DCA Calculator

Dollar-cost averaging (DCA) is the strategy of investing a fixed amount at regular intervals -- weekly, monthly, or even daily -- regardless of the asset price. Instead of trying to time the market with a single large purchase, DCA spreads your investment over time, reducing the impact of volatility on your average entry price. This calculator simulates DCA with your chosen parameters and compares it against a lump-sum strategy.

The concept behind DCA is straightforward: when prices are high, your fixed dollar amount buys fewer units; when prices are low, it buys more. Over time, this tends to result in a lower average cost per unit than making a single purchase at a random point. While DCA does not guarantee profits, it removes the emotional and analytical burden of trying to pick the perfect entry point.

This calculator takes five inputs: your regular investment amount in dollars, the investment frequency (daily, weekly, or monthly), the total investment period in months, an expected annual return percentage, and an optional starting balance. The expected return is applied uniformly to simulate a market with consistent annual growth -- a simplification that works well for long-term projections even though actual returns are volatile in practice.

The results show your total amount invested, the projected portfolio value, the profit or loss, and the average cost per unit assuming a fixed growth rate. More importantly, the comparison chart renders two lines: one for DCA and one for lump sum (investing the total amount up front). This visual comparison shows how the two strategies diverge over time.

In a consistently rising market, lump sum typically outperforms DCA because the money is exposed to gains for a longer period. In volatile or declining markets, DCA often comes out ahead because it captures lower prices during dips. The chart helps you understand this dynamic with your specific numbers.

All calculations are performed entirely in your browser. No investment amounts, return assumptions, or projections are transmitted to any server or stored anywhere. Your financial modeling remains completely private.

The DCA simulation computes the future value of each individual contribution. Each contribution of amount C at time k (measured in years from the end of the period) grows to C * (1 + r)^k, where r is the annual return. The total DCA value is the sum of all such future values plus the starting balance compounded over the full period. For the lump sum comparison, the total invested amount (starting balance + all contributions) is assumed invested at the beginning and compounded as: FV = total * (1 + r)^t, where t is the total period in years. The expected annual return is applied as a smooth continuous growth rate for projection purposes. All math runs in client-side JavaScript with no external dependencies or server calls.