401(k) Retirement Savings Calculator
Result
401(k) Retirement Savings Calculator This 401(k) calculator estimates how large your retirement account could grow by the time you retire. Enter your annual contribution, the number of years until retirement, and an expected annual return, and it projects — free online calculator.
Formula
- 401(k) retirement savings growth calculator. This page documents the calculation model and provides an educational worked example.
- The main inputs are Initial savings, Annual contribution, Annual return, Years, Compounds per year. Enter them in the units and format shown in the calculator.
- Use monetary amounts, rates and time periods exactly as labeled; the result reflects the assumptions entered on this page.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: 401(k) Retirement Savings
- Initial savings: 10000
- Annual contribution: 2000
- Annual return: 7 %
- Years: 10
- Compounds per year: 12
Contributing 6,000 per year for 20 years at an assumed return grows beyond the 120,000 contributed because of compounding.
Sample result: Calculating…
Frequently asked questions
What does the 401(k) Retirement Savings calculate?
This is a projection using an assumed return, not a guarantee; taxes, fees, employer match rules, and contribution timing can change results.
Which values should I enter?
Enter Initial savings, Annual contribution, Annual return, Years, Compounds per year using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: FV of contributions uses compound growth over the years to retirement; contribution timing determines the exact annuity factor.
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.