Retirement Calculator
Estimate how much wealth you can build for retirement.
What Is the Retirement Calculator?
Retirement planning estimates the corpus you'll build by investing a fixed monthly amount from now until your retirement age, based on an expected rate of return. Rather than asking you to guess a generic time horizon, it derives the investment period directly from the gap between your current age and the age at which you plan to stop working.
This framing matters because the number of years you have left to invest is usually the single biggest lever in retirement planning — far more than the monthly contribution amount, since compounding has an outsized effect on money invested decades in advance. Starting even five years earlier, at the same monthly amount and return, typically produces a meaningfully larger corpus than starting later and trying to compensate by investing more each month.
Once you have a projected corpus here, the Financial Freedom Calculator can tell you whether it's actually large enough to cover your expected expenses, and the Net Worth Calculator gives a fuller picture of your current financial position, including assets outside this specific retirement SIP.
Retirement Calculator Formula
FV = P × [((1+r)^n − 1) / r] × (1+r)
Where P = monthly investment, r = monthly return, n = number of months until retirement
How Is the Retirement Calculator Calculated?
This is the same SIP future-value formula applied over the specific window between your current age and retirement age. The number of months is calculated directly from the age gap, so a larger gap between current and retirement age gives compounding significantly more time to work — the formula's exponential term means the effect of extra years grows, rather than just adds, as the horizon lengthens.
Because the formula assumes a constant monthly contribution and a constant return for the entire period, it's a simplified model of what's usually a multi-decade journey with career breaks, income changes, and variable market returns along the way. It's still useful as a planning anchor — just treat the output as a reasonable estimate to revisit periodically, not a locked-in number.
Retirement Calculator Example
Starting at age 30, investing $15,000/month until retiring at 60 (30 years) at 12% return builds a corpus of roughly $52,948,644, from $5,400,000 invested.
Starting earlier at age 25, investing $10,000/month until retiring at 65 (40 years) at 10% return builds a much larger corpus of roughly $63,770,000, from just $4,800,000 invested — a smaller monthly amount but ten extra years of compounding more than makes up the difference.
Starting later at age 40, investing $25,000/month until retiring at 60 (20 years) at 11% return builds a corpus of roughly $21,839,917, from $6,000,000 invested — a much shorter runway means a noticeably smaller corpus despite investing more per month than either earlier example.
How to Use the Retirement Calculator
Step 1
Enter your current age and planned retirement age.
Step 2
Enter your monthly investment amount.
Step 3
Enter the expected annual return.
Step 4
Click Calculate Retirement Corpus to view your projected corpus and total amount invested.
Step 5
Try shifting your retirement age by a few years to see how much it changes the final corpus.
Step 6
Cross-check the result against the Financial Freedom calculator to see if the corpus would actually be enough.
Benefits
- Export your retirement projection as a branded image card to share with a spouse or financial planner.
- Frames retirement planning around your actual age gap rather than an arbitrary duration.
- Shows how much of the final corpus comes from contributions vs. compounding growth.
- Easy to experiment with different retirement ages to see the impact.
- Highlights how much more time in the market matters compared to the monthly contribution alone.
- Free to use with no signup, directly in your browser.
Common Retirement Calculator Scenarios
Scenario 1
Setting a realistic monthly SIP target for retirement based on your timeline.
Scenario 2
Comparing how retiring 5 years later changes your projected corpus.
Scenario 3
A starting point before using the Financial Freedom calculator to check if the corpus is sufficient.
Scenario 4
Deciding between starting retirement investing now at a smaller amount, or waiting and investing more later.
Scenario 5
Modeling the impact of a career break or a delayed retirement age on your projected corpus.
Scenario 6
Setting a benchmark to track actual retirement savings progress against over the years.
Understanding Your Result
The retirement corpus is your projected total savings at your target retirement age, assuming consistent monthly investing at the stated return. Compare this figure against the Financial Freedom calculator's "required corpus" (25× annual expenses) to see if you're on track, or whether you need to adjust your monthly contribution, return assumption, or retirement age.
