What RSI momentum measures
The 14-day RSI is a momentum gauge that runs from 0 to 100. It measures how fast price is moving and how consistently it's moving in one direction.
Standard technical analysis reads the level and stops there, but our tool also tracks how much RSI shifted from one session to the next, and where it was sitting when the shift started.
ΔRSI = RSItoday − RSIyesterday
RSI State = f(RSIyesterday, ΔRSI)the session's read depends on where RSI started and how far it moved
The tool takes two readings, and neither works on its own:
- Starting level: where RSI sat at yesterday's close.
- Today's move: how many points RSI traveled today, and in which direction.
Why one reading isn't enough
Take a +15 point move. If it runs from 25 to 40, the stock is bouncing off oversold and heading back toward neutral. If it runs from 58 to 73, the stock is pushing out of neutral and into overbought. Same +15 move. A tool that only measured the change would treat those as the same event.
Matching criteria
Finding past sessions that started and moved the same way
4 things have to line up for a past session to qualify as a match: RSI began the day around the same level as today, it moved the same direction, it covered a similar distance, and the stock was sitting in a similar spot against its longer-term trend.
The starting level is non-negotiable. A day that opened oversold tells you nothing about a day that opened deep in overbought, so if the starting level is wrong the session is thrown out.
What qualifies as a similar RSI move is set against the ticker's own trading history. A 5-point RSI move is a routine day on a fast-moving name and an unusual one on a steady name, so the same number of points isn't read as the same event across both.
Tool Glossary
The Basics
RSI
The 14-day Relative Strength Index, a momentum reading bound between 0 and 100. It measures how hard and how persistently price has been moving, not where price sits.
RSI move
How many points RSI traveled in a single session, and in which direction.
The Readings
Matched days
The past sessions that met the same conditions you set. Every statistic the tool prints is measured from these and nothing else.
Sample
The number of matched occurrences behind a statistic. A 70% hit rate off 8 occurrences and a 70% hit rate off 400 are not the same claim. The sample is printed next to every result for that reason.