Logo Churn Calculator

The logo churn calculator measures the share of customers you lost over a period, counting each account as a single logo no matter what it pays. Logo churn is the mirror image of logo retention, and it is a count based metric rather than a revenue weighted one, so it answers a direct question, how many of the customers you began with have left. You enter your customers at the start of the period, the number lost during it, and whether the period is monthly or yearly, and the tool returns the period churn rate as a percentage plus an annualised figure so you can compare windows on the same footing. The base formula is the customers lost divided by the starting customers, multiplied by 100. To annualise a monthly rate the tool compounds it across twelve months, since losing a fixed share each month adds up to more than that share times twelve. Founders, customer success leaders and finance teams track churn because every lost logo erodes recurring revenue and raises the cost of growth, and a rising churn rate is often the earliest warning that something is wrong with the product, pricing or service. A few good-practice tips will keep your reading sound. First, count only customers present at the start and exclude any won during the period, so churn is not masked by new sales. Second, keep your period definition consistent, and use the annualised figure when comparing across different timeframes. Third, pair logo churn with revenue churn, because losing many small accounts and losing one large account look the same in logo terms but have very different financial impacts. Used regularly, this calculator gives you an early, repeatable signal of customer loss.

Churn = customers lost / starting customers. Monthly rates are annualised by compounding over 12 months. Estimate only, not financial or tax advice.