What is Conversion rate?

Three different newsletter metrics share this name: signup conversion, send conversion, and subscriber conversion.

Newsletter conversion rate is three different metrics wearing one name. Signup conversion measures how well a page turns visitors into subscribers. Send conversion measures how a single email turned readers into buyers or registrants. Subscriber conversion measures what share of the whole list has ever taken a paid action.

Each has a different denominator, moves on a different timescale, and answers a different question. Most conversion-rate confusion, including impossible-sounding benchmarks, comes from comparing one kind against another without noticing.

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