How to use the Lumpsum Calculator
- Enter the one-time amount you plan to invest.
- Enter the yearly return you expect. Use a cautious figure rather than the best year you have seen.
- Enter the number of years you will stay invested.
- Read the future value, the total invested and the estimated returns. Scroll down for the year-by-year table.
Formula used
Future value = P × (1 + r)ⁿ, where P is the amount invested, r is the yearly return as a decimal and n is the number of years.
Worked example
Here is the Lumpsum Calculator worked through with the example values shown above, so you can check each step by hand.
| Inputs | |
|---|---|
| Investment amount | ₹1,00,000 |
| Expected return (per year) | 12 % |
| Time period | 10 years |
| Result | |
| Estimated future value | ₹3,10,585 |
| Amount invested | ₹1,00,000 |
| Estimated returns | ₹2,10,585 |
Year-by-year growth
Value of the default lumpsum at the end of each year. Because returns compound, the gain added each year keeps getting larger.
| Year | Value | Returns so far |
|---|---|---|
| 1 | ₹1,12,000 | ₹12,000 |
| 2 | ₹1,25,440 | ₹25,440 |
| 3 | ₹1,40,493 | ₹40,493 |
| 4 | ₹1,57,352 | ₹57,352 |
| 5 | ₹1,76,234 | ₹76,234 |
| 6 | ₹1,97,382 | ₹97,382 |
| 7 | ₹2,21,068 | ₹1,21,068 |
| 8 | ₹2,47,596 | ₹1,47,596 |
| 9 | ₹2,77,308 | ₹1,77,308 |
| 10 | ₹3,10,585 | ₹2,10,585 |
How the lumpsum formula works
The future value is P × (1 + r)ⁿ. Each year the balance is multiplied by (1 + r), so growth is applied to the earlier growth as well as to your original money. With ₹1,00,000 at 12% for 10 years the calculation is 1,00,000 × 1.12¹⁰ = ₹3,10,585, which means ₹2,10,585 of the final amount is returns.
Because the growth is exponential, the later years add far more rupees than the early ones. In the default example the first year adds ₹12,000, while the tenth year adds ₹33,277.
What time and return do to the result
The table below shows ₹1,00,000 at 12% for different periods: 5 years gives ₹1,76,234, 10 years gives ₹3,10,585, 15 years gives ₹5,47,357, 20 years gives ₹9,64,629 and 25 years gives ₹17,00,006. Doubling the time from 10 to 20 years does not double the money, it nearly triples it.
The return matters just as much. Over 10 years ₹1,00,000 becomes ₹2,15,892 at 8%, ₹2,59,374 at 10%, ₹3,10,585 at 12% and ₹4,04,556 at 15%. A rough shortcut is the rule of 72: divide 72 by the yearly return to estimate the years needed to double your money. At 12% that is about 6 years.
Lumpsum or SIP?
A lumpsum puts all your money to work from day one, so it has more time to compound. A SIP spreads the same money across many months, which reduces the risk of investing everything just before a market fall and suits people who earn monthly. If you already hold a large amount, some investors split it into several parts and invest them over a few months. The right choice depends on your cash, your time horizon and how you handle market swings.
You can compare the two directly by running the same total through the SIP calculator on this site.
Limits of this calculator
The result assumes the same return every single year. Real market-linked investments go up and down, and a poor first few years can change the final figure a lot. The calculation is before tax, fees and exit loads, and it does not adjust for inflation. Tax rules on gains differ by product and change from time to time, so check the current rules or speak to a qualified adviser.
Use the result to compare scenarios, not as a promise of what you will receive.
Frequently asked questions
How is the lumpsum return calculated?
The amount is multiplied by (1 + yearly return) once for every year. For 12% over 10 years, the multiplier is 1.12 raised to the power 10, which is about 3.106.
What return should I enter?
Use a realistic long-term figure for the type of investment. Equity returns vary widely from year to year, so try several values such as 8%, 10% and 12% rather than relying on one.
Does this include tax and charges?
No. The result is before tax, expense ratios, exit loads and other charges, all of which reduce what you actually keep.
Is a lumpsum better than a SIP?
Neither is always better. A lumpsum gives more time in the market, while a SIP spreads timing risk and fits monthly income. Compare both for your situation.
Can I enter a period that is not a whole number of years?
Yes. The formula works with decimals, so 7.5 years is valid. The year-by-year table shows whole years only.
Are the returns guaranteed?
No. The calculator assumes a constant return for illustration. Actual returns on market-linked products can be higher, lower or negative.
This calculator gives estimates for information only. Actual figures from a bank, employer, tax authority or doctor may differ. It is not financial, tax, legal or medical advice.