FINBIZTOOLS
Lumpsum Calculator
Estimate the future value of a single investment left untouched for a set period. Enter the amount, an assumed annual return and the number of years to see the final value, the growth and a year-by-year table.
Private by design · Inputs and downloads stay in your browser
Changes the currency symbol and number format only. Amounts are not converted.
This calculator provides an estimate based on the assumptions entered and does not guarantee investment returns.
How to use the Lumpsum Calculator
- Enter the one-time investment amount.
- Enter the expected annual return as a percentage. Values from −99% to 100% are accepted, so you can test a loss.
- Enter the investment duration in years. Fractions are allowed, for example 2.5.
- Select Calculate to see the final value and the growth or loss, then review the year-wise table.
Use the currency selector above the inputs to change the symbol. It changes the display only and does not convert amounts.
What is a lump sum investment?
A lump sum investment puts the whole amount to work at one time, in contrast to a SIP that feeds money in gradually. With nothing added or withdrawn, the outcome depends only on the amount, the rate and the time.
Compounding means each year's growth is added to the balance that then earns the next year's growth, so the same rate produces larger gains the longer the money stays invested.
How the calculation works
Lumpsum formula
Future value = A × (1 + R)^t
- A is the amount invested.
- R is the annual return as a decimal, so 10% is 0.10.
- t is the duration in years and may include a fraction.
Growth is compounded once a year, and fractional years use the same exponent. The year-wise table applies the formula to each whole year and finishes with the exact final period.
Lumpsum calculation example
Investing 100,000 once, with a 10% annual return assumed for 5 years:
| Initial investment | 100,000 |
|---|---|
| Expected annual return | 10% |
| Duration | 5 years |
| Total invested | 100,000 |
|---|---|
| Estimated growth | 61,051 |
| Final value | 161,051 |
Amounts are shown without a currency symbol because the arithmetic is identical in any currency. The currency selector only changes the symbol and number format; it never converts amounts.
Assumptions and limitations
Assumptions
- One investment at the start, with no additional deposits or withdrawals.
- A constant annual return with annual compounding.
- No adjustment for inflation.
Limitations and why results can differ
- A constant rate hides the ups and downs of real returns, and the order of good and bad years matters in practice.
- Fees, taxes and exit charges are not deducted.
- The calculator shows one assumed path, not a range of possible outcomes.
Frequently asked questions
How often is the return compounded?
Once a year. Fractional years use the same formula with a fractional exponent.
Can I enter a negative return?
Yes, down to −99%, which shows the effect of a loss on the final value.
Can I enter a period shorter than a year?
Yes. Enter a fraction, for example 0.5 for six months.
How does this differ from a SIP?
A lump sum is invested all at once, whereas a SIP adds money in instalments. Use the SIP Calculator to compare a monthly plan with a single deposit.
Methodology
Inputs are validated: amount from 0.01 to 1,000,000,000, annual return from −99% to 100% and duration from 0.01 to 60 years, with fractions allowed.
The final value is the amount multiplied by (1 + return) raised to the number of years. Each whole year is tabulated the same way, followed by the exact final period. Growth is the final value minus the amount. Rounding is applied only for display. The calculation runs in your browser and inputs are not sent to a server.
Last reviewed:
Disclaimer
Results are estimates based on the assumptions you enter and do not guarantee future returns. This page is for information only and is not financial, investment or tax advice. Read the full Disclaimer.
Explore this topic
This tool is part of Investing and Saving.
A common order: set a savings goal, project growth with regular or lump-sum investing, then adjust for inflation.
Free spreadsheet template
- SIP Investment Planner (XLSX, free) — Keeping a long-term SIP plan with your own assumptions in one file.