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💵 Lump Sum Investment Calculator

Calculate the future value of a one-time lump sum investment with different compounding frequencies. See how compounding frequency affects your final returns over time.

Compound Interest Formula

FV = P × (1 + r/n)^(n×t)

P = principal (lump sum), r = annual rate, n = compounding periods per year, t = years. More frequent compounding = slightly higher returns due to interest-on-interest.

How to Use This Calculator

  1. 1
    Enter Lump Sum
    The one-time amount you invest today — an inheritance, bonus, savings, or windfall.
  2. 2
    Enter Annual Return Rate
    Expected annual return %. Use 7-10% for diversified stock portfolios, 4-5% for bonds.
  3. 3
    Select Compounding
    Monthly compounding is most common for investments. Daily compounding yields slightly more than annual.
  4. 4
    Review Growth Table
    The first 10 years of growth are shown in detail, with annual gain and total gain columns.

Real-World Example

Invest a $50,000 inheritance at 10% annual return, monthly compounding, for 20 years.

FV = $50,000 × (1 + 0.10/12)^(12×20)
FV = $50,000 × (1.00833)^240
FV ≈ $370,000+
Total Gain ≈ $320,000 from compounding

Frequently Asked Questions

Research by Vanguard found that lump sum investing outperforms DCA about 2/3 of the time because markets tend to rise over time. However, DCA reduces regret risk if markets fall right after you invest.

At typical return rates, the difference between monthly and daily compounding is very small (under 0.1%). The main variable that matters is the annual return rate.

In taxable accounts, you can access money anytime. In tax-advantaged accounts (401k, IRA), early withdrawal before age 59½ typically incurs a 10% penalty plus income taxes.

To get the real (inflation-adjusted) future value, use a real return rate: real rate = ((1 + nominal) / (1 + inflation)) - 1. For 10% nominal with 3% inflation, the real rate is about 6.8%.

A quick way to estimate doubling time: 72 ÷ annual return % ≈ years to double. At 10% return, money doubles every 7.2 years. At 7%, every ~10.3 years.

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