SIP vs Lumpsum Calculator (Systematic Investment Plan)

SIP invests a fixed amount every month, while lumpsum invests the entire amount at once. Both grow through compounding, but perform differently depending on market conditions and timing — this calculator compares the two side by side using the same assumed rate of return, so you can see the pure mathematical difference between staggered and one-time investing.

This decision comes up most often when someone receives a windfall — a bonus, a maturing fixed deposit, an inheritance, or proceeds from selling an asset — and has to decide whether to deploy it all at once or spread it out over time. Neither approach is universally "better"; it depends heavily on market conditions during the investment period, which this calculator's fixed-rate assumption can't predict.

To model just the monthly SIP side of this decision on its own, see the main SIP Calculator. To model just the lumpsum side, use the Lumpsum Investment Calculator, which offers more detail on a single one-time investment's growth.

The lumpsum grows on the full amount from day one, compounding for the entire duration. The SIP, by contrast, invests smaller amounts progressively — each installment gets less time to compound than the one before it. This is why a lumpsum invested at the start of a rising market often outperforms an equivalent SIP, while SIP tends to do better when markets are volatile or declining early on.

It's important to understand what "equivalent" means here: this calculator lets you enter a monthly SIP amount and a separate lumpsum amount independently, so the two totals invested over the period usually aren't the same unless you deliberately set them that way (monthly SIP × months = lumpsum). Under one constant, unchanging rate of return, a lumpsum invested on day one will mathematically always beat a SIP of the same total committed amount, simply because more money has spent more time compounding — the real debate between SIP and lumpsum is really about whether markets will actually behave that predictably, which they rarely do.

Both figures assume the same fixed annual return, so the comparison mainly illustrates the mathematical effect of investing all at once versus gradually — it does not account for the real-world uncertainty of when markets will rise or fall, which is the actual reason SIP and lumpsum often perform differently in practice.

In practice, whichever number comes out higher here shouldn't be read as "the right choice" — it only tells you what would happen if the market delivered a smooth, constant return the entire time. Real markets move in unpredictable cycles, and that unpredictability, not the math shown here, is the actual reason many investors prefer SIP for money they don't want to risk deploying at a single bad moment.