Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Retirement Age Calculator

Estimate the age at which your invested savings will support your target annual retirement income at a given safe withdrawal rate. Iterates forward one year at a time up to age 100.

Current age (years)

Current retirement savings ($)

Monthly contribution ($)

Expected annual return (%)

Target annual retirement income ($)

Safe withdrawal rate (%)

Fill in the required fields to see your result.

Investing

401k Calculator

Projects your 401(k) balance at retirement by combining your current savings, ongoing contributions, employer match, and expected investment growth. Use it to see whether you are on track and how much employer matching adds to your nest egg.

Current 401k Balance ($)

Annual Salary ($)

Employee Contribution (%)

Employer Match (% of contribution)

Employer Match Limit (% of salary)

Annual Return Rate (%)

Years Until Retirement (years)

Fill in the required fields to see your result.

Key differences

	Retirement Age Calculator	401k Calculator
Category	Retirement	Investing
Inputs required	6	7
Result	Estimated retirement age (years)	401k Balance at Retirement ($)
What it does	Estimate the age at which your invested savings will support your target annual retirement income at a given safe withdrawal rate. Iterates forward one year at a time up to age 100.	Projects your 401(k) balance at retirement by combining your current savings, ongoing contributions, employer match, and expected investment growth. Use it to see whether you are on track and how much employer matching adds to your nest egg.