How to Calculate Donor Retention Rate

Your donor retention rate is the percentage of donors who gave in one year and gave again the next. To calculate it, divide the number of last year's donors who also gave this year by the total number of donors you had last year, then multiply by 100. If 90 of last year's 200 donors gave again, your retention rate is 45%. That single number is the most honest measure of whether your fundraising is building a base or quietly leaking one, and most small shops can compute it from a spreadsheet export in under an hour.

The reason it matters is arithmetic. Acquiring a brand-new donor costs far more than re-soliciting someone who already believes in your mission. Bloomerang's donor retention research notes that "if a new donor gives only once, as nearly 70% do, then you're often left with a loss on your initial investment" to acquire that person. A director who lifts retention by ten points often raises more total revenue than one who runs a flashy acquisition campaign, because retained dollars compound year over year.

The exact formula, with a worked example

The standard donor retention rate formula is straightforward and used sector-wide:

Donor Retention Rate = (Donors retained this year / Total donors last year) x 100

"Retained" means a donor who gave in the prior period and gave again in the current period. The denominator is everyone who gave in the prior period, full stop. You are not counting dollars here. You are counting distinct people (or households, if you de-dupe spouses). A $5,000 major donor and a $25 first-timer each count as exactly one.

Worked example. A literacy nonprofit had 312 distinct donors in 2024. In 2025, when the team pulled the list of everyone who gave again, 141 names overlapped with the 2024 file. Retention rate = (141 / 312) x 100 = 45.2%. That is the headline number for the board. It tells you nothing yet about why, but it tells you precisely what, and the "what" is the foundation for every conversation that follows.

As a rule of thumb, sector-wide donor retention often sits below half of all donors, which is why the topic gets so much attention. You can track the current national figures yourself in the Fundraising Effectiveness Project's quarterly reports, which publish overall, new-donor, and repeat-donor retention every quarter. So a 45.2% blended rate is a believable result for a small organization, but still well short of where a healthy program wants to be. Treat any single benchmark as a loose reference, not a target carved in stone. The figure that matters is your own number moving in the right direction over time.

The Three-Bucket Retention Check

The blended retention rate hides the most actionable insight in your file: new donors and repeat donors behave like two completely different populations. First-time donors retain far worse than multi-year donors, because many first gifts are one-off, campaign-driven, or made on a friend's behalf. Blend those two groups together and you get a number that is true on average and useless for decisions.

The fix is what we call the Three-Bucket Retention Check: instead of reporting one blended figure, you run the identical formula three times, just changing who sits in the bucket.

• New donor retention: of people whose first-ever gift was last year, what share gave again this year. This grades your welcome and second-gift strategy.
• Repeat donor retention: of people who had already given in two or more prior years, what share gave again. This grades your stewardship of your loyal base.
• Reactivated donor count: people who lapsed (skipped a year or more) and came back. These do not belong in your retention denominator, but tracking them separately keeps you from confusing a rebound with steady loyalty.

The split between these buckets is dramatic. National data consistently shows new-donor retention running near 19% while repeat-donor retention lands around 69%, and the literacy nonprofit above saw the same shape in its own file. The blended 45% had masked a real problem: its first-gift experience was failing while its core supporters stayed rock solid. That diagnosis pointed straight at a fix, a structured second-gift campaign, that a single aggregate number would never have surfaced.

How to track it across giving years without a data team

Retention only becomes useful when you watch it move. A one-time 45% is a snapshot; a 45% that has climbed from 38% over three years is a trajectory, and trajectory is what convinces a board to keep investing in stewardship. Between annual checks, the best teams also watch second gifts from new donors and lapsing donors who can still be saved before the year closes.

The mechanics are simpler than most small shops fear. Define your "giving year" once and never change it, whether you use the calendar year or your fiscal year. Each year, pull two donor lists, the prior year and the current year, with a unique donor identifier on each row. Match them, count the overlap, apply the formula, and record the result in a running table alongside the new and repeat splits. Five rows of history is enough to see a trend.

The common failure is not the math; it is the matching. Duplicate records, "Bob Smith" in one year and "Robert Smith" in the next, or a gift logged to a spouse, silently understate retention and make a stable program look like it is collapsing. Clean your donor identifiers before you trust the trend line. One director at a 12-person arts nonprofit found her "declining" retention was entirely a deduplication artifact: once households were merged correctly, a supposed 6-point drop became a 2-point gain.

This is where a purpose-built view earns its keep. Rather than rebuilding a spreadsheet every quarter, many small nonprofits use a donor tracker template that surfaces retention, new-vs-repeat splits, and lapsing donors as a live dashboard, and on plans where AI-assisted insights are included, you can simply ask the data which donor segment is slipping. You can see the available plans to find the tier that fits your budget.

A donor retention rate is the rare nonprofit metric that is cheap to calculate, hard to fake, and directly tied to revenue. Compute the blended number first, immediately run the Three-Bucket Retention Check, then watch all three buckets across giving years. The organizations that retain donors are not the ones with the biggest campaigns; they are the ones that know their retention number cold and act on what it tells them.

Frequently Asked Questions

What is a good donor retention rate for a small nonprofit?

There is no universal "good" number, but as a rule of thumb the sector-wide average tends to sit below half of all donors, so a blended rate above 45% is a reasonable working target. More important than the absolute figure is the trend: a rate that is climbing year over year signals healthy stewardship, even if it starts below average. New-donor retention will always run far lower than repeat-donor retention, so judge each segment against itself rather than against one headline benchmark.

How do I calculate donor retention rate without expensive software?

You only need two donor lists with a unique identifier on each, the prior giving year and the current one, which most CRMs and even spreadsheets can export. Match the lists, count how many prior-year donors also appear in the current year, divide by the total prior-year count, and multiply by 100. The hardest part is de-duplicating constituents so the same person is not counted as two different donors, which would understate your retention.

Should I measure donor retention by number of donors or by dollars?

Measure by number of distinct donors for the core retention rate, because the metric is about whether relationships persist, and a single major gift can otherwise distort the picture. Track dollar retention (revenue retained from last year's donors) as a separate, complementary number. The gap between the two is often diagnostic: it tells you whether you are keeping people, keeping money, or both.

What is the difference between new donor retention and repeat donor retention?

New donor retention measures the share of first-time donors who give a second gift the following year, and it is typically very low because many first gifts are one-off or made on a friend's behalf. Repeat donor retention measures supporters who have already given across multiple years and is usually far higher, since they have demonstrated genuine commitment. Calculating them separately tells you whether to invest in a better second-gift experience or in stronger stewardship of your loyal base.