Lump Sum Calculator

How to use it

A lump-sum investment is a single amount invested all at once — a bonus, an inheritance, or the proceeds from selling an asset, for example — and left to grow untouched for a set period, rather than contributed gradually like a SIP. Use this calculator when you already have the full amount in hand and want to see what it could be worth by a future date, or when comparing a one-time investment against spreading the same money out over time. The calculation uses the standard compound interest formula for a single deposit: future value equals the principal multiplied by (1 plus the annual rate as a decimal), raised to the power of the number of years — FV = P × (1 + r)^t, where P is your initial amount, r is the annual return expressed as a decimal (12% becomes 0.12), and t is the number of years invested. This calculator compounds annually, since that's the standard way lump-sum returns are quoted and compared. For example, investing $100,000 at an expected 12% annual return for 10 years: (1 + 0.12)^10 works out to about 3.1058, so the future value is $100,000 × 3.1058 ≈ $310,585. Your original $100,000 stays invested throughout, and the remaining $210,585 is the return generated purely by compounding — more than double what the same amount would earn at simple, non-compounding interest. People use a lump-sum calculator to plan around a windfall — a bonus, a maturity payout from another investment, or inherited money — and decide whether to invest it all now or phase it in gradually. It's also useful for comparing scenarios: entering the same principal at different expected rates shows how sensitive the outcome is to the return you assume, and comparing this calculator against the SIP calculator shows the difference between investing everything on day one and investing gradually. As with any projection, the rate you enter is an assumption; real returns vary, and this tool is not financial advice.

Frequently asked questions

What is a lump-sum investment?

A lump-sum investment is a single, one-time amount you invest all at once — such as a bonus, inheritance, or maturity payout — rather than spreading it out over time the way a SIP does. The whole amount starts compounding from day one, which is why timing and the return rate you choose have a bigger effect on the outcome than with a SIP.

SIP or lump sum — which is better?

It depends on the market and your risk tolerance. A lump sum tends to do better in markets that rise steadily, because the full amount compounds from day one. A SIP spreads your investment across market ups and downs (rupee-cost averaging), which can reduce the impact of poor timing in volatile markets. Many investors use both — a lump sum for money they already have, and a SIP for new income.

How often does this calculator compound interest?

This calculator compounds annually, which is the standard way lump-sum mutual fund and stock market returns are quoted. If you're comparing against a bank product that compounds quarterly or monthly — like a fixed deposit — use the FD calculator instead, since more frequent compounding produces a slightly higher final value for the same quoted annual rate.

Should I invest a lump sum all at once or split it up?

There's no universally correct answer — it depends on market conditions and your comfort with risk. Investing the full lump sum immediately maximizes time in the market, which historically wins more often than not. Splitting it into several tranches over a few months (sometimes called SIP-ing a lump sum) reduces the risk of investing everything right before a downturn, at the cost of some expected return.