Most charities don't have a metrics problem. They have a prioritisation problem. Tracking 23 KPIs in a spreadsheet doesn't make you data-driven, it makes you tired. This guide flips the usual reference list on its head: start with the 5 metrics every charity should track first, then use the full 23-metric breakdown as a reference when you're ready to go deeper.
In this article:
Why most charities track the wrong metrics (and what to do instead)
Walk into the average small charity and you'll find a spreadsheet with 20-plus columns no one looks at. The list grows because every conference talk, board meeting, and CRM demo adds another "must-track" KPI. The list stops being useful the moment it stops fitting on one screen.
The average small UK charity today runs a fundraising platform, a ticketing platform, a CRM, and a spreadsheet, four sources for the same 4 to 6 numbers.
The frame that actually helps: leading vs lagging KPIs. Leading KPIs predict future outcomes (donor engagement rate, retention rate, donation growth, recurring sign-ups). Lagging KPIs measure past performance (average gift size, event attendance, fundraising ROI). You need a handful of each, not 20 of either.
According to Zeffy's donor behaviour research, the charities that grow donor revenue year on year aren't the ones tracking the most metrics. They're the ones tracking the same 4 to 6 metrics every month and acting on what those numbers tell them.
The 5 metrics every charity must track first
If you only track five things, track these. Each one answers a different strategic question, and together they cover acquisition, retention, efficiency, and sustainability.
1. Donor retention rate
Why it matters: retention is the single most predictive metric for sustainable growth. Industry consensus across charity fundraising research suggests retention is significantly cheaper than acquisition, so a one-point gain in retention compounds for years. The Fundraising Regulator's Code of Fundraising Practice (effective 1 November 2025) sets stewardship expectations that reward long-term donor relationships. Retaining an existing UK taxpayer donor is especially valuable: with Gift Aid, every £1 given returns 25p to the charity at no cost to the donor.
Benchmark to compare against: Zeffy's cross-platform data puts average charity donor retention in the 40 to 45% range. If you're under 40%, retention is your highest-leverage starting point.
Formula: (Donors who gave both this year and last year / donors who gave last year) x 100.
The data behind this number lives wherever you record gifts. Zeffy's free donor management system tracks giving history by donor automatically, so you can pull the calculation without rebuilding a spreadsheet each year.
2. Average gift size
Why it matters: a rising average gift size with a stable donor count means your stewardship is working. A flat or falling average usually means you're acquiring lower-capacity donors and not upgrading them.
Formula: total donation amount / number of donations.
3. Donor acquisition cost
Why it matters: if you don't know what a new donor costs, you can't tell whether your ads, events, or peer-to-peer campaigns are worth repeating. Calculate per channel, not in aggregate.
Formula: acquisition spend on a channel / new donors from that channel.
4. Fundraising ROI
Why it matters: ROI is your bluntest efficiency check. A campaign that raises £50,000 for £25,000 spent looks healthier than one that raises £100,000 for £80,000 spent, even though the gross is double.
Formula: total revenue / total fundraising expenses.
5. Recurring giving rate (Direct Debit + card)
Why it matters: recurring donors give predictable revenue and stay longer than one-time donors. The percentage of your donor base on a recurring plan is the closest thing fundraising has to a subscription metric. Direct Debit is the largest single giving method in UK charity fundraising, accounting for around 31% of all donations; a recurring base measured in Direct Debit mandates is the most predictable revenue a small charity can build.
Formula: active recurring donors / total active donors x 100.
To grow this number, the lift is operational. Add a clear monthly option to your donation form and steward the recurring base separately. See how a recurring giving programme on Zeffy is set up.
The shape of a healthy retention strategy is sustained form volume plus a growing recurring base. You do not need 23 KPIs to get there. Watch retention and recurring giving every month, and use the rest of the list as context.
Donation metrics: measuring what you raise
1. Gifts secured
Total donations received over a chosen time window. Segment by gift type (major, mid-level, small, recurring, planned) to see which categories are growing.
How to measure: sum all gifts received in the period.
