of added withdrawals. On the flip side, even a part time income in those early years takes enormous pressure off the portfolio. Plug your age and target into the calculator above and see how the required monthly savings shift when you move the goalpost from 65 to 55.

What are catch up contributions, and how much extra can I save after 50?

They are the IRS's way of letting older workers save more: for 2026, once you turn 50 you can add $8,000 a year on top of the standard $24,500 employee 401(k) limit. Workers aged 60 to 63 get an even higher super catch up of $11,250. If you have been behind on savings, those extra dollars in your final working decade can close a real chunk of the gap, worth a quick run through the calculator above.

When can I start collecting Social Security?

You can start as early as age 62, but your monthly check will be smaller than if you wait. Full benefits start at age 67 for most people born in 1960 or later. Waiting until 70 gives you the largest possible check.

Should I take Social Security at 62 or wait until 70?

Waiting gives you a bigger check every month for the rest of your life. Claiming at 62 cuts your benefit by about 30% compared to full retirement age. If you wait until 70, you get about 24% more than at 67. The best choice depends on your health, savings, and whether you need the money now.

How much will healthcare cost me in retirement?

A couple retiring today may spend around $345,000 on healthcare over retirement, according to Fidelity estimates. Medicare covers a lot but not everything: dental, vision, hearing, and long term care are mostly on you. Budget for premiums and out of pocket costs separately from daily spending.