Lumpsum Calculator

A lumpsum investment means putting a single amount to work at one time, for example investing a bonus, the proceeds of a property sale or a maturing deposit in a mutual fund. This calculator estimates what that one-time amount could grow to after a chosen number of years, assuming a constant annual rate of return compounded once a year.

How to use this calculator

1. Enter the amount invested (for example, ₹5 lakh).
2. Enter the expected annual return in percent.
3. Enter the time period in years.
4. Read the estimated future value and the estimated gain.

Comparing two or three return assumptions gives a more honest picture than a single number.

Formula

FV = P × (1 + r)^t

• FV = estimated future value
• P = amount invested today
• r = expected annual return ÷ 100
• t = investment period in years

Estimated gain = FV − P.

Worked example

You invest ₹5 lakh once and leave it for 10 years, assuming 12% a year.

• (1 + 0.12)^10 ≈ 3.1058
• FV = 5,00,000 × 3.1058 ≈ ₹15.53 lakh

At 12%, money roughly triples in ten years. At 8%, the same ₹5 lakh would grow to about ₹10.79 lakh, which shows how much the assumed rate matters.

A quick check is the "rule of 72": divide 72 by the annual return to get the approximate years needed to double. At 12%, that is about six years.

Things to keep in mind

• Returns are assumptions. Equity and hybrid mutual funds do not earn a fixed annual return. A lumpsum is fully exposed to market timing: a fall soon after investing hurts more than it would with a SIP.
• Staggered entry. Some investors park a lumpsum in a liquid or short-term debt fund and move it into equity through a systematic transfer plan (STP) over several months. This calculator does not model an STP.
• Costs. Enter a return after the fund's expense ratio. Direct plans have lower costs than regular plans.
• Taxes. For equity-oriented funds, long-term capital gains on units held over 12 months are taxed at 12.5% above ₹1.25 lakh in a financial year, and short-term gains at 20%. Debt fund units bought after 1 April 2023 are taxed at your slab rate. These rates continue for FY 2026-27 under the Income-tax Act 2025, though section numbers have changed. Results here are before tax.
• Exit loads. Many equity schemes charge an exit load if you redeem within a set period, often one year.
• Inflation. If inflation averages 5–6%, the real (inflation-adjusted) growth is much lower than the nominal figure shown.
• Other uses. The same formula works for any asset with annual compounding, such as estimating what a property or gold holding might be worth at an assumed growth rate. To measure the rate you actually earned, use the CAGR calculator.

This calculator is for education and planning. It is not investment advice.