An analysis tool that is used to compare the price (rate) range of swings in the same direction. It allows the use of three pivot points on the chart, so that the price range between two pivots is measured and projected from a third pivot. The price range of a section is often one of the key ATP ratios of recent sections. The most frequently used percentage price projections are 62%, 100%, and 162%.

This tool is often called a price extension.