Question 1

What is a lumpsum investment, and how is this different from a SIP?

Accepted Answer

A lumpsum investment puts the entire amount to work on day one, versus a SIP which spreads it out in fixed instalments over time. This calculator compounds a single principal amount at your expected annual return; use the SIP Calculator instead if you are investing a fixed amount every month rather than all at once.

Question 2

How is the future value calculated?

Accepted Answer

This calculator uses standard annual compounding: FV = P × (1 + r)ⁿ, where P is your principal, r is the expected annual return as a decimal, and n is the number of years. Each year's value is simply the previous year's value grown by the same rate — the yearly table above shows this compounding step by step.

Question 3

Is a lumpsum investment riskier than a SIP?

Accepted Answer

It can be, in the sense that a lumpsum is fully exposed to whatever the market is doing on the day you invest — if you invest right before a downturn, the whole amount feels that drop immediately. A SIP staggers entry points across market cycles, which smooths out that timing risk, though it does not guarantee a better outcome; over long horizons, being invested longer (as a lumpsum is) has historically outweighed the timing benefit of SIP in many market conditions.

Question 4

Should I invest a windfall as a lumpsum or convert it to a SIP?

Accepted Answer

There is no single right answer, and it depends on your risk tolerance and the market environment. A common middle-ground approach is a 'lumpsum STP' — parking the money in a low-risk instrument and transferring it into equity in instalments over a few months — but that requires a separate tool to model since it blends both mechanics. Compare the flat future-value assumption here against the SIP Calculator's month-by-month build-up to see the trade-off for your own numbers.

Question 5

Does this account for inflation?

Accepted Answer

No — the projected future value here is nominal, not adjusted for inflation. To think in today's purchasing power, you can separately discount the future value by your assumed inflation rate over the same period, or use the Compound Interest Calculator, which includes an inflation-adjustment field.

Question 6

What return rate is realistic for a lumpsum in equities?

Accepted Answer

This varies enormously by market, time period, and asset mix, and past returns are never a guarantee of future ones. Rather than picking a single number, try the calculator at a conservative, moderate, and optimistic rate to see the range of plausible outcomes for your horizon.

Input	Value
Principal	₹5,00,000
Expected return	12% p.a.
Tenure	10 years
Future value	≈ ₹15,52,900

Lumpsum Investment Return Calculator

How the future value is calculated

₹5,00,000 for 10 years at 12%

Common questions