Compare calculators

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

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.

Investing

Cost Basis Calculator

Calculates your average cost per share across multiple stock purchases by dividing total dollars invested by total shares owned. Use it to determine your tax cost basis when selling shares bought at different prices.

Total Shares Owned (shares)

Total Amount Invested ($)

Fill in the required fields to see your result.

Key differences

	401k Calculator	Cost Basis Calculator
Category	Investing	Investing
Inputs required	7	2
Result	401k Balance at Retirement ($)	Average Cost Basis ($)
What it does	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.	Calculates your average cost per share across multiple stock purchases by dividing total dollars invested by total shares owned. Use it to determine your tax cost basis when selling shares bought at different prices.