What this tool does. It pulls the last 120 Binance K lines for the market and interval you pick, calculates RSI(14) using Wilder smoothing, marks the zone the reading sits in, and draws the last 60 readings as a small trend line so you can see the direction rather than one frozen number. It refreshes about once a minute, and you can still paste your own close prices when you want a manual check. The calculation runs in your browser.
Why your RSI and someone else's disagree.
RSI is useful only after the price structure is marked. A hot RSI can stay hot while ETF demand is strong, and a weak RSI can stay weak when liquidity is thin. Before you argue with a chart that shows a different value, it is worth knowing how sensitive this calculation is to things that have nothing to do with the market.
Wilder smoothing is recursive: each period's average gain and loss carry a share of every period before it. There is no clean cut-off after fourteen candles, so the value has a long memory of the series it was seeded with. Feed this calculator the fifteen-close minimum it accepts and you will get a slightly different reading than a platform running the same RSI(14) over two years of history — neither is wrong, they simply started in different places. Add the fact that crypto has no session close, so the daily boundary is a venue convention, and small disagreements between two "correct" RSI readings are normal. Chase them and you are debugging the plumbing, not the market.
The other property to respect is that RSI is bounded. Squeezing an unbounded thing — momentum — into a 0-to-100 range means it compresses at the edges: once a trend is strong enough, further strength barely moves the number, and the indicator quietly stops carrying information exactly when the move is biggest. That is the mechanical reason a reading can sit high through an entire leg, and the reason the distance between readings matters more than any single one.
Open the advanced drawer, paste the fifteen-close minimum, note the result, then paste a much longer series for the same market and interval and compare. The gap between the two is the seeding effect, and it tells you how much precision this reading actually deserves before you treat a level as a line.
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Advanced: override with your own close prices (paste 15 or more numbers)
How to use the reading.
30 and 70 are guide rails, not commands.
Classic RSI teaching treats below 30 as oversold and above 70 as overbought. Crypto trends can stay above 70 for days. In March 2024, BTC 4h RSI spent repeated sessions in the high zone before the move finally tired.
Divergence matters more than the threshold.
When price makes a higher high but RSI fails to confirm, momentum is weakening. When price makes a lower low but RSI makes a higher low, sellers may be losing force. That is the part of RSI worth tracking.
BTC reached about $73,777 on March 14. RSI above 70 appeared before the final high, but the cleaner warning was momentum divergence near the top. A threshold alone was early; structure made the signal usable.
Local market note.
US traders often compare RSI with ETF flow days reported by The Block. When ETF inflows are strong, RSI can stay hot longer. When inflows fade and RSI diverges, the setup becomes more fragile.