Lumpsum Investment Calculator
Project the future value of a one-time investment at an expected annual return.
A lumpsum investment is the simplest wealth-building move there is: invest once, let compounding run. Yet intuition consistently underestimates the result, because exponential growth back-loads its gains — the last five years of a 20-year investment typically generate more than the first fifteen combined.
This calculator projects the future value of a one-time investment for any expected annual return and time horizon, and shows the total gain over your principal. Use it to model a mutual fund lumpsum, an inheritance you plan to park in an index fund, or to compare against an SIP of equivalent total contribution.
How to use Lumpsum Investment Calculator
- 1
Enter the investment amount
The one-time amount you plan to invest.
- 2
Set the expected annual return
Equity index funds have historically returned 10–12% over long periods; nothing is guaranteed.
- 3
Set the time horizon
The number of years you'll stay invested.
Features
- Compound growth projection for any return and horizon
- Shows absolute gain over the principal
- Instant what-if comparisons as you adjust inputs
Frequently asked questions
Common mistakes to avoid
- Projecting recent bull-market returns (15–20%) far into the future.
- Ignoring taxes and fund expense ratios, which compound against you just as returns compound for you.
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