Part of:The Complete US Tax Planning Guide 2026: Brackets, Deductions, Credits & Strategies

401(k) Savings Calculator

Project your 401(k) growth with our detailed calculator, including employer match. See how your contributions can grow into a substantial nest egg for retire...

401(k) Calculator — Growth, Employer Match & Retirement Age

Project how your 401(k) balance grows with regular contributions and employer matching, and see how the retirement age you choose — including your Social Security full retirement age — changes the outcome.

How This 401(k) Calculator Works

Enter your current 401(k) balance, annual contribution, employer match percentage, expected annual return, and the age you plan to retire. The calculator compounds your contributions and match year over year to project your balance at retirement. Because compounding rewards time in the market, the retirement age you choose is one of the biggest levers on your final projected balance — more so, in many cases, than the contribution amount itself.

Choosing a Retirement Age

There is no single "right" retirement age to enter — it depends on when you plan to stop working and start drawing down savings. Two common anchors people use:

  • Your Social Security full retirement age (66–67 depending on birth year) — the age at which you'd receive 100% of your calculated Social Security benefit.
  • Age 59½ — the age at which 401(k) withdrawals can begin without the 10% early-withdrawal penalty (separate from Social Security).

Try running the calculator at a few different ages (for example 62, 67, and 70) to see how each additional year of contributions and growth changes your projected balance.

Social Security Full Retirement Age Chart

Full retirement age (FRA) is set by federal law under the Social Security Amendments of 1983 and depends only on your birth year — it is a fixed schedule, not a rate that changes annually.

Birth YearFull Retirement Age
1943–195466
195566 and 2 months
195666 and 4 months
195766 and 6 months
195866 and 8 months
195966 and 10 months
1960 or later67

You can also claim a reduced benefit starting at age 62, or delay past full retirement age (up to 70) to earn delayed retirement credits. Source: Social Security Administration (ssa.gov/benefits/retirement/planner/agereduction.html). This 401(k) calculator does not compute your Social Security benefit — use the SSA's own estimator for that, based on your actual earnings record.

Frequently Asked Questions

What retirement age should I use in this 401(k) calculator?▼
The "retirement age" field is simply the age at which you plan to stop contributing and start withdrawing — it drives how many years your contributions and employer match have to grow. Many people align it with their Social Security full retirement age (66–67, depending on birth year) or with when they expect to stop working, whichever comes first. Running the calculator at a few different retirement ages (e.g., 62, 67, and 70) is a quick way to see how much extra growth a few more working years can add.
What is the Social Security full retirement age?▼
Full retirement age (FRA) — the age at which you receive 100% of your calculated Social Security benefit — depends on your birth year under the schedule set by the Social Security Amendments of 1983: 66 for people born 1943–1954, gradually rising in two-month increments for those born 1955–1959, and 67 for anyone born in 1960 or later. This is a fixed federal schedule, not a number that changes year to year like a tax rate. Source: Social Security Administration (ssa.gov/benefits/retirement/planner/agereduction.html).
What is the Social Security retirement age chart?▼
Birth year 1943–1954: full retirement age 66. Birth year 1955: 66 and 2 months. 1956: 66 and 4 months. 1957: 66 and 6 months. 1958: 66 and 8 months. 1959: 66 and 10 months. Birth year 1960 or later: 67. You can also claim reduced benefits as early as age 62, or delay past full retirement age up to age 70 to earn delayed retirement credits (an increase of roughly 8% per year of delay). Source: Social Security Administration.
How does Social Security retirement age relate to my 401(k)?▼
Your 401(k) and Social Security are independent but usually planned together: Social Security has its own fixed full retirement age (66–67 depending on birth year) set by federal law, while your 401(k) can be accessed penalty-free starting at age 59½ (with required minimum distributions currently starting at 73 under the SECURE 2.0 Act). Many people time their overall retirement — and the retirement age they enter into a 401(k) calculator — around whichever of these milestones fits their plan, since claiming Social Security earlier or later changes your monthly benefit while your 401(k) balance depends on how long it stayed invested.
Is there a dedicated Social Security retirement calculator?▼
This tool calculates 401(k) growth, not your Social Security benefit amount — those are computed from your lifetime earnings record using a different formula administered by the SSA. For an actual Social Security benefit estimate, use the SSA's own retirement estimator, which has access to your real earnings history. Use this 401(k) calculator alongside that estimate to see your full retirement income picture: projected 401(k) balance plus estimated Social Security benefit.
Why does starting age matter so much for 401(k) growth?▼
Because of compounding, the number of years between your current age and your chosen retirement age is one of the biggest drivers of your final balance — often larger than the contribution amount itself. Two savers contributing the same amount but starting 10 years apart can end up with dramatically different balances by a shared retirement age, simply because the earlier saver's contributions had more years to compound. This is why testing a few different retirement ages in the calculator is worth doing even if you're not sure exactly when you'll retire.

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Methodology, sources & limitations

This calculator uses a published formula and the values entered in the calculator to generate the result.

Formula
FV = Σ (Contribution + Match) × (1+r)^remaining_years
Jurisdiction & units
Intended for US, IN, EU, GB, AU, CA. Supports both units where applicable.
Assumptions & limitations
Results use the inputs you provide and published formulas or rate assumptions. They are estimates, not financial, tax, lending, or investment advice.
Review status
Formula and automated QA completed May 22, 2024; independent professional review is pending. Next scheduled review: November 22, 2026.

Validation sources

  • IRS 401(k) Limits
  • DOL ERISA Guidelines

401(k) Calculator — Answer & Method

Project 401(k) retirement savings with employer match and tax benefits.

Formula: 401(k) Growth

FV = Σ (Contribution + Match) × (1+r)^remaining_years

C = Annual Contribution (USD)
Match = Employer Match (%)

Example Calculation

$80K salary, 10% contribution with 5% match at 7% return for 30 years yields ~$1.2M.

Important limitation

This is an estimate based on your inputs, not financial, lending, tax, or investment advice.

Key Facts

  • The 2026 401(k) contribution limit is $23,000 ($30,500 for 50+).
  • Employer matching is essentially free money for retirement savings.

Sources & Validation

IRS 401(k) LimitsDOL ERISA Guidelines

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Deterministic: YesAI-Generated Numbers: NoVerified: 2026-02-12

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