Retirement Planning Calculator at a glance
- What it does
- Estimate the retirement corpus you need and the monthly saving required to reach it, with inflation and withdrawal rates explained honestly.
- Where it runs
- Entirely in your browser — no data is uploaded
- Works offline
- Yes, once the page has loaded
- Cost
- Free, with no account and no usage limit
- Category
- Financial Calculators
How to use the retirement calculator
- Enter your current age and intended retirement age - the difference is your accumulation period.
- Enter your current monthly expenses, not your income. What you spend is what you need to replace.
- Set expected inflation and return rates.
- Read the required corpus and the monthly saving needed to reach it.
How the estimate is built
The calculation runs in three steps.
1. Inflate today's expenses to your retirement date. If you spend ₹50,000 a month now and inflation runs at 6%, in 25 years the same lifestyle costs 50,000 × 1.0625 ≈ ₹2,14,600 a month, or about ₹25.8 lakh a year.
2. Work out the fund needed to sustain that. A common approach is to divide the required annual income by a safe withdrawal rate. At 4%, that is 25 times annual expenses - about ₹6.4 crore in this example.
3. Work backwards to a monthly saving. Using the SIP formula in reverse, at an assumed 12% return over 25 years, that corpus needs roughly ₹34,000 a month.
The figure is large, and that is the point of doing the calculation early rather than late.
The 4% rule, and its limits
The "4% rule" comes from the Trinity Study, which examined historical US market data and found that withdrawing 4% of an initial portfolio in the first year, adjusted for inflation thereafter, survived 30 years in almost every historical period.
It is a useful anchor and a shaky universal rule. It assumes a US-style equity and bond portfolio, a 30-year horizon, and historical returns that may not repeat. Retiring early means a longer horizon, which requires a lower rate - closer to 3 or 3.5% for a 40-year retirement. And it says nothing about sequence-of-returns risk, which is the specific danger of a market fall in the first few years of drawdown: the same average return can exhaust a portfolio or leave it intact depending purely on when the bad years arrive.
A more robust approach is flexibility - reducing withdrawals in poor years - which historically supports a higher average rate than any fixed rule.
The assumptions that dominate the answer
- Inflation. A one-percentage-point difference over 25 years changes the required corpus by roughly a quarter. Medical costs, the largest expense category in later life, typically inflate faster than general prices.
- Return rate. Equally sensitive, and a portfolio usually becomes more conservative approaching retirement, which lowers the expected return in the later years.
- Expenses in retirement. They are not simply today's expenses inflated. A mortgage may end and children become independent, reducing costs; healthcare, travel and support needs may rise. Many planners use 70-80% of pre-retirement spending as a starting point.
- Longevity. Planning to live to 85 when you live to 95 is the failure mode with no remedy. Plan for a longer life than you expect.
- Existing assets and pensions. Provident fund balances, employer pensions and state benefits reduce what you need to build yourself, and this calculator does not know about them.
What actually helps
Start earlier. This dominates everything else. Beginning at 25 rather than 35 can halve the monthly amount required, because the first decade of contributions compounds for the longest.
Increase contributions with income. Raising your saving each year in line with your salary has an effect comparable to a meaningfully higher return, and it is entirely within your control.
Keep costs low. A one-percentage-point difference in fund charges over thirty years can consume a large fraction of the final corpus. This is the one variable where you get a guaranteed improvement.
Recalculate annually. A projection made once at 30 and never revisited is worthless. Circumstances, inflation and returns all change.
Get advice for the details. Tax treatment of retirement accounts, pension options and drawdown strategies vary enormously by country and are worth professional input.
This is a calculator, not advice. It applies a standard formula to the figures you enter and assumes a constant rate of return, no taxes and no fees unless stated. Real markets do not behave that way. Nothing here is a recommendation to buy, sell or hold any investment — see our full disclaimer, and speak to a qualified adviser regulated in your jurisdiction before making a financial decision.
Frequently asked questions
A common rule of thumb is 25 to 30 times your expected annual expenses at retirement, which corresponds to a 3.3-4% withdrawal rate. The right figure for you depends on your retirement age, longevity, other income sources and how flexible your spending can be.
It is a reasonable anchor derived from historical US data over 30-year retirements. It is less safe for early retirement, for other markets, and if the first years of drawdown coincide with a market fall. Treat it as a starting point, not a guarantee.
Long-run averages are often cited around 5-6% in India and 2-3% in developed economies. Consider using a slightly higher figure than the headline rate, since healthcare and education - which matter more in later life - typically inflate faster.
Yes, when planning. This calculator estimates a standalone corpus, so subtract the value of other retirement income to find what you still need to build.
No, but the levers change. Saving more, working a few years longer, and adjusting expected expenses all help substantially. A shorter horizon means contributions matter more than returns, which is at least a variable you control.
Nothing you enter here leaves your browser
Retirement Planning Calculator does its work in JavaScript running on your own device. The page loads once, and after that there is no upload step and no server involved — which matters here because your income, loan and savings figures are nobody else’s business.
You can verify this rather than taking our word for it: load the page, disconnect from the internet, and the tool keeps working. Our privacy policy sets out what is and is not collected, and this guide explains why the distinction matters.