Lumpsum Calculator
What a one-time investment grows to over the years, compounded annually.
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When a lumpsum calculation is the right one
A lumpsum investment is a single deposit left to grow — a bonus, a maturing deposit, proceeds from a property sale, an inheritance. Because there is only one contribution, the maths is simpler than a SIP and the outcome depends almost entirely on two things: the rate of return and how long you leave it alone.
The compound growth formula
A = P × (1 + r)t
Where P is the amount you invest, r is the annual rate expressed as a decimal, and t is the number of years. This calculator compounds annually, which is the convention for equity and mutual fund projections. Bank products that compound quarterly or monthly will produce slightly higher figures for the same headline rate — use the fixed deposit calculator for those.
A worked example
Invest 5,00,000 at 12% for 10 years and it becomes roughly 15,52,900. Your money has slightly more than tripled without you adding a rupee. Extend the same investment to 20 years and it reaches about 48,23,100 — not double the ten-year figure but more than three times it, because in the second decade the returns are themselves earning returns.
This is worth internalising: doubling the time does far more than doubling the money. The rule of 72 gives you a quick mental version — divide 72 by your return rate to find the approximate years to double. At 12%, money doubles roughly every six years.
How to use this calculator well
The most common mistake is entering an optimistic rate and then treating the output as a plan. Run three versions: pessimistic, expected, and optimistic. If the pessimistic number still meets your goal, the plan is robust. If only the optimistic number works, you need either more time, more capital, or a different goal.
Also consider whether a lumpsum is the right approach at all. If you are holding a large sum and markets look stretched, some investors stagger the entry over several months through a systematic transfer plan, which parks the money in a liquid fund and moves a fixed amount into equity each month. It sacrifices some upside for a smoother entry.
What is not included
The projection is pre-tax and excludes fund expense ratios, exit loads, and inflation. A corpus that looks large in twenty years will not buy twenty years' worth of today's goods — run the same figure through the inflation calculator to see the difference in purchasing power. That comparison is uncomfortable but far more useful than the raw number alone.
Frequently asked questions
What is the difference between lumpsum and SIP?
A lumpsum is one investment made at a single point in time. A SIP spreads the same total across many monthly instalments. Lumpsum benefits from being fully invested from the start; a SIP benefits from averaging your purchase price across market highs and lows.
Does this calculator compound annually or monthly?
Annually, which matches the standard convention for mutual fund and equity return projections. Monthly compounding at the same headline rate would produce a marginally higher result.
Should I invest a lumpsum all at once?
It depends on your time horizon and tolerance for a bad first year. Historically, investing immediately has beaten staggered entry more often than not, simply because markets rise more often than they fall. But if a 20% drop soon after investing would cause you to sell, staggering the entry is the safer choice for you specifically.
Is the maturity amount taxable?
Gains are taxable when you redeem, with the rate depending on the asset type and how long you held it. The figure shown here is before any tax.
What return rate is realistic for a lumpsum?
It depends entirely on where the money goes. Equity funds have historically averaged 10–14% over long periods with significant year-to-year variation; debt funds and fixed deposits sit in the 6–8% range with much less variation.