Benchmark CTR curve
Expected clicks equal monthly search volume multiplied by the benchmark CTR for the position entered. The default curve follows a widely cited Google CTR study: 28.5% at position 1, 15.7% at 2, 11.0% at 3, 8.6% at 4, 7.2% at 5, 6.1% at 6, 5.4% at 7, 4.6% at 8, 4.1% at 9, and 3.7% at 10. You supply volume and position; the tool applies the matching rate and returns expected monthly clicks.