RSI Explained Simply: How to Read It and When It Misleads You
The 30 and 70 levels, divergence, and why an RSI reading alone isn't a reason to tap Up or Down.
7 min readAuthor: Soslan KasaevЭта статья на русском
The Relative Strength Index (RSI) tells you how strongly and how quickly price has been moving up or down over the last few candles. It's plotted on a scale from 0 to 100. The higher the line, the more aggressive the buying has been; the lower it is, the more aggressive the selling. That's really all it measures.
So why do so many beginners lose trades "following RSI"? Because they read it as a forecast. It isn't one. Let's walk through how to read RSI on a real chart, where it helps, and where it quietly misleads you.
What RSI actually measures
RSI was introduced by J. Welles Wilder in the late 1970s. It compares the average size of up-moves with the average size of down-moves over a chosen period. The default is 14 candles, so on a 1-minute chart RSI looks back 14 minutes; on a 5-minute chart, about 70 minutes.
You don't need the formula. You need the logic:
mostly large green candles recently → RSI climbs;
mostly large red candles → RSI falls;
choppy, sideways price → RSI hovers around 50.
In other words, RSI is a summary of what has already happened. Keep that in mind and half of the common mistakes disappear.
Overbought and oversold: the 30 and 70 levels
Most platforms draw two dotted lines on the RSI panel.
Above 70 — overbought. Price has been pushed up hard for a while.
Below 30 — oversold. Price has been pushed down hard for a while.
Between 30 and 70 — neutral. Nothing unusual.
The tempting rule is "above 70, go Down; below 30, go Up." That rule is responsible for a lot of lost stakes.
Overbought is not a reversal
"Overbought" describes strength, not exhaustion. In a strong rally RSI can stay above 70 for dozens of candles. Every time you bet against it just because the line is high, you're fighting a move that's still going.
A more useful clue is the exit from the zone: RSI was above 70 and then drops back below it. That suggests buyers are losing steam. Still, it's a clue, not a decision.
The quiet middle: level 50
People tend to ignore the midline. When RSI holds above 50, buyers are generally in control. Below 50, sellers are. It's a simple way to gauge overall mood without guessing at turning points.
RSI divergence
Divergence is when price and RSI disagree.
Bearish divergence: price prints a higher high, but RSI prints a lower high. The rally continues, but with less force behind it.
Bullish divergence: price prints a lower low, but RSI prints a higher low. The decline continues, but it's weakening.
How to spot it:
Find the last two clear highs (or lows) on the price chart.
Check what RSI was doing at those same moments.
If they point in opposite directions, you have divergence.
Wait for price itself to confirm — for example, a candle closing firmly the other way.
Divergence can last a long time. Strong trends often show two or three divergences in a row while price keeps going. Treat it as a reason to pay attention, not a reason to trade.
What it looks like on a screenshot
Picture a 5-minute EUR/USD screenshot from your broker's app:
the last half hour is mostly green candles, and price just made a new high;
RSI below the chart was around 78 and has now slipped to 68;
the previous price high was lower, yet RSI reached 82 there.
What you can read from this:
RSI has left overbought territory — buying pressure is fading;
there's bearish divergence — the new high came with less momentum;
but the latest candle is still green and there's no clear reversal yet.
The honest read here is "signs of a weakening rally, no confirmation." For a short-expiry trade, that usually means stay out and watch a couple more candles. It's not an exciting answer. But a skipped trade costs you nothing.
On the chart | What it means | What to do |
|---|---|---|
RSI above 70 and rising | strong rally in progress | don't fight it |
RSI drops back below 70 | rally losing steam | wait for price confirmation |
RSI drifting around 50 | no clear direction | often better to skip |
RSI climbs back above 30 | selloff losing steam | wait for price confirmation |
price and RSI disagree | move is weakening | check candles and levels |
Which RSI settings to use
Period 14 works for most situations. You'll also see advice to use 7 or even 5 on fast charts.
Short period (5–9): RSI reaches 30/70 more often — more hints, more false ones too.
Long period (21+): smoother line, fewer and later hints.
There's no setting that works every time. Pick one — 14 is fine — and learn how it behaves on your asset and timeframe. Constantly tweaking settings to fit each chart is a reliable way to fool yourself.
RSI on 1-minute and 5-minute charts
On very short charts RSI is jumpy. On a 1-minute chart it can swing from 30 to 70 and back in a handful of candles. Each touch looks meaningful, but most of it is noise.
A few habits that help:
check a higher timeframe first. If the 5-minute chart is trending up, "oversold" on the 1-minute is more likely a pullback than a reversal;
notice how RSI has behaved over the last hour. If it keeps turning at 65 instead of 70, that's the practical level for this asset right now;
avoid the first minutes after major news — RSI is describing chaos, not strength.
The shorter the expiry, the more randomness in the outcome. That's the honest reality of short trades.
Combining RSI with other tools
On its own, RSI is a weak helper. It becomes more useful when other evidence lines up:
Trend. If price is above a rising moving average, an RSI bounce from 30 makes more sense than a drop from 70. See our guide to moving averages.
Candles. A reversal candle such as a pin bar near 30 or 70 adds weight. Here are candlestick patterns worth knowing.
MACD. When RSI and MACD both show fading momentum, the picture is more consistent. More in our MACD guide.
Levels. Oversold right at a level price has bounced from before is more interesting than oversold in the middle of nowhere.
When the tools disagree — RSI screams overbought while the trend is clearly up — that's information too. Usually it means there's no confident answer right now.
Common RSI mistakes
Trading against the trend because of 70 or 30. The most expensive habit. Strong moves keep RSI pinned for a long time.
Using RSI alone. It repeats what the candles already show; it adds no knowledge about the future.
Re-tuning the settings for every chart. You can make any indicator "prove" anything.
Treating divergence as a reversal. It's a warning. The reversal still has to happen.
Trading through news. Price can blow through every level; RSI can't help you there.
Never skipping. When the picture is unclear, the careful choice is not to enter. That's a decision, not a weakness.
Quick recap
RSI measures the strength of past movement, not future direction.
Above 70 and below 30 mark strong moves, not certain turning points.
Leaving a zone tells you more than being in it.
Divergence is a warning that needs confirmation.
RSI works best alongside trend, candles and levels.
When the evidence conflicts, sometimes the best trade is no trade.
A second pair of eyes
Learning to read RSI yourself is worth it. But in the moment, with candles moving and an expiry timer ticking, it's easy to see what you want to see. Upload a screenshot and TrendX will show you what's on the chart: what RSI is saying, whether it conflicts with other clues, and whether entering makes sense at all. The answer can be Up, Down or Stay out — always with the reasoning.
Important. Binary options trading is high risk and you can lose your entire stake. This article is for educational purposes only and is not investment advice. No indicator, RSI included, knows where price will go.