Lumpsum Calculator
Calculate the future value of a one-time lumpsum mutual fund or investment. See maturity value, returns and growth over time with this free lumpsum calculator.
Formula last reviewed 15 September 2026 · How we verify our calculators
Total value
- Invested amount
- ₹1,00,000
- Estimated returns
- ₹2,10,585
Updates live as you type
Frequently asked questions
A lumpsum is a single one-time purchase of mutual fund units at one day's NAV, as opposed to a SIP which buys in monthly instalments. There is no ongoing commitment — everything after the purchase depends on the fund's performance and how long you leave the money undisturbed. It is the natural approach for money that arrives in one piece: a bonus, a maturing deposit, a property sale, gratuity at a job change or an inheritance.
With the compound growth formula M = P x (1 + r)^t, where P is the amount invested, r the expected annual return as a decimal and t the years held. Mutual funds do not credit interest periodically — the NAV simply moves — so annual compounding on the whole sum is the appropriate model. At 12% over ten years, (1.12)^10 = 3.10585, so 1,00,000 becomes 3,10,585.
It depends mainly on whether you actually have a lump sum. If your money arrives monthly from salary, a SIP is the only option and the question is academic. If you already hold the cash, historical evidence slightly favours investing it at once — roughly two-thirds of the time — because markets rise more often than they fall and uninvested money earns nothing meanwhile. What a SIP buys in that situation is protection against investing everything the week before a fall, which many people value more than the small expected cost.
No, and that is the single largest caveat. The calculator applies a steady annual return, whereas real equity funds deliver something like +30%, -12%, +7%, +22% in sequence. Over long horizons the endpoint tends to be similar, but the path includes stretches — sometimes lasting years — where the value sits below what you invested. Run the projection at 10% and at 14% as well, and plan against the lower figure rather than the headline one.
Usually not. The cost of waiting is certain and continuous — cash earning 3% while equities compound at a higher rate — while the benefit of better timing is uncertain and rare. In practice most investors who wait for a dip either never see the one they imagined or fail to act when it arrives, because a falling market feels like the worst possible moment to buy. If the size of the investment worries you, a staggered entry over three to six months is a better answer than waiting.
A Systematic Transfer Plan parks your lump sum in a liquid or ultra-short debt fund and moves a fixed amount into an equity fund each month, typically over six to twelve months. It is the middle path between investing everything at once and dripping money in from salary. You give up a little expected return relative to a pure lumpsum, and in exchange you remove the worst-case outcome of buying the entire position at a peak. For sums that materially change your financial position, that trade is usually worth making.
For equity funds, gains on units held beyond twelve months are long-term, taxed at 12.5% above a 1,25,000 annual exemption; held less than twelve months they are short-term at 20%. A lumpsum is simpler than a SIP here because there is a single purchase date, so the whole holding crosses into long-term treatment at once rather than in monthly tranches. On a 1,00,000 investment that grows to 3,10,585, the 2,10,585 gain less the exemption leaves about 85,585 taxable.
More than most people assume, and the effect compounds with time. On 1,00,000 over ten years: 10% gives 2,59,374, 12% gives 3,10,585 and 14% gives 3,70,722. A two-point error moves the result by roughly a sixth over ten years and far more over twenty. This is why the return you enter should be a long-run assumption net of the fund's expense ratio, not a recent three-year performance figure extrapolated forward.
Not in equity. For money needed within about three years, a single equity purchase carries real risk of being below your cost exactly when you need to sell, with no time to recover. Debt funds, arbitrage funds or a fixed deposit are the appropriate vehicles for that horizon, and conveniently their low volatility also means entry timing barely matters. The lumpsum approach in equity needs roughly seven years or more before a poorly timed entry stops being a serious concern.
One deposit, left alone
Invest ₹1,00,000 once at an expected 12% and leave it for ten years: it becomes ₹3,10,585. You add nothing along the way. The entire ₹2,10,585 of growth comes from the original sum earning returns, and then those returns earning returns. Leave it twenty years instead and it reaches ₹9,64,629 — the second decade adds ₹6.5 lakh against the first decade's ₹2.1 lakh, on identical money at an identical rate.
A lumpsum investment is a single purchase of mutual fund units, made at one point in time at one NAV. There is no averaging, no schedule and no ongoing commitment. Everything afterwards is determined by the fund's performance and by how long you leave it undisturbed.
That makes it the natural home for money that arrives in one piece: a bonus, maturing deposit, property sale, inheritance, or gratuity at a job change. It also makes the entry point matter more than it does in a SIP. You are buying everything at one day's price, so a purchase immediately before a sharp fall genuinely hurts in a way that a staggered purchase would not. Over long horizons this risk shrinks — but it does not disappear, and it is the honest cost of the approach.
How the projection is built
A lumpsum is pure compound growth with no further contributions:
M = P × (1 + r)ᵗ
- M — the maturity value.
- P — the amount invested today.
- r — the expected annual return as a decimal, so 12% is 0.12.
- t — the holding period in years.
