What is beta in stocks?
In one line: Beta measures how much a stock has tended to move compared with the whole market, usually the S&P 500. A beta of 1 moves about the same.
A simple example
The market is the baseline. It has a beta of 1.
A stock with a beta of 1.5 has tended to move about 1.5 times as much as the market. If the S&P 500 rises 2% in a day, this stock has often risen around 3%. If the market falls 2%, it has often fallen around 3%.
A stock with a beta of 0.5 has tended to move half as much. A 2% market drop might mean about 1% for it.
What the numbers mean
- Above 1: swings bigger than the market. Many fast-growing tech stocks sit here.
- About 1: moves roughly with the market.
- Below 1: calmer than the market. Many utilities and big food companies sit here.
- Below 0: tends to move the opposite way. Rare for stocks.
Why it matters
Beta helps you size trades fairly. Two stocks can cost the same, but a high-beta one may swing twice as far. That needs a wider stop and a smaller position for the same risk.
The position size calculator turns your stop into a size. Our guide on what moves stock prices covers the bigger picture.
A common mistake
Treating beta as a fixed fact. It's built from past prices, often over 1 to 5 years. A company can change. So can its beta.
Beta also only tracks moves with the market. A stock can have a low beta and still jump 20% on its own news, like an Earnings report.
Use beta as a hint about how jumpy a stock is. Then check the chart's real swings, for example with ATR.
Questions
Is a high beta good or bad?
Neither. It means bigger swings both ways. That brings bigger possible gains and bigger possible losses.
Where can I find a stock's beta?
Most stock sites and broker apps list it on the stock's summary page. Different sites use different time spans, so numbers can differ.
What is the beta of the S&P 500?
It's 1 by definition, when the S&P 500 is the benchmark.
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