Example: 800 donations received in 2026 means gifts secured for the year is 800. See our guide on major donor fundraising for the upper end of this segmentation.
2. Average donation size
The typical donation amount from a donor group, campaign, or period. Trends in this number reveal the health of your stewardship more clearly than total revenue.
How to measure: total donation amount / number of donations.
Example: 90 donations totalling £3,000 = £33.33 average gift.
3. Donation growth rate
Year-over-year change in donation revenue. A useful lagging indicator of overall programme health.
How to measure: ((this year's donations - last year's donations) / last year's donations) x 100.
Example: £15,000 this year vs £10,000 last year = 50% growth rate. Our guide on donor engagement strategies covers the levers that move this number.
4. Donation frequency
How often donors give in a period. Useful for understanding whether your engagement cadence matches donor appetite.
How to measure: total donations / unique donors.
Example: 400 donations from 200 unique donors = 2 gifts per donor per year.
5. Average giving capacity
An estimate of what donors can give based on past behaviour and (if available) wealth indicators. Used for major-gift cultivation.
How to measure: sum estimated capacities across donors / number of prospects.
Capacity research is typically a paid-tool category (wealth screening). For most small charities, the more useful proxy is the highest past gift from each donor, which lives in your donor record.
6. Gift Aid uplift (UK-specific)
For any UK registered charity with HMRC recognition, Gift Aid is a 25% revenue uplift that most metrics dashboards ignore entirely.
Why it matters: Gift Aid means every eligible £1 donation becomes £1.25 to the charity, with no extra cost to the donor. Tracking your Gift Aid uplift as a distinct KPI keeps this money visible at board level and ensures you're not leaving HMRC claims on the table.
Formula: eligible Gift Aid donations x 0.25 = reclaimable amount.
Example: £10,000 in Gift Aid-eligible donations = £2,500 reclaimable from HMRC.
Also track Gift Aid Small Donations Scheme (GASDS): a 25% top-up on small cash and contactless donations of £30 or less, up to an £8,000 annual cap. No donor declaration required for GASDS. (Charity Tax Group is the technical reference for both schemes.)
Note: Gift Aid does not apply to raffle tickets, event tickets sold at fair value, or donations from people who have not paid sufficient UK income tax or capital gains tax.
Donor relationship metrics: measuring who gives
6. Donor retention rate
Covered above as a top-5 metric. Quick reference:
How to measure: (donors who gave both periods / donors who gave last period) x 100.
7. Donor growth rate
The percentage increase (or decrease) in your active donor base over a period.
How to measure: ((current-year donors - prior-year donors) / prior-year donors) x 100.
Example: 200 donors last year, 250 this year = 25% growth.
8. Donor lifetime value (LTV)
The total amount a donor is expected to contribute across their entire relationship with your charity. The clearest signal of which acquisition channels are actually worth the spend.
How to measure: average donor lifetime (in years) x average gift frequency per year x average gift amount.
Recurring donors typically push this number meaningfully higher than one-time donors, which is why the recurring giving rate is a top-5 metric. The data for LTV lives in your donor history, which is exactly what Zeffy's free donor management system stores by default.
9. Conversion rate
The percentage of people who complete a desired action (donating, registering, signing up) out of those who had the opportunity.
How to measure: completed actions / opportunities x 100.
Benchmark from Zeffy's own data: pre-filled donation forms achieve a 23% average conversion rate on Zeffy, compared to a typical charity donation form conversion of around 15%. If your donation page is converting under 15%, the form itself is usually the lever, not the traffic.
One UK-specific note on form friction: donors expect a Gift Aid tickbox, GDPR consent options, and a visible registered charity number on the form. Missing any of these depresses conversion before the donor even reaches the submit button.
10. Donor acquisition cost
What it costs to bring in a new donor. Calculate per channel.
How to measure: channel spend / new donors from that channel.
Example: £1,000 in social ads producing 50 new donors = £20 per donor. £2,000 in direct mail producing 40 new donors = £50 per donor. See our guide on donor acquisition for channel-by-channel tactics.
