Retirement Savings Calculator

A retirement savings calculator tells you whether your current plan — what you already have, what you add each month, and how many years are left — is going to be enough. It is the single most important back-of-envelope in personal finance, and the number it produces changes everything downstream: when you can stop working, where you live, whether you can help a grandchild with college, whether long-term care wipes out the estate.

Run it once and you get a point estimate. Run it three times — conservative (5% real return, 35-year retirement), base (6% real, 30 years), and stretch (7%, 25 years) — and you get a range. If the range clears your number, you are in good shape. If only the stretch case does, the plan needs more savings rate, not more hope on returns. Pair this with the FIRE Calculator to find your independence number, and the Retirement Gap Analyzer to see what it takes to close any shortfall.

Start with $120,000 already invested and $1,000 a month added (that is 10% of a $120,000 household income). Give it 25 years at a 7% nominal return. The math: $120,000 grows to $651,000 on its own, and the $300,000 of future contributions grows to $779,000 through ongoing compounding. Total: $1.43 million at age 65.

Now the sensitivity: a 5% return cuts the result to roughly $987,000. A 9% return lifts it to $2.1 million. And if instead you save $1,500/month (15% of income), the 7% case jumps to $1.83 million. That last move — $500 more a month — is worth $400,000 over 25 years. It is why raising your savings rate is almost always the biggest lever on the page.

Use today's account statement for the starting balance — do not round up. For monthly contribution, use your actual, delivered-to-the-account number; employer match counts if it is really being deposited. For the return rate, pick one number and stick with it across every calculator on this site so you can compare apples to apples. Most CFPs use 6% as a flat planning assumption; some go 5% for conservative clients and 7% for stock-heavy younger investors. Planning with 10% is wishful; planning with 4% is excessive once you factor in Social Security offsetting part of the spend.

The horizon ("years until retirement") should be the year you expect to stop pulling a paycheck, not a fantasy retirement age. If you are 48 and planning on 65, that is 17 years, not 25. Also include a check against the Retirement Spending Calculator to convert today's dollars into a retirement-era spending number.

Three mistakes wreck most retirement savings plans. One: planning on 10% returns. The S&P 500 averaged ~10% nominal since 1928, but inflation and 0.5% fund fees bring that to roughly 5.5–6% real. Run the 10% number and you will be underfunded by 20–30% in any realistic outcome. Two: ignoring taxes on the way out. A $1,000,000 pre-tax 401(k) is $750,000–$800,000 spendable for most households once federal and state tax come out. Three: treating Social Security as fixed. Claiming at 62 pays 70% of your primary insurance amount; waiting to 70 pays 124%. On a $2,400 PIA that is $1,680 vs $2,976 a month — a $15,552-per-year, lifelong spread.

Specific to this tool: do not mix real and nominal numbers. If your return assumption is 7% nominal, your spending needs to be inflated forward to that year too. Simplest fix: use a 5% real return and keep every other number in today's dollars. Then the output is already in today's purchasing power, no conversion required.

Sensitivity-test each input by +10% and you will see which one moves the result most. For a mid-career saver the rank order is almost always the same: (1) savings rate, (2) years of growth, (3) return rate. Starting balance barely matters at year 0 but dominates the final decade. Contributions matter most in years 1–10. Return rate dominates years 20+ because of compounding.

This is why late starters should not try to close a gap by reaching for return (more risk) — they should close it by raising savings rate and working two or three more years. Our Catch-Up Contribution Calculator quantifies exactly how much extra the 50+ catch-up rules let you stash. For tax-efficient placement, pair with the Roth IRA Calculator and Traditional IRA Calculator.

Run this calculator once a year — December works because any year-end raise, bonus, or match change is already visible. Also run it after any life event that changes the plan: a marriage or divorce, a child leaving college, a parent entering care, a promotion, a layoff, a windfall, a home sale. Each can flip the answer. The 55-year-old's plan is almost never the same plan that was right at 40.

Use this calculator to get a directional answer in five minutes. Hire a fee-only fiduciary CFP (search NAPFA, XY Planning Network, or Garrett) when the retirement savings decision involves any of these: portfolio over $750,000, a defined-benefit pension with a lump-sum option, rental property, concentrated stock (ISOs, RSUs, founder shares), a blended family, special-needs planning, or a move across a state line. A $3,000 one-time plan typically recovers its cost many times over in avoided tax and claim-timing mistakes.

For a simpler situation — single account, single state, standard Social Security — this tool plus an annual self-review is fine. Re-run every October so you still have time to act on the year.

This is not financial, tax, investment, or legal advice. Calculations are educational and rely on the inputs you provide. Tax brackets, contribution limits, Social Security PIA bend points, RMD factors, and Medicare IRMAA thresholds change — verify against the official IRS, SSA, and CMS tables before acting on any number. Past investment returns do not predict future results. For a legally binding plan, engage a licensed fiduciary, CPA, or estate attorney.

This tool runs entirely in your browser — nothing you type is logged, stored, or sent to a server. Use Export PDF to save a clean copy of your inputs and results for a spouse, advisor, or your own records. Missing a retirement savings scenario you need? Email us at hello@retirementhub.dev and we will add it.