401(k) Calculator

A 401(k) calculator projects the future value of a US employer-sponsored retirement account, accounting for employee contributions, employer matching, and compound investment growth over time. The 401(k) is the most common US workplace pension, with contributions made pre-tax

The calculator uses the standard published formula for 401k. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches, percentages. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: Use future value of annuity formula: FV = PMT × [(1+r)ⁿ − 1] / r. Each step in the calculation is shown so you can verify the result manually.