See your DCA portfolio grow — monthly contributions, annual step-ups, and a head-to-head vs lump-sum.
DCA is investing on a fixed schedule regardless of price. This calculator projects your portfolio with optional annual step-ups and compares the outcome to a lump-sum investment of the same total dollars.
Direct answers to the most common questions, in plain language. Skim if you're in a hurry; dig deeper below.
Investing the same amount on a schedule, regardless of price.
DCA is investing a fixed amount at regular intervals (weekly, monthly) regardless of market price. You buy more shares when prices are low, fewer when prices are high — averaging your cost basis.
Lump-sum historically wins on returns; DCA wins on emotion.
Vanguard's landmark study showed lump-sum investing beats DCA about 2/3 of the time, by an average of ~2%. But DCA reduces regret risk if markets crash right after investing — which is why most people prefer it psychologically.
Monthly is fine; bi-weekly slightly better; weekly negligibly better.
The benefit of more frequent intervals diminishes quickly. Monthly DCA captures 95%+ of the smoothing effect of weekly. Match your contribution frequency to your paycheck for simplicity.
Yes — automated 401(k) contributions ARE DCA.
Every payroll-deducted 401(k) or IRA contribution is dollar cost averaging by definition. Most retirement investors are already DCAing without thinking of it that way.
The mechanics in short answers — no jargon, no upsell.
Fixed dollar amount each period. When prices are low, that buys more shares; when high, fewer. Over time, your average cost is lower than a simple "average price" would suggest.
You're mathematically guaranteed to never buy 100% at the top. The downside: you also can't buy 100% at the bottom. DCA eliminates timing risk at the cost of expected return.
Year 1 contributions matter most because they have the longest to compound. The "DCA snowball" rolls because early dollars grow at the full return rate for decades.
Increasing your contribution amount 3–5% annually (matching income growth) significantly outperforms a flat contribution — without ever feeling like a sacrifice.
Designed so anyone can model their situation in under a minute, with or without a finance background.
Year-by-year balance, contributions, and gains.
See both side by side — same total dollars, different outcomes.
Weekly, bi-weekly, monthly, quarterly — see the small differences.
Model raising your contributions yearly to match income growth.
Toggle between historical equity returns (10%), conservative (6%), and high (12%).
Set a target number — see how many months until your DCA gets there.
Everything you might ask before, during, or after using this tool.
In strongly trending markets (the majority of years). Vanguard found lump-sum beats DCA about 68% of the time over 12-month windows. The math: markets are up most of the time, so spreading out purchases means missing some of that upward drift.
When markets drop significantly during the DCA period. If you DCA into the 2008 or 2020 crashes, your average buying price ends up below where lump-sum would have entered. Hindsight is required to know which years those will be.
Yes. DCA is investing on a fixed schedule regardless of price — pre-committed and disciplined. "Averaging down" is buying more of an asset that just dropped, often emotionally — sometimes wise (broad index), sometimes destructive (chasing a falling individual stock).
Mathematically, lump-sum wins in expectation. Psychologically, many investors regret lump-sum if markets drop right after. A common compromise: DCA over 3–6 months. Avoid stretching beyond 12 months — that's leaving too much in cash too long.
It mechanically can, but the risk profile is different. DCA into broad index funds spreads timing risk across the whole market. DCA into a single stock is still entirely exposed to that company's fundamentals.
DCA into volatile assets like crypto has the strongest smoothing benefit (volatility is higher → averaging effect is bigger). Many crypto-curious investors use DCA specifically to mitigate the timing nightmare of buying volatile assets.
Fixed-dollar DCA loses purchasing power to inflation over time — $500/month in 2026 is less powerful than $500/month in 2036. That's why annual step-ups (3–5%/year) are nearly essential for serious long-term DCA plans.
Yes, in a few scenarios: (1) the investment goes to zero (avoid by using diversified funds), (2) you stop during a downturn (defeats the purpose), or (3) you DCA into something you should have lump-sumed and miss meaningful returns. The discipline matters more than the math.
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Dollar cost averaging = fixed dollar amount, fixed schedule, fixed asset (or set of assets). The discipline is in the schedule, not the amount.
It's NOT timing the market, NOT averaging down on a bad pick, NOT a strategy for picking winners. It's a risk-management tool that trades expected return for emotional safety.
Most 401(k) contributors are doing DCA without realizing it — their bi-weekly payroll deduction goes into the market on a fixed schedule.
Vanguard's research (2012, updated multiple times): lump-sum beats DCA about 2/3 of the time across US, UK, AU equity markets, by an average of ~2% over 12 months.
Why: markets trend up more often than down. Holding cash to DCA = missing some of that uptrend.
But the 1/3 of the time DCA wins matters: it wins by avoiding the worst single-day entries. Investors with low risk tolerance often prefer the worse expected return for the smaller worst-case.
The honest answer: if you have a lump sum, lump-sum it. If you have income, DCA it. They're not competing strategies — they're for different situations.
Inflation runs ~3%/year. Without step-ups, your DCA loses 26% of its real value over 10 years.
A 3% annual step-up keeps your DCA constant in real dollars. A 5% step-up grows it.
Tie step-ups to your raise — if you got a 4% raise, increase your DCA by 4%. You'll never miss the money because you never had it.
Weekly DCA: smoothest, requires most discipline, captures highest-frequency price variation.
Bi-weekly: matches most paychecks; ~95% of the smoothing benefit of weekly.
Monthly: simplest; ~85% of the smoothing benefit of weekly. The pragmatic choice for most people.
Quarterly: too infrequent; you're essentially making four lump-sum bets per year. Avoid.
Two short notes worth reading before you trust any number on this page.
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