— Investment
Lumpsum Investment Calculator
Invest a single amount once and let it compound — see what it grows to, and how much of the result is gains.
Maturity value in 10 years
$310,584.82
- Total invested
- $100,000
- Total gains
- $210,584.82
- Total return
- 210.58%
— Year by year
| Year | Year-end value | Cumulative gains |
|---|---|---|
| 1 | $112,000 | $12,000 |
| 2 | $125,440 | $25,440 |
| 3 | $140,492.8 | $40,492.8 |
| 4 | $157,351.94 | $57,351.94 |
| 5 | $176,234.17 | $76,234.17 |
| 6 | $197,382.27 | $97,382.27 |
| 7 | $221,068.14 | $121,068.14 |
| 8 | $247,596.32 | $147,596.32 |
| 9 | $277,307.88 | $177,307.88 |
| 10 | $310,584.82 | $210,584.82 |
— Invested vs gains
Download— How it works
FV = P (1 + r/m)^(m·t); P = amount, r = return net of fees, m = compounds per year, t = years
How a lumpsum grows
A lumpsum investment is a single amount invested once and left to compound. Unlike a recurring plan, every penny is working from day one, so the whole sum compounds for the full term — which is why a lumpsum invested early can outgrow a larger amount drip-fed in later. This calculator grows your amount at the expected return you set and splits the result into the original investment and the gains it earned.
The growth follows FV = P(1 + r/m)^(m·t): your principal stays flat while the gains band builds on top of it and steepens, because each year’s growth is calculated on a larger balance. That compounding curve — slow at first, then sharply upward — is the whole story, and the chart’s gains band is where you can see it. Because there is no live price feed, the expected return is your assumption; real markets vary, so treat the figure as a central estimate.
Worked example — $100,000 at 12% for 10 years, compounded annually: FV = 100,000 × 1.12^10 ≈ $310,585. So about $210,585 is gains — more than twice what you invested — and the original $100,000 is just under a third of the final pot.
Compounding frequency and the CAGR
Compounding frequency is how often returns are added back to the balance. More frequent compounding lifts the result a little: the same 12% compounded monthly rather than annually reaches a slightly higher figure, because gains start earning gains sooner. The effect is real but modest next to the rate and the time horizon.
When you compound more often than yearly, or apply an expense ratio, the rate your money actually earns drifts away from the figure you typed in. The CAGR — compound annual growth rate — captures that realised yearly rate. With monthly compounding it sits a touch above the nominal rate; with an expense ratio it sits below, since the fee is taken off the return.
Fees, inflation and tax
The expense ratio is a fund’s annual fee, charged on your whole holding; the cleanest way to model it is to subtract it from the return, so a 12% return with a 1% expense ratio compounds at 11%. Over a long hold that small gap removes a meaningful slice of the final value.
Two more toggles keep the figure honest. Inflation discounts the maturity value back to today’s purchasing power; a tax rate applied to the gains shows what you would keep after capital-gains tax. Both are optional and off by default.
Lumpsum, SIP or compound interest?
Use this when you have a single amount to invest now. If you would rather invest a fixed sum every month, the SIP calculator models that, and the Mutual Fund Return calculator combines a lumpsum and a SIP as explicit modes with fund costs and tax. For a plain savings or deposit balance — especially with regular top-ups — the Compound Interest calculator is the more general tool.
— Reader questions
What is a lumpsum investment?
A single one-time amount invested all at once and left to grow, rather than contributed gradually. Because the whole sum compounds for the full term, it puts every part of your money to work from the start.
Is a lumpsum better than a SIP?
If you already hold the money, investing it as a lumpsum has historically beaten spreading it out more often than not, simply because it is exposed to growth sooner. The trade-off is timing risk: a lumpsum invested just before a downturn feels worse than a SIP. For money arriving from income, a SIP is the natural fit.
Does compounding frequency change the result much?
Less than most people expect. The same nominal rate compounded monthly rather than annually lifts a long-term result by only a little, and daily compounding adds barely anything more. The return rate and the number of years do the heavy lifting.
Why is the CAGR different from the return I entered?
The CAGR is the rate your money effectively earned per year. Compounding more often than yearly nudges it above the nominal rate you typed; an expense ratio pulls it below, because the fee is deducted from the return. With annual compounding and no fee, the CAGR equals your input.
How does the expense ratio affect the maturity value?
It is subtracted from the return, so a 12% return with a 1% expense ratio compounds at 11%. Over many years that gap removes a surprisingly large share of the final value, which is why low-cost funds matter for long holds.
Does this use live market data?
No. It grows your amount at the steady expected return you enter, not a live or historical price path. Real returns vary year to year, so treat the output as an estimate rather than a forecast.