High Quality Content by WIKIPEDIA articles! The Treynor ratio is a measurement of the returns earned in excess of that which could have been earned on an investment that has no diversify-able risk. investment (i.e. Treasury Bill or a completely diversified portfolio) (per each unit of market risk assumed). The Treynor ratio (sometimes called reward-to-volatility ratio) relates excess return over the risk-free rate to the additional risk taken; however systematic risk instead of total risk is used. The higher the Treynor ratio, the better the performance under analysis.