---
title: Dollar-cost averaging — what it means and why it matters | Allocate AI
description: Investing a fixed amount on a regular schedule regardless of price, which spreads out timing risk and removes the need to guess when to buy.
canonical: https://allocateai.io/glossary/dollar-cost-averaging
site: Allocate AI — https://allocateai.io
---

# Dollar-cost averaging

Investing a fixed amount on a regular schedule regardless of price, which spreads out timing risk and removes the need to guess when to buy.

Dollar-cost averaging means investing the same amount at regular intervals, such as $500 on the first of every month, without regard to whether the market is up or down. When prices are high, the $500 buys fewer shares; when prices are low, it buys more. Over time your average cost per share settles somewhere below the average price, and you never have to decide whether today is a good day to invest.

Most people already do it without the name. A 401(k) contribution from every paycheck is dollar-cost averaging. So is an automatic monthly transfer to a brokerage account.

A simple example over four months: $500 buys 10 shares at $50, 12.5 at $40, 8.33 at $60, and 10 at $50. You spent $2,000 for 40.83 shares, an average cost of $48.98, even though the average price was $50.

The strategy has a known trade-off. Because markets rise more often than they fall, investing a lump sum all at once has historically beaten spreading it out about two-thirds of the time. Dollar-cost averaging gives up a little expected return for a smoother ride and protection against buying everything at a peak.

For people who receive stock vests or bonuses, the practical question is what to do with a lump. A reasonable middle path is to invest it over three to six months on a fixed schedule. The common mistake is holding cash while waiting for a better price, which is the guessing that averaging was meant to avoid.

## Related terms

- [Index fund](https://allocateai.io/glossary/index-fund) — A mutual fund or ETF that holds every stock in a market index like the S&P 500, so you own a slice of the whole market at very low cost.
- [Compound interest](https://allocateai.io/glossary/compound-interest) — Growth on top of growth: earnings are added to the balance, and then those earnings earn too, so money grows faster the longer it is left alone.
- [Lump sum matched to a goal](https://allocateai.io/glossary/lump-sum-matched-to-goal) — In Allocate, an expected one-off payment, like a bonus or vest, assigned to fund a specific goal, so the goal counts it and stops warning.
- [Asset allocation](https://allocateai.io/glossary/asset-allocation) — How your investments are split between stocks, bonds, and cash; the mix drives most of your long-term return and how bumpy the ride is.

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Allocate AI is a budgeting and financial-planning app: link your accounts, say what you want in plain words, and it writes the plan and stages every change for your approval. Read more at https://allocateai.io or see all pages in https://allocateai.io/llms.txt.