What Is RSI (Relative Strength Index)?

RSI measures the speed of recent price moves on a 0 to 100 scale, usually over 14 periods. Readings above 70 are often called overbought and below 30 oversold.

Why it matters for investors

RSI helps spot stretched moves, but strong trends can stay overbought for long periods. It works best combined with trend and volume, not alone.

Common questions

Is RSI above 70 a sell signal?

Not by itself. It shows strong momentum; many traders wait for price confirmation before acting.