Retirement savings calculator to project retirement corpus, monthly retirement income, and savings gap from age, current savings, contributions, and return rate.
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Financial Calculation Disclaimer
Results from this calculator are estimates based on user-supplied numbers for informational and planning purposes only. Actual interest rates, loan terms, taxes, and financial outcomes may vary depending on your institution, jurisdiction, and market conditions. This tool does not constitute professional financial, tax, or investment advice.
Retirement planning stays abstract without a concrete number. This calculator turns your current age, retirement age, current savings, monthly contribution, and expected return into a projected retirement corpus, then applies the 4% rule - the same benchmark researched by financial adviser William Bengen in 1994 - to estimate a sustainable monthly income from that corpus.
Comparing that estimate against your target monthly income is what usually motivates a change in contribution rate.
This retirement savings calculator projects your retirement corpus from your current savings, monthly contributions, and expected annual return, then estimates a sustainable monthly income from that corpus using the standard 4% annual withdrawal rule - showing the gap against your target monthly income.
Add current age, retirement age, current savings, monthly deposits, and target income.
The calculator estimates retirement corpus using expected annual return.
Check sustainable monthly retirement income and income gap.
Adjust contributions and retirement age to compare outcomes.
Enter your Current Age, Retirement Age, Current Retirement Savings, Monthly Contribution, and Expected Annual Return to see your Estimated Retirement Corpus.
Read the Estimated Monthly Income figure - it's your projected corpus multiplied by 4% annually, divided by 12.
Enter your Target Monthly Retirement Income to see the Income Gap vs Target - a positive number means you're projected to exceed your target; negative means a shortfall.
Increase Monthly Contribution and recalculate to see how much it closes an income gap - since there's no reverse calculation, this is a manual trial-and-error process.
Re-run the same savings and contribution at a different Retirement Age to see how a few more (or fewer) years of compounding change the projected corpus.
Best For
Input
Current Age 30, Retirement Age 60, Current Retirement Savings 25,000, Monthly Contribution 500, Expected Annual Return 8%, Target Monthly Retirement Income 3,000Result
Estimated Retirement Corpus 1,023,540.83, Estimated Monthly Income 3,411.80, Income Gap vs Target 411.80, Years Until Retirement 30.00Estimated Monthly Income is the projected corpus x 4% divided by 12 (the 4% rule); Income Gap vs Target is that figure minus the entered target - a positive gap here means the projection exceeds the target by 411.80 per month.
Enter your actual savings, contribution, and return assumption to see a projected corpus and sustainable income compared against your target.
Increase Monthly Contribution and recalculate to see how much it grows the projected corpus and closes an income gap.
Re-run the same inputs at different Retirement Age values to see how a few more years of contributions and compounding change the outcome.
Problem
Solution
The calculator doesn't solve backward from your target income to tell you how much to save each month - Monthly Contribution is an input you set and adjust yourself, then compare the resulting Income Gap.
Problem
Solution
There's no inflation input anywhere in this calculator - Target Monthly Retirement Income and the projected corpus are both in the same, non-inflation-adjusted dollars you enter.
Problem
Solution
The 4% rule is applied as a flat, indefinite withdrawal assumption - there's no field for life expectancy or a specific number of retirement years, so the sustainable-income figure isn't tied to a chosen drawdown horizon.
Problem
Solution
The 4% figure is calculated directly from the projected nominal corpus - if you want your target to reflect inflated future costs, inflate your Target Monthly Retirement Income yourself before entering it.
Since the calculator doesn't adjust for inflation, use the Inflation Calculator to project what your desired monthly income will actually cost by your retirement age, then enter that inflated figure as your target.
There's no reverse mode - test a few different contribution amounts manually to see which one closes your Income Gap.
The withdrawal assumption behind Estimated Monthly Income is a widely used planning rule, not a promise - actual sustainable withdrawal rates vary with market conditions and how long retirement lasts.
Update your inputs periodically as your savings, contribution amount, or return expectations change, since the projection is only as current as the numbers you enter.
There's no inflation input anywhere in this calculator - the projected corpus and your Target Monthly Retirement Income are both treated in the same, non-inflation-adjusted dollars you enter.
The calculator doesn't compute a required monthly contribution from a target income - Monthly Contribution is an input, and Income Gap vs Target is only a dollar comparison of your projection against your target.
The 4% withdrawal assumption is applied as a flat, indefinite rate - there's no field for how many years the withdrawal needs to last, so the sustainable-income estimate isn't tied to a chosen retirement length.
A single fixed annual return compounds smoothly across the entire projection - real investment returns vary year to year, which this calculator doesn't simulate.
This figure is formatted as a plain number (like "30.00 years") rather than a rounded whole number or a years-and-months breakdown.
Selecting a different currency changes the currency code shown next to each figure - it doesn't convert the entered values using an exchange rate.
The second figure is derived entirely from the first, using the 4% withdrawal rule.
| Estimated Retirement Corpus | Estimated Monthly Income | |
|---|---|---|
| What it shows | The projected lump sum accumulated by your Retirement Age | The projected corpus x 4% annually, divided by 12 - a sustainable monthly withdrawal estimate |
| Depends on | Current Retirement Savings, Monthly Contribution, Expected Annual Return, and years until retirement | Entirely derived from Estimated Retirement Corpus - no separate inputs of its own |
| Best for | Seeing the accumulation-phase result on its own | Comparing against your Target Monthly Retirement Income |
Which should you use?
Estimated Monthly Income is always exactly 4% of Estimated Retirement Corpus divided by 12 - if the corpus projection changes, the income estimate changes with it in fixed proportion.
The most useful thing to know before entering numbers: sustainable monthly income here is calculated using the 4% rule - the same benchmark backed by Bengen's 1994 research - applied to your projected corpus, and the calculator doesn't adjust for inflation or ask about your expected retirement length. The FAQs below cover the 4% rule and exactly what is and isn't factored in.
A widely used rule of thumb is the 4% rule: multiply your desired annual retirement income by 25. If you want $40,000 per year in retirement, you need approximately $1,000,000 saved. This rule assumes the portfolio is invested and withdrawals are sustainable over a 30-year retirement. Your actual number depends on retirement age, inflation, and other income sources like Social Security or a pension.
The 4% rule states that you can withdraw 4% of your retirement portfolio each year without depleting it over a 30-year period, assuming a balanced stock-and-bond investment. It was derived from historical market data by financial planner William Bengen in 1994. It is a planning benchmark, not a guarantee - actual outcomes vary with market conditions and inflation.
It depends on your current age, existing savings, and income target. As a rough estimate: starting at 30 with no savings and targeting a $1 million portfolio by 65 requires saving approximately $700 to $900 per month at a 7% average annual return. Starting at 40 with the same goal requires roughly $1,800 to $2,200 per month. Earlier is significantly cheaper because of compounding time.
Retirement corpus refers to the total accumulated savings at the point of retirement - the lump sum from which income is drawn throughout retirement. It is the target balance the calculator projects based on your current savings, monthly contributions, and expected return rate.
Yes, significantly. Inflation erodes purchasing power over time, meaning the same monthly income will buy less in 20-30 years than it does today. A $3,000 monthly retirement income today requires roughly $5,400 in 20 years just to maintain the same purchasing power at 3% annual inflation. Factor inflation into your income target when planning.
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