Free DCA & Compound Interest Calculator

Model dollar-cost averaging with transparent formulas, live examples, and interactive charts to understand compound growth over time.

Free Tool
No Sign-Up Required
Interactive Charts
Formula + Example

Parameters

Adjust inputs or sliders to project your DCA outcome.

$1,000
$500
10 Years
8%

S&P 500 historical average is ~10%.

Growth Projection

Estimated value after 10 years.

$94,302
+$33,302 growth
Portfolio Value
Contributions
012345678910$0k$25k$50k$75k$100k
Years
Total Invested
$61,000
Total Growth
$33,302
Growth Multiple
1.55x
Est. Monthly Compounding
$629

How This DCA Calculator Works

Dollar-cost averaging (DCA) invests on a schedule instead of trying to time the perfect entry. This projection uses a fixed annual return with monthly contributions.

"Compound interest is the eighth wonder of the world. He who understands it, earns it; he who doesn't, pays it."
Often attributed to Albert Einstein

Assumption: contributions are added at the start of each month, then compounded at a fixed annual return.

1) Base Lump-Sum Formula

A = P(1 + r/n)nt

Used for a single starting principal without recurring contributions.

2) DCA Extension Used by This Calculator

A = P(1 + r/n)nt + C * [((1 + r/n)nt - 1) / (r/n)] * (1 + r/n)
Lump-sum term: P(1 + r/n)^ntContribution term: C * [((1 + r/n)^nt - 1) / (r/n)] * (1 + r/n)

We use this extension because the base lump-sum formula models a one-time principal only, while this calculator also compounds recurring monthly contributions.

3) Nomenclature

A = final amount after all contributions

P = initial principal (lump sum)

C = monthly contribution

r = annual return rate (decimal)

n = compounding frequency per year

t = time in years

nt = total compounding periods

4) Worked Example (Using Current Inputs)

P = 1,000 | C = 500 | r = 0.0800 | n = 12 | t = 10
Lump-sum term = P(1 + r/12)^(12t) = $1,000 x (1 + 0.0066667)^120 = $2,220
Contribution term = C x [((1 + r/12)^(12t) - 1) / (r/12)] x (1 + r/12)
= $500 x [((1 + 0.0066667)^120 - 1) / 0.0066667] x (1 + 0.0066667) = $92,083
A = lump-sum term + contribution term = $2,220 + $92,083 = $94,302
Total invested = P + C x 12t = $1,000 + ($500 x 120) = $61,000
Total growth = A - invested = $94,302 - $61,000 = $33,302

Benefits of DCA

  • Reduces emotional pressure to time market tops and bottoms.
  • Builds consistency and habit through recurring contributions.
  • Lets compounding work over long horizons.

Example Scenarios

Projection only. Real returns vary. This calculator is educational and not financial advice.

Why this DCA calculator gives real value

Most calculators show a number. This one shows the logic: formula, assumptions, and a worked example using your own inputs so you can trust the projection.

What assumptions are used?

  • Fixed annual return converted to a monthly rate.
  • Contributions added monthly and compounded each month.
  • No fees, taxes, inflation, or dividend timing assumptions in this simple mode.

Monthly Contribution Calculator

This tool works as a monthly contribution calculator by modeling recurring deposits with compound growth. If you invest the same amount each month, you can estimate how consistency and time may affect your final portfolio value.

Monthly Investment Growth Calculator

Use this monthly investment growth calculator to compare scenarios with different starting amounts, monthly contributions, and return assumptions. It helps you visualize the difference between principal invested and projected growth.

How to Calculate Monthly Compound Growth

Convert annual return to a monthly rate, apply it over total months, then include recurring contributions. The formula section on this page shows both the base lump-sum equation and the DCA extension used for monthly contributions.

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Frequently Asked Questions

Key DCA calculator questions about formulas, assumptions, and interpreting your projection.

Dollar-cost averaging is an investing strategy where you invest the same amount at regular intervals, such as monthly. It reduces market-timing pressure and helps you build a consistent long-term investing habit.

This calculator uses compound growth with recurring monthly contributions. It combines a base lump-sum growth term with a contribution-growth term, then outputs projected final amount, total invested, and total growth.

It depends on behavior and risk tolerance. Lump-sum investing can outperform when markets rise early, while DCA can lower timing regret and make investing easier to sustain during volatile periods.

Use a conservative, realistic assumption based on your portfolio mix and risk profile. Many investors compare multiple scenarios, such as 6%, 8%, and 10%, instead of relying on one single forecast.

No. This version is a clean projection model and does not include management fees, trading costs, taxes, or inflation adjustments. Real-world net returns are usually lower than raw projected returns.

This calculator assumes contributions are added at the start of each month and then compounded. That assumption slightly increases projected results compared with end-of-month contribution timing.

Yes. The math works for any recurring-investment asset, including ETFs and index funds. The quality of your projection depends on using a return assumption that matches your chosen asset mix.

No. This is an educational projection tool, not financial advice or a performance guarantee. Markets are uncertain, and actual outcomes can differ materially from modeled results.

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