Conservative return
Lower the return assumption and see whether the contribution plan still looks reasonable.
Savings calculator
Retirement Savings Calculator
Estimate how a current balance and monthly contributions could grow over time using a simple assumed annual return. This is for education, not investment advice.
Last reviewed: June 10, 2026
Estimate future savings
Estimated future balance—
Total contributions—
Estimated growth—
Live scenario comparison
Lower return—
Current inputs—
+$100 monthly contribution—
Future balance breakdown insight
This insight updates to compare deposits with estimated growth.
Total contributions—
Estimated growth—
Formula
The calculator compounds the current balance monthly and adds monthly contributions at the end of each month. It does not simulate volatility or taxes.
Worked example
With $25,000 already saved and $500 monthly contributions for 25 years, the assumed return has a large effect because growth compounds for many years.
How to interpret the projection
The future balance is a steady-rate estimate, not a prediction. The total contributions line shows how much came from the starting balance and monthly deposits. The estimated growth line shows the portion created by the assumed return in this simplified model.
Run at least three versions: a lower-return case, a base case, and a higher-contribution case. This makes the projection more useful because it shows which input changes the outcome most.
What the calculator excludes
The projection does not include investment volatility, fees, taxes, employer matches, contribution limits, withdrawals, inflation, or sequence risk. For purchasing-power context, compare the result with the inflation calculator and read retirement savings basics.
Common planning mistakes
- Using a nominal future balance without checking future purchasing power.
- Forgetting fees, taxes, contribution limits, and employer-match vesting rules.
- Increasing assumed return to make a target appear reachable.
- Ignoring how gaps in contributions can affect long-term compounding.
Related tools and guides
Use the savings withdrawal calculator to explore drawdowns, the compound interest calculator for general growth, safe withdrawal concepts for retirement income context, and how long will my money last for withdrawal-duration scenarios.
FAQ
Is the assumed return guaranteed?
No. It is only an input for an educational projection.
Does this include inflation?
No. Use the inflation calculator to understand purchasing-power changes separately.
How to read this estimate
The result is an educational estimate based only on the inputs shown on this page. It is useful for comparing assumptions, spotting cost drivers, and understanding the formula, but it is not a recommendation or a guarantee.
Before using a result for a real decision, compare it with official documents, local rules, fees, taxes, insurance, and any professional guidance that applies. See How We Calculate and the Disclaimer for more context.
Scenario comparison
Retirement projections are sensitive to time, contribution rate, and assumed return, so a single result should not be treated as a forecast. Run a conservative return case, a current-contribution case, and an increased-contribution case. This shows whether the result depends mainly on market assumptions or on savings behavior you can control.
For a stronger comparison, keep the time horizon the same and change one input at a time. If the gap between conservative and optimistic return assumptions is very large, use the lower result as a planning stress test rather than stretching the return assumption to meet a goal.
Current habit
Use the amount currently being saved each month to create a realistic baseline.
Higher contribution
Increase contributions before increasing the assumed return, because contribution behavior is easier to control.
Result quality checklist
- The assumed return is not presented as guaranteed or personalized investment advice.
- Inflation, taxes, fees, employer matches, and contribution limits are reviewed outside this simple projection.
- The projection is compared with at least one lower-return or lower-contribution stress case.
- The future balance is translated into purchasing-power and withdrawal context before being used for planning.
Before you rely on the number
Use the calculator as a comparison tool rather than a final answer. The most helpful result is usually the direction of change: which input moves the outcome most, which assumption creates the biggest risk, and whether the monthly cash flow still feels realistic after normal life expenses. Save or write down the inputs used for each scenario so you can compare them consistently later.
Any simplified calculator leaves out details that can matter in real accounts, contracts, tax rules, and local markets. If a result will influence a major purchase, loan, payoff plan, savings target, or household budget, compare it with official documents and independent estimates. Treat surprising results as a prompt to check the inputs first, then review the assumptions behind the formula.
Related calculators
Use the compound interest calculator for general growth assumptions, the savings withdrawal calculator for drawdown examples, and safe withdrawal concepts for educational retirement-income context.
Why should I run a lower-return scenario?
A lower-return scenario helps show whether the plan still works if actual results are weaker than the baseline assumption.