The Fear and Greed Index — What It Measures and How to Read It

You open the news and the headlines are screaming blood: markets are crashing, commentators are reeling off recessions, and the social-media groups are full of red charts. Or the opposite — everything is rising, every acquaintance suddenly "gets" stocks, and a quiet thought whispers that you are late to the party. In both cases you ask yourself the same thing: how scary is it really out there?

That is exactly the question the Fear and Greed Index tries to answer — a single number that gathers the market's mood into a simple scale. It is not a crystal ball and not a sign of when to buy or sell. It is more like a thermometer: it shows you what the emotional "temperature" is right now, so that you do not confuse it with your own sober judgment. In this article you will see what exactly the index measures, how CNN and alternative.me compute it, why Selurio shows two such gauges on its home page — and how to read it without letting it become just another trap.

What the index is: a single number from 0 to 100

At its core the index is a scale from 0 to 100. Low values mean fear — investors are cautious, they sell, and they hide in safe assets. High values mean greed — optimism, appetite for risk, and confidence that up is the only direction prevail. The middle, around 50, is a neutral zone in which neither emotion dominates.

To make it more readable, the range is divided into five zones. These are exactly the boundaries the Selurio gauge uses:

The numbers in the examples below — 72, 18 and the like — are illustrations, not current values. The idea is not to memorize a specific number, but to understand what it means when you see it.

The idea behind it: sentiment in reverse

Why should the mood interest us at all, rather than just prices? Because the emotions of the crowd swing to extremes — and it is precisely at those extremes that people most often go wrong. When everything is falling, fear screams "save yourself" and many investors sell at the bottom. When everything is rising, FOMO — the fear of missing out — pushes those same people to buy at the top. The result is the classic mistake: you buy high and sell low.

This is where the idea of contrarian sentiment comes from: historically the crowd is most frightened near the bottoms and most euphoric near the tops. The old stock-market wisdom puts it this way — be cautious when others are greedy, and calm when others are fearful. That is why extreme fear on the index often coincides with moments when panic is overdone, and extreme greed with moments of excessive self-confidence.

How we frame this matters. The index does not tell you "buy now" or "sell now." It is more of a mirror of your own emotions: when everyone around you is in a panic and you feel the urge to sell everything, a number in the extreme-fear zone is a reminder that you are probably not the only one who feels that way — and that loss aversion is working hardest against you right now. Conversely, in the extreme-greed zone the index is a reason to ask yourself whether you are giving in to the euphoria of the crowd. Why emotions are so expensive and how to take them out of your decisions we cover in detail in the psychology of investing.

How CNN computes its index: the seven indicators

The most recognizable version is the CNN Fear & Greed Index for US stocks. It does not guess the mood "by eye"; it assembles it from seven measurable market indicators. Each is normalized on a 0–100 scale and averaged with equal weights to produce a single overall number:

The logic behind each is simple once you look at it. When prices are high above their average levels and new highs line up one after another, the market is self-assured — that is, greedy. When volatility spikes (the VIX, the "fear index," rises) and investors crowd into bonds and insurance against a decline via put options — fear dominates. No single indicator is enough; the strength is in the combination, which smooths out the noise of each one on its own.

It is worth noting that CNN does not publish an official, documented API for this number. That is exactly why Selurio does not rely on its gauge directly, but builds its own transparent version — more on that shortly.

The crypto version: alternative.me

For the crypto market there is a separate, independent gauge, maintained by alternative.me. It works on the same idea — a number from 0 to 100 and the same five zones — but it looks at factors specific to crypto: volatility, market volume, social-media sentiment, Bitcoin dominance, and internet searches. Because Bitcoin carries the most weight, in practice this index mainly reflects its mood.

Its big advantage is accessibility. Unlike CNN, alternative.me offers a free, open API with no key, which returns the value and its classification (for example value: "72", value_classification: "Greed") together with history going back in time. The index updates once a day, so one value per day is entirely sufficient.

The two gauges in Selurio: "The Market Pulse"

On the Selurio home page the two gauges live together in the "Market Pulse" section — one for crypto and one for US stocks, so you can feel the mood of both worlds at a glance.

The crypto gauge uses exactly the free alternative.me API and shows the current value, the zone, and a mini-history for the last 30 days. The stock gauge is our own transparent composite — instead of copying CNN's "black box," we compute it from three of the seven classic indicators for which reliable data exist: market momentum (S&P 500 vs its 125-day average), volatility (VIX), and safe-haven demand (stocks vs long-term bonds). The overall number is the rounded average of the three sub-scores, and each of them is visible — so you can always check exactly what produces the final result. This is a deliberate choice: we prefer a gauge whose methodology you can trace over one you simply have to take on trust.

Both gauges use the same zones and colors (muted, not casino neon), so you read one scale the same way you read the other.

Why this is NOT a "buy/sell" signal

Here is the most important part, the one that separates the sensible reader from the impulsive one. The index is a thermometer, not a doctor. The thermometer tells you that you have a fever — it does not prescribe a treatment and does not tell you exactly how ill you will be.

A few reasons to treat it this way:

• It measures emotion, not value. The index shows how the market feels, not whether an asset is cheap or expensive. The mood can be in extreme fear while prices are still overvalued, and vice versa.
• Extremes can deepen. "Extreme fear" is not a guaranteed bottom. The market can fall further and stay frightened for weeks on end. Anyone who buys "because the index is low" easily turns out to be early.
• The numbers change every day. Today's 72 could be 55 tomorrow. A single momentary number is no basis for an irreversible decision with real money.
• It is not personal advice. Selurio is an educational platform, not a licensed financial adviser. The index explains market psychology — it does not tell you what to do with your money, your horizon, and your risk.

In other words, the high volatility that lifts the "fear" is a normal part of the market, not an alarm to act on. The difference between volatility and real risk we cover in risk and return.

How to read it sensibly

If it is not a signal, what is it good for? For context and for self-observation. Here is the level-headed way to use it:

• As a mirror of your own emotions. If the index is in extreme fear and you feel the urge to sell everything right now — that is the moment to remember your plan, not to abandon it. The number tells you that your emotion is shared by the crowd, not that it is right.
• As a reminder, not a trigger. Extreme greed is a reason to check whether you are taking on more risk than you planned — not a command to sell.
• Together with real protection. Discipline comes from a system, not from watching the mood: a written plan, regular equal contributions, and broad diversification that makes the declines of one market more bearable. Then a single number on the gauge stops commanding you.
• From time to time, not obsessively. The index updates daily. Looking at it ten times a day only amplifies the anxiety — the exact opposite of its purpose.

Used this way, the gauge becomes a useful corrective to your instincts rather than just another source of noise. See it live in the "Market Pulse" section and make a habit of reading it like a temperature — with curiosity, without panic.

Sources

• CNN Markets — Fear & Greed Index — the original gauge for US stocks and its seven indicators: cnn.com/markets/fear-and-greed (opens in new tab)
• alternative.me — Crypto Fear & Greed Index — the crypto version and its free API: alternative.me/crypto/fear-and-greed-index (opens in new tab) · API documentation (opens in new tab)

The numbers in the article are illustrations of the zones, not current values — the real index changes every day.

Continue reading

• The psychology of investing — the biases the index merely measures, and how to disarm them.
• Risk and return — why volatility frightens but is not the real risk.
• Diversification — the protection that makes the market's mood less frightening.
• Glossary: FOMO — the emotion that the far end of the "greed" scale captures in a single number.

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