The gap between total invested and the final corpus shows how much of your retirement wealth is expected to come from market growth rather than your own contributions — for long horizons, that growth portion is often the larger share of the total, which is why starting early matters so much more than most people initially expect.
Tips
- Even a few extra years of investing time can dramatically increase your corpus due to compounding.
- Combine with a Step-Up SIP approach as your income grows over your career.
- Cross-check your target corpus against the Financial Freedom calculator's 25x-expenses benchmark.
- Recalculate periodically as your income, expenses, or target retirement age change.
- Consider running the numbers at a slightly lower return than your optimistic estimate, to see the corpus under a more conservative scenario.
Common Mistakes
- Not accounting for inflation when setting a target corpus — today's "enough" may not be enough decades later.
- Using an overly optimistic return rate for a multi-decade projection.
- Starting retirement planning late and underestimating how much time affects the outcome.
- Assuming the monthly contribution amount matters more than the number of years invested, when the opposite is often true.
- Treating a single projection as fixed instead of revisiting it as income, expenses, and market conditions change.
Frequently Asked Questions
How much should I invest monthly for retirement?
This depends on your target corpus, current age, and years remaining until retirement — try adjusting the monthly amount here to see how it affects your final corpus, then compare against the Financial Freedom calculator's target.
Does this account for inflation?
No, this shows the nominal future value. Consider using the Inflation or Financial Freedom calculators alongside this one to plan for rising costs over a multi-decade horizon.
Should I increase my SIP over time?
Many investors use a Step-Up SIP, increasing contributions annually in line with income growth, to build a larger retirement corpus faster than a flat monthly contribution would.
How do I know if my corpus target is enough?
Use the Financial Freedom calculator to estimate your required corpus based on your expected monthly expenses in retirement (using the 25x annual expenses rule), then compare it to your projected corpus here.
Should I increase my monthly SIP amount as my income grows?
It's generally a good idea — the Step-Up SIP calculator models a fixed annual percentage increase in contributions, which often better reflects real income growth over a career than a flat contribution.
How do I know if my retirement corpus target is realistic?
Compare it against the Financial Freedom calculator's 25x-expenses rule of thumb, and check whether your planned monthly investment and time horizon can realistically reach that target at your assumed rate of return.
Does this calculator account for retirement account tax benefits?
No — it projects pre-tax growth only; certain retirement accounts may offer tax advantages on contributions or withdrawals that aren't modeled here, so check the EPF, PPF & NPS calculator for India-specific retirement account modeling.
What return rate is reasonable to assume for retirement planning?
Many planners use a moderate, diversified-portfolio assumption, lowering it as retirement approaches and the portfolio shifts to more conservative assets to reduce risk near the retirement date.
Is it better to start small and increase later, or invest more now?
Starting earlier — even with a smaller amount — often beats waiting to invest more later, since the extra years of compounding matter more than the monthly amount for most realistic scenarios, as shown in the examples above.
Can I share my retirement projection as an image?
Yes — tap Share and, on supported devices, your projected corpus is shared as a branded image card, not just a text link.
What happens to my corpus once I actually retire?
This calculator only projects the accumulation phase up to retirement; once you stop contributing and start withdrawing, the Reverse SIP (Systematic Withdrawal Plan) calculator models how long that corpus would last under a given monthly withdrawal.
Should I use my current monthly expenses or expected retirement expenses to plan?
Retirement expenses often differ from current ones — some costs like commuting may fall while others like healthcare typically rise — so it's worth estimating retirement-specific expenses separately when setting your target corpus.
Does retiring 5 years earlier really make that much difference to the corpus?
Yes — because compounding is exponential, removing years from the end of a long investment horizon (when the corpus is largest and growing fastest) typically has an outsized negative impact compared to removing the same years from the beginning.
Can I model a retirement plan that includes both an existing lumpsum and ongoing monthly investments?
This calculator assumes starting from zero with only monthly contributions; if you already have savings toward retirement, use the Investment Growth calculator, which factors in both an initial lumpsum and monthly SIP contributions together.
References
Important Information
This calculator provides estimates based on the expected return you enter. Actual investment returns vary with market performance.
Last updated: July 25, 2026