Lumpsum Calculator

Estimate the future value of a one-time (lumpsum) investment based on an expected annual rate of return and the investment period.

How to Use the Lumpsum Calculator

  1. Enter the "Lumpsum Investment (₹)" you plan to invest as a one-time amount.
  2. Enter the "Expected Annual Return (%)" you anticipate from the investment.
  3. Enter the "Investment Period (years)" you plan to stay invested.
  4. Click "Calculate" to see your total investment, estimated returns, and maturity value.

Worked Example

Suppose you invest ₹1,00,000 once and expect 12% a year for 10 years. The calculator works out 1,00,000 × 1.12^10 = ₹3,10,585. Your estimated returns are ₹2,10,585, more than double the amount you put in, even though you never added another rupee. The growth comes from compounding: in year one you earn 12% on ₹1 lakh, but by year ten you are earning 12% on about ₹2.77 lakh.

What ₹1 Lakh Grows To

Value of a one-time ₹1,00,000 investment at different steady annual returns:

Annual return5 years10 years15 years20 years25 years
6%₹1,33,823₹1,79,085₹2,39,656₹3,20,714₹4,29,187
8%₹1,46,933₹2,15,892₹3,17,217₹4,66,096₹6,84,848
10%₹1,61,051₹2,59,374₹4,17,725₹6,72,750₹10,83,471
12%₹1,76,234₹3,10,585₹5,47,357₹9,64,629₹17,00,006

Two patterns stand out. Time matters more than people expect: at 12%, the last 5 years of a 25-year holding add over ₹7 lakh, more than the first 15 years put together. And small differences in return compound into large gaps, as the 25-year column shows. A quick check is the rule of 72: divide 72 by the annual return to estimate how many years it takes money to double. At 12% that is about 6 years; at 8%, about 9.

Choosing a Realistic Return

The answer is only as good as the rate you enter. For a bank fixed deposit or a government small savings scheme, use the rate actually on offer. For equity mutual funds there is no fixed rate; returns swing from strongly negative in a bad year to strongly positive in a good one, and long-run averages are not guaranteed to repeat. It is sensible to run the calculator at two or three rates, for example a cautious, a middle and an optimistic case, and plan around the cautious one. Enter returns after fund expenses: a mutual fund NAV already reflects its expense ratio, so a direct plan and a regular plan of the same fund will grow at slightly different rates.

Inflation and Tax: What the Maturity Value Is Really Worth

The maturity value is in future rupees. If prices rise 6% a year, the ₹3,10,585 from the example would buy roughly what ₹1,73,400 buys today. To see growth in today's money, enter your return minus inflation as an approximation; 12% return with 6% inflation is a real return of about 5.7%.

Tax also comes out of the gains. As of 2026, for equity mutual funds held more than 12 months, long-term capital gains above ₹1.25 lakh in a financial year are taxed at 12.5%, and gains on units held 12 months or less are taxed at 20%. Gains on debt funds bought after 1 April 2023 are taxed at your income-tax slab rate, and fixed deposit interest is taxed every year at your slab rate even if you do not withdraw it. Check the current rules before you redeem, as capital gains tax is often changed in the Budget.

Frequently Asked Questions

It uses the compound interest formula: Future Value = P × (1 + r)^n, where P is your lumpsum investment, r is the expected annual return rate, and n is the number of years invested.

A lumpsum investment puts the entire amount to work from day one, so returns compound on the full amount for the whole period. A SIP instead invests smaller amounts every month, so each installment compounds for a different length of time.

No. This is an illustrative estimate assuming a constant annual return. Actual returns from mutual funds, stocks, or other market-linked investments will vary year to year.

Investing at once gives the money the most time in the market, but if markets fall soon after, the whole amount takes the hit. Many investors with a large sum for equity funds park it in a liquid or debt fund and move it into equity in instalments over 6 to 12 months through a systematic transfer plan (STP). This reduces the risk of investing everything at a market peak, at the cost of some money sitting in a lower-return fund for a while.

Only approximately. This calculator compounds once a year, while most bank FDs in India compound quarterly, which gives a slightly higher maturity amount at the same rate. For an FD that pays out interest monthly or quarterly instead of reinvesting it, there is no compounding at all, so use a simple interest or FD calculator.
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