Finance & Money
Retirement Savings Calculator
Project an opening retirement balance with fixed end-of-month contributions and a constant annual return assumption. Results show the projected balance, total contributed capital, modeled investment growth, and an illustrative monthly amount equal to four percent of the ending balance divided by twelve.
Projected retirement balance-
Total contributed capital-
Modeled investment growth-
Illustrative monthly draw at 4%-
Exact scenario comparison
Expected annual return (%) scenarios
Exact scenario comparisonExpected annual return (%) changes while all other entered assumptions remain constant.
| Expected annual return (%) | Projected retirement balance | Total contributed capital | Modeled investment growth | Illustrative monthly draw at 4% |
|---|
Period-by-period detail
Monthly schedule and annual summary
How to use Retirement Savings Calculator
- Enter the current retirement balance, monthly contribution, years remaining, and a return assumption stated on the same annual basis.
- Separate total contributed capital from modeled growth and compare alternative contribution, horizon, and return scenarios.
- Treat the four-percent monthly figure as an illustration only and review inflation, taxes, fees, asset allocation, and withdrawal strategy separately.
Calculator guide
Understanding Retirement Savings Calculator
A retirement projection is most useful when it distinguishes money contributed from growth attributed to the return assumption. This page compounds the current balance and recurring contributions on one consistent monthly schedule, then exposes how strongly the ending value depends on time and return.
Calculation method
How the calculation works
Compound the opening balance monthly, add recurring end-of-month contributions, and separate deposits from modeled growth. Compound the opening balance monthly, add recurring end-of-month contributions, and separate deposits from modeled growth.
Worked situations
Practical examples
- Enter only assets intended for the retirement projection; keep emergency savings and near-term spending accounts outside the opening balance.
- Use the monthly employee contribution plus any employer amount that is expected to be deposited consistently.
- Run lower-return and shorter-contribution scenarios to see how sensitive the ending balance is to assumptions and interruptions.
Better inputs
Useful tips
- Use a return assumption consistent with the portfolio's asset mix, fees, and whether values are nominal or inflation-adjusted.
- Increase contributions separately when modeling future raises rather than assuming today's fixed contribution already captures them.
- Review taxes, account withdrawal rules, pensions, Social Security or other public benefits, and retirement spending in a full retirement plan.
Before relying on the result
Limitations and common mistakes
- The model uses one constant return compounded monthly and cannot reproduce market volatility or sequence-of-returns risk.
- Contribution limits, employer vesting, fees, taxes, inflation, salary growth, catch-up rules, withdrawals, and account-specific timing are excluded.
- The four-percent output is an arithmetic illustration, not a safe-withdrawal recommendation or lifetime-income guarantee.
Reference
Key terms
- Contributed capital
- Opening retirement savings plus all modeled monthly deposits, before investment growth.
- Modeled growth
- Projected ending balance less contributed capital.
- Compounding
- Applying return to both original capital and prior modeled gains.
- Illustrative draw
- Four percent of projected balance divided into twelve monthly amounts without a withdrawal simulation.
Important note
Calculated from the entered values and stated financial terms. It is not a product quote, lending decision, tax filing, or investment recommendation.
Frequently asked questions
Are contributions made at the beginning or end of each month?
The projection treats recurring contributions as end-of-month deposits.
Why can a small return change have a large effect?
The rate compounds across many periods and also affects the growth earned by earlier contributions.
Is the result stated in today's purchasing power?
Only if the entered return is already a real return after inflation. Otherwise the output is a future nominal amount.
Does the four-percent amount guarantee the balance will last?
No. Longevity depends on withdrawals, market sequence, inflation, fees, taxes, asset allocation, and retirement horizon.