Conversion rate is the percentage of visitors who take a specific action you want them to take. You calculate it by dividing the number of conversions by the number of visitors, then multiplying by 100.
A "conversion" is whatever counts as success for that page — and you get to define it. For a local service business it is usually a phone call, a completed contact form, a booking request, or a quote inquiry. For an e-commerce store it is a purchase. If 500 people visit a plumber's landing page and 25 call or fill out the form, the conversion rate is 5%.
