Free retirement nest egg calculator
See how big a nest egg you need and what yours is on track to become. Project your savings and compare them against the 25× target your desired income requires — updated live, as you type.
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Estimates only, based on a constant real return and steady saving. Not financial advice.
Results are estimates. Consult a professional.
How big a retirement nest egg do you need?
A retirement nest egg is the total lump sum you need invested by the day you stop working so it can fund the rest of your life. This retirement nest egg calculator does two jobs at once: it projects what your savings will grow to, and it gives you the benchmark to judge whether that figure is big enough — the target lump sum your desired spending requires.
The headline question — "how much is enough?" — has a surprisingly clean answer. Because a sustainable retirement spends roughly 4% of the portfolio in the first year, the target nest egg is about 25 times the annual income you want it to produce. That single multiple turns a vague worry into a concrete number to aim at.
The 25× rule: turning spending into a target
The target nest egg is the mirror image of the withdrawal rate. If you can sustainably withdraw 4% a year, then the lump sum you need is whatever makes your desired income 4% of it — which is the same as multiplying that income by 25.
Crucially, the target is built on the income your savings must provide — not your whole budget. If Social Security or a pension covers part of your spending, subtract that first. The nest egg only has to fund the gap between guaranteed income and the lifestyle you want.
Cooley, Hubbard & Walz (Trinity Study) and Bengen (1994) — the 4% safe withdrawal rate underlying the 25× target.Target nest egg by desired income
The table converts the income you want your savings to produce into the lump sum you need. The middle column (4%) is the standard 25× target; the others show how a more cautious or more aggressive withdrawal rate moves the goal.
| Income from savings | At 5% (20×) | At 4% (25×) | At 3.5% (≈29×) |
|---|---|---|---|
| $40,000 | $800,000 | $1,000,000 | $1,142,857 |
| $50,000 | $1,000,000 | $1,250,000 | $1,428,571 |
| $60,000 | $1,200,000 | $1,500,000 | $1,714,286 |
| $80,000 | $1,600,000 | $2,000,000 | $2,285,714 |
| $100,000 | $2,000,000 | $2,500,000 | $2,857,143 |
Target nest egg = desired income from savings ÷ withdrawal rate. Subtract Social Security or pension income before applying. The calculator above projects your savings; use these multiples to set the target you compare against.
A worked example: projecting toward a target
Leo is 45, has $120,000 saved, adds $900 a month at a 6% return, and retires at 65. He wants about $40,000 a year from his savings — so he needs to know both his target and what he is on track for.
Step 1 — Set the target
Leo wants $40,000 a year from his savings (on top of Social Security). Using the 25× rule, his target nest egg is 40,000 × 25 = $1,000,000.
Step 2 — Project what he is on track for
Over the 20 years to 65, the calculator compounds Leo's $120,000 and his $900 monthly deposits at 6%, projecting a balance of $813,061 at age 65.
Step 3 — Compare against the target
Why your target must be in future dollars
A nest egg target has a hidden trap: $1 million in 30 years buys far less than $1 million today. At 3% inflation, today's $40,000 lifestyle costs roughly $97,000 a year by the time someone retiring in 30 years gets there — which would need a ~$2.4 million nest egg at 25×, not $1 million.
- Set the income target in the dollars of your retirement year, not today's, or inflate today's spending forward before applying the 25× multiple.
- Use the projection's real (inflation-adjusted) value to compare like with like — it expresses the future balance in today's buying power.
- Re-check the target as you approach retirement, when inflation and your actual spending are clearer.
What to do if the projection misses the target
When the projected nest egg lands below the target, you have four levers — and most plans pull more than one:
- Save more each month. The most direct lever, and the one fully in your control today.
- Work a few years longer. Each extra year both adds contributions and gives the whole balance more time to compound — often the single most powerful move.
- Spend a little less in retirement. Lowering the income target cuts the 25× requirement dollar-for-dollar.
- Capture every employer match. Free money that compounds for decades alongside your own contributions.
To measure the exact gap and test these levers, use the retirement shortfall calculator, and see what your target produces as income with the retirement income calculator. Browse the full set in the retirement calculators hub.
Accuracy, assumptions, and sources
This retirement nest egg calculator projects your savings month by month at your expected return, and the 25× target is derived from the 4% safe withdrawal rate established by the Trinity Study and Bengen's research. The 25× multiple assumes a roughly 30-year retirement and a diversified portfolio; a longer horizon needs a larger multiple. Results are planning estimates, not guarantees or financial advice — they exclude taxes, fees, and guaranteed income unless you net those out yourself. Verify any tax rules at IRS.gov and consult a qualified adviser.
Cooley, Hubbard & Walz — Trinity Study on sustainable withdrawal rates (basis of the 25× rule).U.S. SEC Investor.gov — compound interest and long-term saving.Frequently asked questions about the free retirement nest egg calculator
About this retirement nest egg calculator
This retirement nest egg calculator runs entirely in your browser, with nothing sent to a server. It projects your savings month by month at your expected return, and pairs that with the 25× rule so you can size the target lump sum your desired income requires and compare the two as you type.
Calculators Cloud offers 400+ free tools with no sign-up. The full retirement calculators shelf includes Retirement income, Retirement shortfall, and Retirement planning tools alongside this one. Or browse the full calculator directory.