What is the RSI?

What the number actually means

A high RSI means recent candles have gained much more than they have lost. A low RSI means the opposite. That is the entire calculation, and it is worth saying plainly because most explanations skip straight to the trading rules.

• Above 70 is conventionally called overbought.
• Below 30 is conventionally called oversold.
• Around 50 means gains and losses have been roughly balanced.

Those words are labels, not instructions. Overbought means price has risen quickly, nothing more.

Why overbought does not mean sell

This is the single most expensive misunderstanding in technical analysis. In a strong trend, the RSI can sit above 70 for weeks while price keeps rising. Selling because the RSI reached 70 means selling into strength, repeatedly, and being wrong for as long as the trend lasts.

The reverse is just as true. An RSI below 30 in a downtrend is not a bargain, it is a description of how hard the market is falling.

The useful reading is the opposite of the popular one: an RSI that stays above 70 is evidence of a strong trend, not of an imminent reversal.

Divergence, and what it is worth

Divergence is when price and the RSI disagree. Price makes a higher high, the RSI makes a lower high. It says the second push had less force behind it than the first.

Two things are worth keeping straight:

• Divergence is a warning about momentum, not a signal to reverse. Momentum fades before price turns, and it also fades in the middle of trends that continue.
• Divergence on a low timeframe appears constantly and means almost nothing. On a daily or weekly chart it is worth a look.

What holds up, and what does not

What holds up: the RSI is an honest summary of recent momentum, and it is calculated the same way for everyone. Comparing the current reading to where it has been on the same chart tells you whether this move is unusually strong for this market. That comparison is genuinely useful.

What does not hold up: the 70 and 30 lines as buy and sell triggers. They are defaults chosen decades ago, not thresholds discovered in the data, and trading them mechanically in a trending market is close to the worst thing you can do with the indicator.

The other limit is that the RSI is derived from price. It contains no information price does not already contain. It compresses that information into one number, which is useful for comparison and useless as a source of truth.

The mistakes that cost the most

• Selling at 70 and buying at 30 with no reference to the trend.
• Reading divergence on a one-minute chart and treating it as a reversal.
• Changing the period from 14 until the indicator agrees with the trade you wanted.
• Stacking three momentum indicators that all measure the same thing and calling it confluence.
• Forgetting that a fresh RSI reading on a new instrument has no history to be compared to.

Questions people ask

What is a good RSI setting?

Fourteen, and there is a reason to keep it. The value matters far less than the fact that everyone uses the same one, which is what makes the readings comparable between traders. A shorter period reacts faster and gives more false readings, a longer one lags.

Does the RSI work on crypto and forex?

It is calculated identically on any market with a price series, so yes. What changes is the character of the market: thinner, faster markets reach extremes more often, so the same reading means less than it would on an index.

Is RSI divergence reliable?

It is a real observation and a poor trigger. Divergence appears before many reversals and also before many continuations, so on its own it does not tell you which one you are looking at. It is worth more when it lines up with a level or a structural break.

Should I use the RSI or the MACD?

They measure related things in different ways, and using both does not double your information. If you want one momentum reading, pick one and learn how it behaves on the markets you actually trade.

Reading momentum without adding indicators

Trading AI reads a photo or a screenshot of any chart and returns the RSI reading when it is visible in the image, alongside the market structure, the key levels, the order blocks, the fair value gaps, the liquidity pools and a trade plan. What is not in the frame does not exist for the model, so an indicator panel that is not on screen cannot be read.

A momentum reading only means something inside a trend, and the trend is defined by structure: What is market structure?

An extreme reading at an obvious level is a very different situation from one in open space: What are support and resistance?

The candles the RSI is calculated from are the place to start: How to read a candlestick chart.

This page is educational. It is not financial advice, and nothing here is a recommendation to buy or sell anything.