A fear and greed index is a composite gauge that condenses several measures of market behavior into a single score, usually from 0 (extreme fear) to 100 (extreme greed). It describes how investors are behaving now, not what the market will do next.
How it works
Each input captures one aspect of risk appetite. The best-known version, published by CNN Business, combines seven indicators. Most indexes of this kind draw on the same building blocks:
- Momentum: the S&P 500 against its 125-day moving average. The further the index trades above the average, the greedier the reading.
- Strength: how many stocks are at or near 52-week highs compared with 52-week lows.
- Breadth: how widely a move is shared, for example the share of stocks above their 50-day average (see market breadth).
- Safe-haven demand: stock returns minus Treasury returns over the last 20 trading days. Bonds outperforming stocks reads as fear.
- Junk-bond demand: the appetite for high-yield credit relative to Treasuries, measured by spreads or relative returns.
- Volatility: the VIX, or realized volatility, against its recent average. Rising volatility reads as fear (see implied volatility).
- Options positioning: the put/call ratio. Heavy put buying reads as fear.
Each input is converted to a common 0–100 scale, typically by ranking today's reading against its own history (a percentile), and the index is the average of those scores. Because every input is measured against its own past, a score of 80 means the readings are high relative to the last year, not high in any absolute sense.
How to read it
Most readers treat the index as contrarian context. At extreme greed, positioning tends to be stretched and much good news is already in prices, so new entries carry a weaker risk/reward and chasing strength becomes costly. At extreme fear, selling may be close to exhaustion, but in a bear market fear can stay extreme for weeks while prices keep falling.
Two habits make the reading more useful. First, look at which components drive it: fear that comes only from a volatility spike is different from fear that shows up in every input at once. Second, read it alongside the long-term trend. An index of 20 with the S&P 500 above its 200-day average describes a pullback in an uptrend; the same 20 below the 200-day average describes a market already in a downtrend.
Worked example (illustrative numbers)
Suppose six inputs score as follows on two dates three weeks apart, during which the S&P 500 falls about 6%:
| Input | Before | After |
|---|---|---|
| Momentum | 80 | 35 |
| Strength | 70 | 40 |
| Breadth | 65 | 35 |
| Safe-haven demand | 75 | 25 |
| Junk-bond demand | 60 | 45 |
| Volatility | 70 | 20 |
| Index (average) | 70 | 33 |
The first reading (420 ÷ 6 = 70) sits in the greed zone of a typical scale; the second (200 ÷ 6 ≈ 33) sits in fear. The shift happened because prices fell: the index confirmed the move rather than anticipating it. What it adds is the observation that volatility and safe-haven demand deteriorated most, while junk-bond demand held up, suggesting credit markets were calmer than equities.
Limitations and common mistakes
- Using it as a timing signal. Extremes can persist, and a reading of 10 can become 5 before prices stabilize.
- Comparing different providers. Inputs, lookback windows and zone cut-offs differ, so 30 on one index is not 30 on another.
- Forgetting the lookback. After a long calm stretch, a modest rise in volatility can score as fear, because it is ranked against an unusually quiet year.
- Assuming it covers the whole market. Most inputs come from large caps and the S&P 500; small caps can tell a different story.
- Ignoring position risk. A favorable reading does not change the loss on a trade if its stop is hit; see stop-loss and position sizing.
In Clear Tape
Clear Tape calculates its own Fear & Greed index from daily closing prices; it is not CNN's index. It uses six indicators: momentum (SPY's close ÷ its 125-day average), strength (the share of the screener's stocks closing within 2% of a 52-week high), breadth (the share closing above their 50-day average), safe-haven demand (SPY's 20-day return minus TLT's), junk-bond demand (HYG's 20-day return minus IEF's), and volatility (SPY's 20-day realized volatility ÷ its 50-day average, inverted). The VIX is not used because it is not covered by Clear Tape's data license.
Each indicator is scored by its percentile among its own last 252 sessions; the index is the average of the available scores and needs at least four of the six. The zones are 0–24 extreme fear, 25–44 fear, 45–55 neutral, 56–75 greed and 76–100 extreme greed. A mechanical market stance sits on top: SPY below its 200-day average is Defensive; otherwise a reading of 76 or higher, or 24 or lower, is Cautious; 56–75 is Constructive; anything else is Neutral.
The score appears on the Today page on the Free plan, next to a link to CNN's index for comparison. The stance and the six component readings are available to Tools and Pro members.
For educational purposes only. Not investment advice.