Donor retention rate

Donor retention rate measures what percentage of an organization's donors from one year continue giving in the following year. It is the nonprofit-sector equivalent of a customer churn rate, viewed from the positive side, and is widely considered one of the strongest indicators of long-term fundraising sustainability, more so than total dollars raised in any single year.

The formula is donors who gave in both the current and prior period / donors who gave in the prior period × 100, usually calculated annually and often broken out by donor cohort analysis segments such as first-time versus repeat donors, since first-year donor retention is typically far lower than retention among donors who have already given multiple times. This distinguishes it from revenue retention, which weights by dollar amount and can look healthy even while the organization is losing a large number of small donors, masked by a few large ones giving more.

Fundraising teams treat donor retention as a leading indicator because acquiring a new donor costs substantially more than retaining an existing one, and stronger retention compounds into higher lifetime value per donor, the nonprofit analogue of customer lifetime value. Sector-wide retention rates are known to be low, commonly cited as under half of first-time donors giving again, which is why retention analysis segmented by donor tenure, gift size, and acquisition channel is standard practice rather than tracking one blended rate.