What is a lumpsum calculator?

It projects the future value of a single one-time investment held for a set number of years at an assumed annual rate of return, and splits the result into your principal and the estimated growth on it.

What is the formula for lumpsum returns?

A = P × (1 + r)ⁿ, where P is the amount invested, r is the annual rate as a decimal and n is the number of years. The estimated return is simply A − P.

Is a lumpsum better than a SIP?

Neither is universally better — they answer different questions. A lumpsum puts the whole amount to work immediately, which helps when markets rise from your entry point and hurts when they fall. A SIP spreads entry across months. Which suits you depends on whether you already hold the money and how much short-term fluctuation you can accept.

Are these returns guaranteed?

No. The figure is a projection at the rate you entered. Market-linked investments have no assured return, and the value can fall below what you invested, particularly over short periods.

Does this calculator include tax?

No. The projected value is before capital gains tax, exit loads and any transaction charges, so your realised amount will be lower.

How do I compare a lumpsum result with an actual investment?

Use the CAGR calculator. Enter what you invested and what it is worth now to get the annualised rate actually achieved, then compare it against the rate you assumed here.

Investment · FINANCIAL TOOLS

Lumpsum Calculator

See how a single one-time investment could compound over a chosen number of years.

Understand the calculation

Calculation logic, formula, example and guardrails behind the estimate.

How it works

A lumpsum projection applies compound growth to a single amount. Each year's closing value becomes the base the next year grows on, so growth accelerates even though the rate never changes.

This calculator compounds annually — the assumed rate is applied once per year for the number of years you enter. Funds that compound more frequently produce marginally higher figures for the same nominal rate.

More detail

Because nothing is added after the start, the principal line in the chart stays flat. Everything above it is projected return, and the gap between the two widens with time rather than with the amount invested.

Time is the input that changes the answer the most. Doubling the amount doubles the outcome, but doubling the period multiplies it — which is why the holding-period scenario table below is usually the more interesting one.

If you plan to add to the investment regularly as well, use the compound interest calculator.

To find the rate an investment you already hold has actually achieved, use the CAGR calculator.

Formula

A = P × (1 + r)ⁿ

This applies annual compounding. For monthly compounding at the same nominal rate, the base becomes (1 + r ÷ 12) and the exponent n × 12, which gives a slightly higher result.

A: Final value — the projected amount at the end
P: Principal — the one-time amount invested at the start
r: Annual rate of return as a decimal (12% is entered as 0.12)
n: Number of years the money stays invested

Worked example

₹1,00,000 invested once for 10 years at an assumed 12% annual return.

01Principal (P)₹1,00,000
02Rate (r)12% = 0.12
03Years (n)10
04Growth factor(1.12)¹⁰ ≈ 3.1058
05Final value (A)₹1,00,000 × 3.1058 ≈ ₹3,10,585
06Estimated returns₹3,10,585 − ₹1,00,000 ≈ ₹2,10,585

The projected returns are roughly twice the principal. Extending the same investment to 20 years at the same rate would take the growth factor to about 9.6 — the extra decade contributes far more than the first one.

Important considerations

01
Entry timing affects a lumpsum more than a SIP
The entire amount is exposed to the market on day one, so a lumpsum has no averaging effect. A poor entry point takes longer to recover from than it would with instalments spread across months.
02
A constant rate hides real volatility
The chart shows a smooth curve because the rate never changes. An actual equity investment reaching the same end value would take a far bumpier path, including years where the value falls.
03
Compounding frequency changes the number
This calculator compounds once a year. Products quoting the same nominal rate with quarterly or monthly compounding will show a higher maturity value, so compare on effective annual rate rather than headline rate.
04
Results are before tax and inflation
Capital gains tax applies on redemption, and inflation reduces what the final amount buys. Both are excluded here, so treat the output as a gross nominal figure.
05
Guaranteed products need different assumptions
If you are modelling a fixed deposit or a bond rather than a market-linked fund, use the contracted rate and remember interest is usually taxable at your slab rate.

Limitations

It assumes one constant annual return, so the smooth curve it draws is nothing like the path a real market-linked investment takes.
It compounds once a year. Products quoting the same nominal rate with monthly or quarterly compounding will end slightly higher.
The result is nominal and pre-tax, so it overstates what you would actually be able to spend.
It says nothing about entry timing, which affects a lumpsum far more than it affects instalments spread over months.

Frequently asked questions

Common questions about the lumpsum calculator and the assumptions behind it.

Next useful checks

Move from this result to the next decision without hunting through the full calculator list.

Goal-Based SIP CalculatorTurn a target amount into a monthly investment.SIP vs Lumpsum CalculatorCompare investing all at once against monthly investing.CAGR CalculatorConvert start and end values into an annual return.

Related calculators

Other tools that answer questions close to this one.

All investment calculators

Investments

SIP Calculator

Project what a fixed monthly mutual fund SIP could grow to at an assumed rate of return.

Open calculator

Investments

SIP vs Lumpsum Calculator

Compare investing an amount all at once against spreading it over monthly instalments, on equal terms.

Open calculator

Investments

Compound Interest Calculator

Combine a starting amount with regular contributions to see how compounding builds on both.

Open calculator

Investments

CAGR Calculator

Find the annualised growth rate between what an investment started at and what it is worth now.

Open calculator

Investments

Step-up SIP Calculator

Model a SIP that increases by a fixed percentage every year and compare it with a level SIP.

Open calculator

Investments

Inflation Calculator

See what today's money would cost in future, and what it would still buy if left uninvested.

Open calculator

Browse all calculators

Disclaimer

This calculator is provided for general information and planning only. It is not investment, tax or legal advice, and it does not take your personal circumstances into account. Outputs are estimates based on the assumptions stated on this page, exclude taxes and charges unless said otherwise, and market-linked returns are not guaranteed — the value of investments can fall as well as rise. Lending terms, rates and eligibility are decided by the lender. For advice on your own situation, speak to a qualified professional, several of whom you can consult on Finvestalk.