What is a Lumpsum Calculator?
A Lumpsum Calculator estimates what a one-time investment could grow to over a period, at a yearly return rate you enter. It shows the amount invested, the estimated gains and the total value.
A lumpsum investment is a single amount invested at once, rather than in instalments. The money compounds for the whole period, so the length of time has a large effect on the result. Market-linked investments do not earn a fixed rate, so treat the figure as one possible outcome.
How to use the Lumpsum Calculator
- Enter investment amount.
- Enter expected return rate.
- Enter time period.
- Tap Calculate to see the result.
- Tap Reset to clear the fields and try again.
Who should use it
- People investing a bonus, inheritance or maturity amount
- Investors comparing a lumpsum with a SIP
- Anyone checking how long-term compounding works
Key terms
- Investment amount
- The single sum you invest at the start.
- Expected return rate
- The yearly return you assume. It is not guaranteed.
- Time period
- How many years the money stays invested.
- Total value
- The estimated value at the end of the period.
Frequently asked questions
Is lumpsum better than SIP?
Neither is always better. A lumpsum is invested at once, while a SIP spreads purchases over time.
Are the returns guaranteed?
No. Market-linked returns vary, and the result depends on the rate you enter.
Does the calculator include tax?
No. The figures are before any capital gains tax.
Can I use it for fixed deposits?
You can, but the FD Calculator lets you choose the compounding frequency, which suits deposits better.
Is my data stored?
No. Everything runs in your browser and nothing is saved.
Last updated: 1 November 2026