Portfolio Sweepwatch & learn · not investment advice

Dollar-cost averaging, in plain English

The definition, as the app uses it

Buying a fixed amount on a schedule instead of all at once, so you don't have to time the market. A common beginner approach.

The mechanics are simple: the same amount, on the same schedule — say, every payday or the first of the month — whatever the price happens to be that day. Because the amount is fixed, it automatically buys more shares when the price is low and fewer when the price is high. No forecast is involved, and no day has to be picked as "the right day."

What it changes is mostly the decision load. Investing a lump sum all at once asks one big timing question; spreading the same total across a schedule replaces it with a habit. The trade-off is equally plain: money waiting for its scheduled day is money not yet invested, and in a market that rises steadily, earlier would have been better. It is a way of removing timing from the job — not a guarantee about outcomes, which no approach offers.

Worked example — illustrative figures only, not a real asset

An example $50 goes in on the first of each month for six months: $300 total. At example prices of $25, $20, $25, $40, $50, and $40, those six purchases bring in 2, 2.5, 2, 1.25, 1, and 1.25 shares — 10 shares in all, at an average cost of $30 a share, without a single timing decision along the way.

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Last reviewed: November 8, 2026

Portfolio Sweep never gives buy or sell calls. It describes what prices are doing — trend, momentum, how it compares to the market — so you can learn and decide for yourself. You don't trade inside Portfolio Sweep. This page is education, not investment advice.