What this calculator does
This 401k calculator is built for the moment you need a defensible number — quoting a client, comparing options, or checking someone else's math — not a generic estimate.
401k plans are employer-sponsored retirement accounts with tax advantages and often an employer match.
How to use the 401k Calculator
- Start by entering **Annual Salary** — this anchors every downstream number in the 401k calculator.
- Fill in **Contribution %**, **Employer Match %**, **Years** to reflect your specific situation.
- Set **Return**; the result and chart recalculate the moment you finish typing.
- Review the breakdown card for the components that make up the headline number.
- Use Copy, Share, or Print to save the exact scenario — or star it to keep it in your favorites.
The formula
Annual contribution × future value of an annuity factor.
Worked example
$75k salary, 10% + 4% match, 7% return for 30 years ≈ $990k.
Common mistakes
- Not contributing enough for full match
- Too conservative asset allocation early
- Cashing out when changing jobs
When to use it
Use to plan contribution levels and verify you're capturing the full match.
Pro tips for the 401k Calculator
- Round-trip check: reverse the inputs to confirm the formula matches what you'd compute by hand.
- Bookmark this page: the URL and inputs are all you need to reproduce the exact result later.
- Save your favorite scenarios by clicking the star icon — they're stored locally, no account needed.
Frequently asked questions
›Contribution limit?
$23,000 in 2024, +$7,500 catch-up if 50+.
›Match is free money?
Yes — always contribute enough to get the full match.
›Rollover options?
Roll old 401ks into an IRA or new 401k.
›Traditional vs Roth 401k?
Roth pays taxes now; traditional defers them.
›Early withdrawal penalty?
10% penalty plus taxes before age 59½.
›How accurate is this 401k calculator?
The formulas match the standard textbook definition shown above. Rounding is applied only for display; underlying computation uses full floating-point precision. For regulated finance decisions, always confirm with a qualified professional.
›Does the 401k Calculator store the numbers I enter?
No. All math runs locally in your browser — nothing is sent to a server, and closing the tab discards the inputs unless you save them to favorites.
Embed this calculator
Drop the 401k Calculator into your own site or blog post. Free to use — a small “Powered by CalcPilot” link is appreciated.
<iframe src="https://calcpilot.tools/calculators/401k-calculator?embed=1" width="100%" height="720" style="border:1px solid #e5e7eb;border-radius:12px;max-width:720px;" loading="lazy" title="401k Calculator — CalcPilot"></iframe>Related calculators
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