NerdWallet 401(k) Calculator
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NerdWallet's 401(k) calculator is purpose-built for a single job: showing what your 401(k) will be worth at retirement. You enter your monthly contributions, your employer's match (if any), your expected annual return, and years until retirement, and it projects your balance. The clarity here is that it doesn't bundle in Social Security, pensions, or other income sources, just this one account's growth.
It's useful for people who want to understand the 401(k) part of their retirement in isolation, or for testing how much of an increase in contributions would accelerate your target number. If you're deciding between contributing the company match versus maximizing a Roth IRA, this tool shows you what you're committing to the 401(k). It works best as one input among several, not as your complete retirement plan.