11. Donor attrition rate
The percentage of donors who stop giving in a period. The mirror image of retention.
How to measure: lapsed donors / prior-period donors x 100.
Example: 600 donors last year, 100 didn't give this year = 16.6% attrition.
12. Lapsed donor rate
Sometimes called donor churn. Similar to attrition but typically scoped to a longer dormancy window (12 to 24 months).
How to measure: (lapsed donors / total prior-period donors) x 100.
Example: 500 donors total, 100 lapsed = 20% lapsed rate. A high lapsed rate alongside healthy acquisition is a stewardship-and-communication problem, not a marketing problem.
Campaign and event metrics: measuring how you raise
13. Revenue by strategy
Total revenue broken down by channel: events, peer-to-peer, online, direct mail, major gifts, grants. This is the highest-leverage diagnostic for resource allocation.
How to measure: sum revenue per channel for the period, then compare.
14. Fundraising ROI
Revenue raised per pound spent. A value over 1.0 means profit; under 1.0 means loss.
How to measure: total revenue / total fundraising expenses.
Example: £10,000 raised on £200 in costs = 50:1 ROI. Most channels won't get near that; events in particular run lower because of venue, catering, and staff time.
In the UK, ROI is dragged down by three stacked costs on a typical charity: a fundraising platform tip prompt (JustGiving's ~17% default suggested donor tip is the most widely cited example in UK fundraising press), per-ticket fees on event platforms like Eventbrite (around £1.29 on a £10 fete ticket), and card processing. Zeffy removes the platform-fee variable from the ROI denominator entirely.
Cross-channel ROI benchmarks vary widely by organisation size, geography, and methodology, and several commonly cited figures don't hold up under sourcing review. The table below shows what benchmarks are available with credible sourcing; where verified data doesn't exist, the cell notes that.
|
| Online giving | Benchmark unavailable | Varies too widely by org size and form quality for a single figure to be reliable |
| Peer-to-peer fundraising | Benchmark unavailable | Depends heavily on peer network size and coaching investment |
| Events | Benchmark unavailable | Venue, staffing, and catering costs vary too much for a single industry figure |
| Direct mail | Benchmark unavailable | Widely cited ranges have not held up under sourcing review for this article |
| Major gifts | Benchmark unavailable | ROI depends on staff time allocation, which most orgs don't track per-gift |
For your own organisation, compute ROI per channel and compare year over year. That internal benchmark is more useful than any industry average. One operational note: platform and processing fees show up in the denominator of every channel's ROI. Switching event ticketing to a fee-free event ticketing setup removes one fee variable from the calculation entirely.
15. Cost per pound raised (CPLR)
The inverse of ROI: pence spent per pound raised. Useful when communicating efficiency to boards and grantors.
How to measure: channel expense / channel revenue.
Example: £4,000 spent to run an event that raised £40,000 = £0.10 CPLR.
16. Online gift percentage
The share of total revenue that comes through digital channels. Useful for spotting whether your offline-to-online migration is keeping pace with donor behaviour.
How to measure: online donations / total donations x 100.
Example: £4,500 online out of £15,000 total = 30% online gifts.
17. Event follow-up conversion rate
The percentage of event attendees who take a follow-up action (donate, join monthly giving, volunteer). This is the metric that separates an event from an isolated party.
How to measure: attendees who took the action / total attendees x 100.
Example: 60 of 80 quiz-night attendees donated afterwards = 75%.
18. Event attendance rate
Attendees vs invites sent. A diagnostic for promotion, timing, and pricing.
How to measure: attendees / invites x 100.
19. Revenue per attendee
Average contribution per event participant. The clearest measure of whether your event is generating enough per head to justify the cost.
How to measure: total event revenue / attendees.
Example: £20,000 raised at an event with 200 attendees = £100 per attendee.
Digital engagement metrics: measuring your reach
These are supporting metrics, not core fundraising KPIs. They tell you whether your top-of-funnel content is healthy enough to feed acquisition and retention work.
20. Email open rate
The share of recipients who opened a campaign email. Useful for testing subject lines, send times, and list health, but increasingly noisy thanks to privacy-protection features in modern email clients (which pre-fetch images and inflate opens).
