Relative Strength

Relative strength is a technical analysis measure that compares the performance of a security, index, or other asset against a chosen benchmark over a specific period. It indicates whether the asset is outperforming or underperforming its reference point, helping traders and investors gauge momentum and identify potential leaders or laggards in the market.

How It Works

To calculate relative strength, the price change of the asset is divided by the price change of the benchmark, often expressed as a ratio or percentage. A value above 1 (or 100 %) signals that the asset has gained more than the benchmark; a value below 1 indicates weaker performance. Analysts may smooth the ratio using moving averages to reduce noise, creating a relative strength line that can be plotted alongside price charts. When the line rises, the asset is strengthening relative to the benchmark; when it falls, it is weakening. Divergences between the asset’s price and its relative strength line can foreshadow trend changes.

Why It Matters

Relative strength helps market participants identify which securities are exhibiting the strongest momentum, a key factor in trend‑following strategies. For example, if a technology stock shows a relative strength reading of 1.25 against the S&P 500 over the past three months, it has outperformed the index by 25 %, suggesting it may continue to lead unless the ratio reverses. Portfolio managers use relative strength to allocate capital to outperforming sectors or to avoid assets that consistently lag their benchmarks, thereby enhancing risk‑adjusted returns.