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Commerce · April 2, 2026

401K-O

The 401k maxing calculator that should have already existed.

What it does

I can max out my 401(k) every year, but every time I get a raise/bonus I have to re-figure out what percentage to set my contributions to. After googling several times with no luck and doing the math myself, I got fed up — this is the entire reason computers exist. So I built 401k-o.com. Free, no email, no login. Includes a "show me the math" breakdown and a whole-percent rounding toggle for plans that require it. US only for now — working on expanding that!

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