How to measure: opens / delivered emails x 100.
Benchmark numbers vary widely by sector and audience; compare against your own prior-period averages rather than chasing an industry figure.
21. Email click-through rate
The share of opens that clicked a link. A cleaner signal of engagement than opens, because clicks aren't inflated by privacy protections.
How to measure: clicks / opens x 100.
Example: 40 clicks on an email opened by 120 people = 33.3% CTR.
22. Website sessions
Unique visits to your site in a period. The cleanest top-of-funnel volume metric.
23. Social media engagement rate
Likes, shares, comments, and clicks across your social channels, expressed as a percentage of reach or followers.
Most native platform analytics include this calculation by default. Use it to spot which content types deserve more of your time.
How to choose the right metrics for your charity
The right starter set depends on where your organisation is in its lifecycle.
Pre-registration / community groups (village halls, PTAs, CICs, unincorporated associations)
If you are an unincorporated association, CIC, PTA, or village hall committee, you cannot yet claim Gift Aid or access most charity fee tiers. Retention and LTV require multi-year history most pre-registration groups don't yet have. Focus on:
- Total raised, so you have a clear picture of what your community generates.
- Average gift size, so you can set realistic revenue projections.
- Conversion rate on your donation page or collection method, to improve the mechanism before you scale it.
Register with the Charity Commission for England and Wales (income above £5,000), OSCR (Scotland, all sizes regardless of income), or CCNI (Northern Ireland) to unlock Gift Aid and charity fee tiers.
New charities (under 2 years)
You don't have enough historical data for retention or LTV to mean much yet. Focus on:
- Donor acquisition cost per channel. You need to know what works before you scale anything.
- Conversion rate on your donation page. Fix the form before you buy traffic.
- Average gift size, so you can set realistic revenue projections.
Growing charities (2 to 5 years)
You have a donor base. The question is whether you're keeping it. Focus on:
- Donor retention rate. Compare against the 40 to 45% Zeffy benchmark.
- Donor lifetime value. Tells you which acquisition channels are worth doubling down on.
- Recurring giving rate. The single fastest way to stabilise revenue.
Established charities (5+ years)
You have data and channels. The question is efficiency and diversification. Focus on:
- Fundraising ROI by channel.
- Revenue by strategy to spot over-reliance on any single source.
- Lapsed donor rate to catch erosion early.
The simple diagnostic: if you don't know your current donor retention rate, start there. It tells you more about your organisation's health than any other single number.
How to track these metrics without spreadsheet chaos
Most small charities track metrics by hand in a spreadsheet someone updates once a quarter, when they remember. The errors compound, the formulas break, and by the time the board asks for a number, no one trusts it.
The fix isn't a £30-a-month membership CRM subscription. The fix is putting your fundraising data in one place that calculates these metrics for you, so the spreadsheet becomes optional.
- Donor retention rate and lapsed donor rate: pulled from giving history stored in Zeffy's free donor management system.
- Donor lifetime value: computed from cumulative giving by donor record.
- Donor acquisition cost by campaign: when you run acquisition through Zeffy forms, the new-donor count is in the dashboard; you supply the spend.
- Online gift percentage: all online giving on Zeffy is captured by default.
- Conversion rate: Zeffy's donation forms surface form-level conversion.
- Gift Aid claim readiness: exportable donor and declaration data to submit via HMRC Charities Online. Zeffy stores the declaration alongside the gift so records meet HMRC's 6-year retention rule.
Zeffy serves as the system of record where the numerator and denominator of your KPIs live, fee-free, in one dashboard. For most small charities, that system of record is the missing piece. Custom dashboard builders, predictive churn models, and wealth-screening tools can come later.
Putting your metrics to work: a monthly review checklist
The single highest-leverage habit in fundraising operations is a 30-minute monthly metrics review. Copy the checklist below into a doc, calendar it for the first Monday of every month, and run it.