Returns here are ₹M − P.
Mutual funds do not credit interest periodically; the NAV simply moves. So the appropriate model is annual compounding on the whole sum, with no separate compounding-frequency input to choose. The exponent t carries the entire effect: each year multiplies the previous year's ending value by (1 + r), so growth is proportional to a balance that is itself growing.
This is why the same absolute gain is produced faster and faster as time passes. Going from ₹1 lakh to ₹2 lakh at 12% takes about six years. Going from ₹8 lakh to ₹16 lakh takes the same six years — but adds ₹8 lakh instead of ₹1 lakh.
Ten years at 12%, year by year
P = 1,00,000, r = 0.12.
Year 1. 1,00,000 × 1.12 = ₹1,12,000. Gain: ₹12,000.
Year 2. 1,12,000 × 1.12 = ₹1,25,440. Gain: ₹13,440.
Year 3. 1,25,440 × 1.12 = ₹1,40,493. Gain: ₹15,053.
Year 5. ₹1,76,234.
Year 7. ₹2,21,068.
Year 10. ₹3,10,585. The final year alone added ₹33,277 — more than two and a half times the first year's gain, from the same rate.
Directly: (1.12)¹⁰ = 3.10585, so 1,00,000 × 3.10585 = ₹3,10,585.
Against a SIP. A fair comparison uses the same total money. ₹1,00,000 invested at once for ten years at 12% gives ₹3,10,585. The same ₹1,00,000 spread as roughly ₹8,333 a month over the first year, then left, would end lower — because most of it was invested later and compounded for less time. Historically, lump-sum investing beats staggering roughly two-thirds of the time, for exactly this reason: markets rise more often than they fall, so waiting usually costs more than it protects.
The sensitivity to the rate. At 10% rather than 12%, the ten-year result is ₹2,59,374 — about ₹51,000 less. At 14% it is ₹3,70,722. A two-point error in either direction moves the outcome by roughly a sixth. Treat the projection as a band, not a point.
When a lumpsum makes sense
When you already hold the money. Cash in a savings account earning 3% while you wait for a better entry is a guaranteed loss against a possible one.
When the horizon is genuinely long. Seven years and beyond gives even a poorly-timed entry room to recover.
For rebalancing or switching. Moving between funds or asset classes is inherently a lumpsum action.
For debt funds and arbitrage funds, where volatility is low enough that entry timing is close to irrelevant.
It fits badly when the money is needed within three years, and when the sum is large relative to your total net worth — investing your entire savings on a single day is a concentration of timing risk that a staggered entry over three to six months materially reduces. That middle path, a Systematic Transfer Plan, parks the money in a liquid fund and moves a fixed amount into equity each month. It gives up a little expected return for a meaningful reduction in regret risk.
Reading the projection
The maturity figure is pre-tax and pre-inflation, and both corrections are large over long horizons.
Tax. Equity fund gains held beyond twelve months are long-term, taxed at 12.5% above a ₹1.25 lakh annual exemption. On the ten-year example, the ₹2,10,585 gain less ₹1,25,000 leaves ₹85,585 taxable — roughly ₹10,698 of tax plus cess. Unlike a SIP, a lumpsum has a single purchase date, so the entire holding crosses into long-term treatment at once, which is simpler and usually cheaper.
Inflation. ₹3,10,585 in ten years, at 6% inflation, has the purchasing power of about ₹1,73,400 today. Still a real gain on ₹1,00,000, but a far more sober one than the headline triple.
The most useful reading is the returns line as a multiple of what you invested. At 12% over ten years you roughly triple; over twenty you multiply by 9.6. That non-linearity, not the annual rate, is what long-term investing actually trades on.
Common errors
Waiting for a better entry. The cost of sitting in cash is certain and continuous; the benefit of better timing is uncertain and rare. Most investors who wait for a dip either miss it or fail to act when it arrives.
Extrapolating a recent return. Entering 18% because a fund returned that over the past three years projects a bull market forward indefinitely. Use a long-run assumption, and stress-test it downward.
Forgetting the expense ratio. The rate you enter should be net of fund charges. A 1% expense ratio over twenty years removes roughly a sixth of the final corpus.
Investing the emergency fund. A lumpsum is only sound if you will not need the money at a bad moment. Without a separate cash buffer, a market fall and a car repair in the same month force a sale at the worst price.
Treating a maturity figure as a promise. The arithmetic is exact; the 12% is an assumption you supplied. Real equity returns arrive as a jagged sequence that averages out only over long periods.
Putting everything in on one day out of impatience. For a sum that materially changes your financial position, spreading entry across a few months costs little in expected terms and removes the single worst outcome.
Judging the decision by what happened next. A lumpsum invested a month before a 20% fall was not a bad decision, and one invested a month before a 20% rally was not a good one — both were the same decision facing an unknowable future. Evaluating investment choices by their outcome rather than by whether they were sensible given what you knew is how people end up abandoning sound approaches after one unlucky entry, and chasing poor ones after a lucky one.