About this tool
CTR Calculator is a free, in-browser tool for the click-through rate of an ad, email or search listing. Pick whether to solve for CTR, clicks, or impressions; the field being solved is hidden and the other two drive the result. All math runs locally in your browser and nothing is uploaded.
Click-through rate is CTR = clicks ÷ impressions × 100, expressed as a percentage. Rearranged, clicks = CTR ÷ 100 × impressions and impressions = clicks ÷ (CTR ÷ 100). The tool shows the solved value first and echoes the two known figures beside it.
Use it to benchmark creative performance, to estimate the clicks a known impression volume should generate at a target CTR, or to reverse-engineer how many impressions produced a given click count. The rate is shown with a percent suffix and the counts as whole numbers.