Monthly metrics review (copy-paste)
MONTHLY FUNDRAISING METRICS REVIEW
Date: __________
Reviewer: __________
- 1. DONOR RETENTION RATE, This month: ____% Last month: ____% Action if down: review lapsed-donor list, send re-engagement.
- 2. AVERAGE GIFT SIZE, This month: £____ Last month: £____ Action if down: check whether new-donor mix is shifting smaller.
- 3. DONOR ACQUISITION COST (by channel), Best-performing channel: __________ (£____/donor). Worst-performing channel: __________ (£____/donor). Action: shift next month's spend toward the best channel.
- 4. FUNDRAISING ROI (by channel), Highest-ROI channel: __________ (____:1). Lowest-ROI channel: __________ (____:1). Action if any channel under 1:1: review or pause.
- 5. RECURRING GIVING RATE, This month: ____% Last month: ____%. New monthly donors this month: ____. Action: confirm welcome series for new monthly donors triggered.
NOTES / DECISIONS:
________________________________________
________________________________________
You don't need to act on every metric every month. The point is to notice movement early enough to do something about it. Tracking 5 metrics consistently beats tracking 23 metrics sporadically.
Frequently asked questions
How do I calculate donor lifetime value?
Multiply average donor lifetime (in years) by average gift frequency per year, then by average gift amount. A donor who gives twice a year for 4 years at £25 a gift has an LTV of 4 x 2 x £25 = £200. With Gift Aid, that £200 becomes £250 to the charity. Recurring donors push LTV meaningfully higher than one-time donors, which is why growing your recurring giving rate is the fastest route to a healthier LTV across the board.
How can charities improve their fundraising ROI?
Focus first on the cost side of the denominator. In the UK, three costs drag ROI down on most channels: platform tip prompts on fundraising platforms, per-ticket fees on event ticketing, and card processing. Removing the platform-fee variable entirely (by using a free platform) is the fastest single move. Beyond that: claim Gift Aid on every eligible gift, a 25% uplift with no acquisition cost, and add GASDS on small cash and contactless donations of £30 or less (up to the £8,000 annual cap). Both are reclaimed from HMRC and improve your net revenue per pound raised at no cost to the donor.
Which fundraising metrics matter most for a small charity?
Start with five: donor retention rate, average gift size, donor acquisition cost (per channel), fundraising ROI, and recurring giving rate. These five together cover acquisition, retention, efficiency, and sustainability. If your organisation is not yet a registered charity (unincorporated association, CIC, PTA, village hall), focus on total raised, average gift size, and conversion rate until registration unlocks Gift Aid and charity fee tiers.
How do I track fundraising metrics without a complex CRM?
Put your fundraising data in one place that calculates the metrics for you. A platform that stores giving history by donor, captures Gift Aid declarations, and surfaces form-level conversion removes the manual spreadsheet step. Zeffy does this at no cost: donor retention, LTV, acquisition cost by campaign, online gift percentage, and conversion rate are all derived from data the platform stores by default. For most small charities, the system of record is the missing piece, not the analytics tool on top of it.
Should I track Gift Aid separately as a KPI?
Yes. For any UK registered charity with HMRC recognition, Gift Aid is a 25% revenue uplift that most metrics dashboards ignore. Track three things: (a) the percentage of donations with a valid Gift Aid declaration, (b) total Gift Aid reclaimed year to date, and (c) time from donation to claim submission. HMRC gives you 4 years to claim; charities that leave money unclaimed are a common finding in trustee reviews. GASDS adds a further 25% top-up on small cash and contactless donations of £30 or less (£8,000 annual cap) with no declaration required. See HMRC's Gift Aid guidance and the Charity Tax Group for the technical detail.
How often should a charity review its fundraising metrics?
Monthly is the minimum for the five core KPIs. A 30-minute monthly review, calendared for the first Monday of each month, is enough to spot movement early and act on it. Quarterly, review the full set of metrics relevant to your lifecycle stage. Annually, present a full metrics summary to your board of trustees alongside the annual return and Trustees' Annual Report and Accounts (TAR). Tracking 5 metrics consistently every month beats tracking 23 metrics sporadically every quarter.
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