Find the % of income you need to save to retire by your target age.
Required savings rate
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Annual savings needed
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Target portfolio (4% rule)
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Your breakdown
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What the calculator solves for
Most retirement tools ask how much you will have. This one runs the question backward: given the age you want to stop working, what share of your income do you have to bank starting now? It first sets a target portfolio at 25 times your retirement expenses, the 4 percent rule baked straight in. Then it solves the future-value-of-an-annuity formula for the level annual contribution that grows into that target over your remaining working years, using the real return you supply. Divide that contribution by your gross income and you have a savings rate.
Because the return input is labeled real, you are working in inflation-adjusted dollars throughout. That keeps the answer honest: a 5 percent real return roughly matches a diversified stock-heavy portfolio after subtracting long-run inflation, so you are not fooling yourself with nominal growth that inflation quietly eats.
A 25-year runway to a $1.5 million target
The default profile is a 30-year-old earning $100,000 who wants to retire at 55 on $60,000 a year, assuming a 5 percent real return. Here is the chain the calculator follows.
Saving $31,429 of a $100,000 income every year, growing at 5 percent real, compounds to the $1.5 million target in 25 years. That is a 31.4 percent savings rate, which the tool flags as aggressive but achievable with discipline. Notice how little of the final balance comes from contributions versus growth as the years stack up.
The lever that moves the rate most
Retirement age dominates this calculation, far more than income or return. Push the same 30-year-old's retirement from 55 to 65 and the runway doubles from 25 to 35 years, which lets compounding do most of the heavy lifting and collapses the required rate toward the low teens. Pull it forward to 45 and the rate vaults past 50 percent. The relationship is exponential, not linear, because every year you keep working is both one more year of contributions and one more year for the whole balance to grow. If your required rate looks impossible, the most powerful adjustment is almost always a later target age, followed by lower retirement spending.
What the math leaves out
Two simplifications are worth naming. First, the tool assumes you start from zero and ignores any balance you have already saved, so if you have a meaningful nest egg today your true required rate is lower than shown. Second, it holds your contribution level flat in real terms and does not model raises, so a saver whose income climbs can often start below the stated rate and catch up later. Treat the result as a disciplined baseline, then adjust for your starting balance and expected income trajectory.
One refinement that materially changes the number: the expense figure should include the taxes you will owe in retirement, not just your spending. Money pulled from a traditional 401(k) or IRA is taxed as ordinary income on the way out, so a household that wants $60,000 to spend may need the portfolio to throw off closer to $70,000 before tax. Understating that gap is one of the quieter ways a savings plan comes up short. If most of your retirement assets will sit in a Roth, the tax drag is smaller and your raw spending figure is closer to the truth, which is part of why where you hold the money matters as much as the savings rate itself.
Does the savings rate include my employer 401(k) match?
It does not separate them, but it should include them. The rate the tool returns is total dollars going toward retirement divided by gross income. If your employer adds a 4 percent match, that counts toward the savings figure, so you personally may only need to defer the remainder out of pocket. Free matching money is the cheapest way to hit a high rate.
What real return should I assume?
For a long horizon, 4 to 5 percent real is a reasonable planning figure for a stock-tilted portfolio, and 3 percent is more cautious for a balanced 60/40 mix. Avoid plugging in 8 or 9 percent, those are nominal numbers, and using them in a real-dollar model will badly understate how much you need to save.