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RSI Calculator (Relative Strength Index)

LAST UPDATE: September 2nd, 2018

Calculator

What is RSI (Relative Strength Index)?

RSI (Relative Strength Index) measures the average gain during times when a company’s stock is trading up and compares it with the average loss when a company’s stock is trading down.

RSI is between 0 and 100. A very high RSI is considered to mean that a stock is overvalued, while a very low RSI is considered to mean that a stock is undervalued.

Formula

RSI = 100 – (100 / (1 + (Average Gain During Up Periods / Average Loss During Down Periods)))

Example

A stock has an average gain during up periods of $1.20 and an average loss during down periods of $0.57.

RSI = 100 – (100 / (1 + ($1.20 / $0.57))) = 100 – (100 / (1 + 2.1053)) = 100 – (100 / 3.1053) = 100 – 32.2030 = 67.797

Therefore, this stock has an RSI of 67.797

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