Calculators
401(k) Calculators
Contribution limits, employer match, Roth comparisons, and every tax angle on your 401(k) — plus the specialty calculators we're adding next — all free, no signup.
401(k) calculators
Live now — built and tested against the actual IRS contribution limits and tax formulas, not a generic estimate.
401k Max Contribution Calculator
LiveFind the per-paycheck amount needed to hit the annual IRS limit.
401k Match Calculator
LiveCheck whether you're capturing your full employer match.
Roth or 401k Calculator
LiveCompare Roth vs. traditional 401(k) growth side by side.
Taxes on 401k Withdrawal Calculator
LiveSee the penalty and tax owed on an early 401(k) withdrawal.
401k Paycheck Calculator
LiveSee how a contribution change affects your take-home pay.
401k Tax Deduction Calculator
LiveEstimate tax owed on a 401(k) withdrawal or Roth conversion.
Specialty 401(k) calculators
The less common — but still frequently searched — 401(k) situations, launching on a rolling basis.
From the blog
Deep dives to help you get more out of every calculator above.
Solo 401(k) for the Self-Employed: Contribution Limits, Profit Sharing, and Fees Explained
Why a Solo 401(k) can let you save two to three times more than a SEP IRA at the same income.
Read more →Should You Convert Your 401(k) to a Roth IRA? The Tax Math Explained
What a conversion actually costs today, and when it pays for itself in retirement.
How a 401(k) Actually Gets Split in a Divorce (QDROs Explained)
Why you can't just write a check, and what a Qualified Domestic Relations Order actually requires.