Dollar Cost Averaging Calculator
Model the long-term growth of regular DCA investments — weekly, monthly, or quarterly — with real asset presets and lump sum comparison.
Dollar cost averaging (DCA) means investing a fixed amount at regular intervals regardless of market price. Investing $500/month into an S&P 500 index fund at the historical 7% average annual return grows to $567,000 in 30 years — on just $180,000 invested. DCA reduces timing risk, builds the habit of consistent investing, and is the core strategy behind 401(k) auto-contributions. This calculator shows your exact projected portfolio value, total invested vs. gains, and compares DCA against a lump-sum investment.
How DCA Returns Are Calculated
DCA returns are calculated using the future value of an annuity formula — the same math behind mortgage payments, but in reverse. Each periodic contribution grows at the expected rate of return for the remaining investment period. Earlier contributions compound longer and contribute more to the final value.
| Variable | Definition |
|---|---|
| FV | Future value — your portfolio balance at end of investment period |
| PMT | Periodic payment (e.g., $500/month) |
| r | Rate per period (annual return ÷ periods per year) |
| n | Total number of contributions (years × periods per year) |
Example: $500/month for 30 years at 7% annual return = $500 × [((1.00583)^360 − 1) / 0.00583] = $566,765 on $180,000 invested. The S&P 500 has historically returned 10.5% nominal (7% inflation-adjusted) since 1926 — making consistent DCA the single most reliable wealth-building strategy for individual investors.
💡 Expert Pro-Tip
Automate DCA and Never Look at the Account During a Crash: The #1 mistake retail investors make is stopping DCA during market downturns — exactly when they should continue (or increase) contributions. In March 2020, the S&P 500 dropped 34% in 33 days. Investors who paused DCA locked in losses. Investors who kept investing monthly through the crash recovered and profited within 5 months. Set up automatic monthly transfers to your brokerage or 401(k). Then, in your phone, remove the app or hide it in a folder. The investors who ignore their portfolios during crashes consistently outperform those who actively manage them. Boring is profitable.
Dollar Cost Averaging FAQ
What is dollar cost averaging (DCA)?
Dollar cost averaging is investing a fixed dollar amount at regular intervals regardless of market price. If you invest $500/month and the share price is $100, you get 5 shares. If it drops to $50 next month, you get 10 shares. Your average cost per share falls below the average price — a mathematical advantage called "volatility harvesting."
What S&P 500 return should I use for DCA projections?
The S&P 500 has averaged 10.5% nominal annual returns since 1926. Adjusted for inflation (currently ~3%), the real return is approximately 7–7.5%. For conservative planning, use 6–7%. For nominal (non-inflation-adjusted) projections, use 9–10%. Most financial planners use 7% real return as the standard benchmark for long-term equity projections.
Is more frequent DCA (weekly vs. monthly) better?
Mathematically, more frequent contributions compound marginally faster — weekly DCA beats monthly DCA by approximately 0.1–0.3% annually on identical contribution amounts. However, the difference is small enough that monthly DCA aligned with your paycheck is optimal for most people. The most important factor is consistency, not frequency.
Can I use DCA for crypto or individual stocks?
Yes, the DCA formula works for any asset. However, the expected return assumption is critical — individual stocks can go to zero, and crypto has had 80%+ drawdowns. The calculator uses your inputted annual return assumption. For volatile assets, DCA's risk-reduction effect is more pronounced, but it doesn't protect against permanent losses if the asset fails.
Dollar Cost Averaging Calculator
Investment Details
Used to calculate shares accumulated and avg cost basis
12 contributions/year × 20 years = 240 total investments
DCA Projection
DCA vs. Lump Sum
Portfolio Growth
Based on your results — what to do next:
See the math behind your gains
Your DCA generates $143,502 in gains over 20 years. Visualize how that compound curve accelerates in the final years.
Is this DCA plan enough for retirement?
$6,000/year growing to $264,502 — check if that projects to the retirement income you need.
DCA inside a tax-advantaged account
If this $121,000 is in a 401(k) or IRA, you avoid taxes on the $143,502 in gains. See the tax-deferred multiplier.