Losing 55 donors to gain 60 is not growth. Here is how to calculate what retention is actually costing you — and the four changes that move it fastest.
Most organizations measure how many donors they gained. Almost none measure how many they kept. That single omission is the most expensive blind spot in the sector.
Donor retention rate is simple: of the donors who gave last year, what percentage gave again this year?
Retention rate = (donors who gave both years ÷ donors who gave last year) × 100
The Fundraising Effectiveness Project — the sector's largest donor-transaction dataset, run by the Association of Fundraising Professionals — put overall donor retention at 43.3% for full-year 2025.1 First-time donor retention typically runs far lower (roughly 20–30%), while repeat-donor retention sits closer to 60–70%.2 Retention also rises with gift size: donors giving $5,000–$50,000 retained at 52.0%, and those above $50,000 at 56.6%.1 If you cannot produce this number in under ten minutes, that is itself the finding — you are managing the most important variable in your revenue by feel.
Take an organization with 500 donors giving an average of $400 — $200,000 a year.
| Retention | Donors kept | Revenue retained | Must replace |
|---|---|---|---|
| 40% | 200 | $80,000 | 300 donors |
| 50% | 250 | $100,000 | 250 donors |
| 60% | 300 | $120,000 | 200 donors |
Ten points of retention is worth $20,000 in this example — and, more importantly, removes the need to acquire 50 replacement donors. Since acquiring a new donor costs substantially more than keeping an existing one, the real figure is considerably larger than the revenue line suggests.3
The reframe: you almost certainly do not have a donor acquisition problem. You have a retention problem that acquisition has been quietly papering over.
When donors are surveyed about lapsing, the reasons cluster in a revealing way. Very few say they stopped believing in the mission. The dominant themes are: they never heard what happened to their gift, they were only ever contacted when money was needed, or they simply forgot — nothing kept the relationship alive between appeals.3
Notice what those have in common. They are not conviction problems. They are systems problems. Nobody decided to neglect the donor; the organization simply had no structure that made attention automatic.
Every gift acknowledged within two days, by a real human, naming the specific thing the gift makes possible. Not a receipt. A thank-you. Organizations that implement this alone typically see measurable retention improvement, because it is often the only unprompted positive contact a donor receives.
One month after giving, the donor hears what happened — a photo, a short story, a number. No ask attached. This is the single most under-used move in nonprofit fundraising, and it directly answers the question that causes lapsing: did my gift matter?
Stop sending everything to everyone. At minimum, separate first-time donors, recurring donors, mid-level donors, lapsed donors, and church or institutional partners. Each needs a different message and a different frequency. Unsegmented lists train people to ignore you.
The gap between first and second gift is where most donors are lost. Build a deliberate sequence — thank you, impact, story, invitation to give monthly — and automate it so it happens whether or not anyone remembers.
One warning. Do not launch a major acquisition campaign until retention is measured and the basic stewardship rhythm exists. Acquiring donors into a leaky system is the most expensive mistake in fundraising — you pay full price for people who will be gone within a year.
Where this sits in the Flourishing Framework™. Donor Development work only holds when the layer beneath it is solid. The free Flourishing Index shows you which layer is actually constraining you — in six minutes. Take the Index →
Retention is one stage of a four-stage model. The Kingdom Advancement Model gives your whole team the sequence — and the metrics for each stage.
Get the guide →