What Is Dollar-Cost Averaging? A Numbers-First Guide

Dollar-cost averaging means investing a fixed amount of money at regular intervals — say $100 every Monday — regardless of the price. When prices fall your fixed amount buys more units; when prices rise it buys fewer. Over time this produces an average cost that sits below the average price of the period.

A concrete example

Suppose you invest $100 per month for four months at prices of $50,000, $40,000, $30,000 and $60,000 per BTC. You accumulate 0.002 + 0.0025 + 0.00333 + 0.00167 ≈ 0.0095 BTC for $400. Your average cost is ~$42,100, while the simple average price was $45,000. That gap is the DCA effect.

DCA vs lump-sum: what the data says

In markets that trend upward, lump-sum investing wins most of the time — roughly two-thirds of historical windows in broad equity studies — because your money spends more time invested. DCA is not a return-maximizing strategy; it is a regret-minimizing one. It protects you from the worst case: investing everything the day before a 50% drawdown.

• Choose lump-sum when you have a large amount and a long horizon, and can stomach drawdowns.
• Choose DCA when the sum would keep you up at night, or when valuations feel stretched.
• Either way, the biggest risk is stopping. A DCA plan abandoned in a bear market locks in the bad average.

Run your own numbers

Our DCA calculator backtests weekly or monthly buys against real historical prices and shows DCA and lump-sum side by side. Try the same amount across 1-year, 3-year and 5-year windows — the answer changes more than you would expect.