Relative Strength Index (RSI) Indicator

Learn how the Relative Strength Index (RSI) momentum oscillator works to identify overbought/oversold conditions, validate trends, and spot potential reversals

Published · Updated · Methodology: Technical Indicators

Part of: RSI Strategies

  • Methodology: Technical Indicators
  • Content type: indicator
  • Markets: Stocks, Commodities

Indicators used

  • RSI

Source video

Decoded from: Relative Strength Index (RSI): What It Is, How It Works, and Formula by investopedia.com — watch the original

Strategy overview

The Relative Strength Index is a momentum oscillator that measures the speed and magnitude of recent price changes on a bounded 0–100 scale. This entry stands apart from most on the site because of its source: investopedia.com's reference explainer "Relative Strength Index (RSI): What It Is, How It Works, and Formula," a piece written to define the indicator itself rather than to sell a way to trade it.

That framing sets the angle. Where a trading channel usually opens with an entry rule, a reference definition opens with the mechanics — what the number actually represents, how it is derived from average gains versus average losses across a look-back window, and why it is confined between 0 and 100. The word "Formula" in the title is the tell: this is the layer most traders skip past, and the one that explains why RSI behaves the way it does at the extremes everyone likes to quote.

Because this is a definitional source and not a system, there is no mechanical rule set to extract here — no entries, exits, or filters to decode. What it offers instead is the vocabulary and the arithmetic that every RSI variant on this site is built on top of: the conventional 14-period reading, the standard overbought and oversold zones, and the reasoning behind those conventions before anyone adapts them. Treat it as the reference you read first, not a strategy you run.

Topics

relative strength index · rsi indicator · momentum oscillator · technical analysis · overbought oversold · trend validation · reversal signals · trading indicator · stocks trading strategy · commodities trading strategy · indicator review · pine script · trading strategy

Frequently asked questions

What does the RSI actually measure?

RSI is a momentum oscillator that compares the size of recent gains to recent losses over a set look-back period and expresses the result on a 0–100 scale. It reads the speed and strength behind a move, not just its direction.

What is the RSI formula based on?

It is built from the average gain and average loss over a look-back window — traditionally 14 periods — combined into a ratio and normalized to a 0–100 range. The Investopedia source centers on this calculation, which is why it walks through the formula rather than a trading setup.

Does this source give me a strategy to trade?

No. It is a reference definition of the indicator — what it is, how it is calculated, and how the standard levels are read. It lays the groundwork for RSI-based strategies but does not spell out mechanical entry and exit rules.

How do I go from understanding RSI to testing a strategy with it?

Start from the definition, then attach a specific rule set and backtest it on historical data before risking capital. Strategy Decoder catalogs RSI strategies extracted from other video sources so you can compare approaches and test them on TradingView.

About this strategy page

This trading strategy was decoded by Strategy Decoder's AI from a public YouTube trading video and turned into a structured, reviewable specification. In the interactive app this page shows the full entry and exit logic, risk management settings, the indicators involved with their parameters, AlgoWizard-compatible logic and a Pine Script export ready for TradingView backtesting — plus an automated backtest verdict when one has been computed for this strategy.

Strategy Decoder catalogs 2,229 decoded strategies. Each one is extracted with confidence scoring, cross-linked to the indicators it uses, and kept up to date as new videos are processed daily. Load this page with JavaScript enabled to use the interactive tools, or start from the strategy explorer to filter by methodology, market and timeframe.

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