What does a lumpsum calculator do?
A lumpsum calculator estimates the future value of money you invest once and leave to grow. It is useful for planning what to do with a bonus, the proceeds of a matured FD, the sale of an asset or any large amount you do not need for several years.
Unlike a SIP, where money goes in every month, the whole amount starts compounding from the first day. That makes time the single most important factor in the result.
How to use it
- Total investment: the one-time amount you plan to invest.
- Expected return: the average yearly return you expect.
- Time period: how many years you will stay invested.
Lumpsum formula
- FV = future value
- P = amount invested
- r = expected annual return (as a decimal, so 12% = 0.12)
- n = number of years
Worked example
If you invest ₹1,00,000 today and it grows at 12% a year, after 10 years it becomes ₹1,00,000 × (1.12)10≈ ₹3,10,585. Your money has roughly tripled, with ₹2,10,585 coming from growth.
The effect of time
₹5,00,000 invested once at 10% a year:
| Years | Estimated value | Gain |
|---|---|---|
| 5 | ₹8,05,255 | ₹3,05,255 |
| 10 | ₹12,96,871 | ₹7,96,871 |
| 20 | ₹33,63,750 | ₹28,63,750 |
Doubling the period from 10 to 20 years makes the gain more than three times larger. This is compounding: later years grow on a much larger base.
The Rule of 72
A quick way to estimate how long money takes to double: divide 72 by the yearly return. At 12%, money doubles in about 6 years (72 ÷ 12). At 8%, it takes about 9 years. It is a handy check on the calculator's result. The same maths drives bank deposits; see the compound interest calculator.
Lumpsum vs SIP
- Lumpsum works best when you already have the money and a long time horizon, because every rupee compounds from the start.
- SIP suits a monthly income and lowers the risk of investing everything just before a fall.
- STP (Systematic Transfer Plan) is a middle path: park the lumpsum in a liquid fund and move it into equity in monthly instalments.
- SWP works the other way round: draw a monthly income from a lumpsum. Try the SWP calculator.
Already invested and want to know how it performed? Use the CAGR calculator to find the yearly growth rate from the start and end values, and the capital gains calculator to see the tax when you sell.
Frequently asked questions
What is a lumpsum investment?
A lumpsum investment is a single, one-time investment of a large amount, for example putting a bonus, an inheritance or maturity proceeds into a mutual fund in one go, instead of investing monthly through a SIP.
How is lumpsum return calculated?
The calculator uses the compound interest formula FV = P × (1 + r)^n, where P is the amount invested, r is the expected yearly return and n is the number of years.
Is lumpsum better than SIP?
Neither is always better. A lumpsum invested before a long rise in the market earns more, because all the money compounds from day one. A SIP reduces the risk of investing everything at a market peak. If you have a large amount but are worried about timing, you can move it into equity in parts using a Systematic Transfer Plan (STP).
What return should I assume?
For long-term planning, many investors assume 10–12% a year for equity funds, 7–9% for hybrid funds and 6–7% for debt funds. Actual returns vary from year to year and are not guaranteed.
Does the result include tax?
No. The value shown is before tax. Gains are taxed as capital gains when you redeem, and the rate depends on the type of fund and how long you held it.
Sources
- AMFI – Association of Mutual Funds in India (investor corner)
- SEBI – Securities and Exchange Board of India
Last updated 19 September 2026. Results are estimates for planning only and are not investment, tax or legal advice. See our disclaimer.