RSPB vs BTO
In short: The RSPB conserves birds and other wildlife by managing nature reserves, recovering species and campaigning. The BTO is a research charity whose volunteer bird surveys produce data used in official statistics. They run some surveys together.
Last reviewed by CharityCompare editorial.
Both work for birds: the RSPB mainly through conservation and land management, the BTO mainly through research based on volunteer surveys. The RSPB had 1.16 million members in 2024/25 and manages 222 nature reserves covering 158,651 hectares. The BTO’s volunteers gave 2,643,682 hours, and its Breeding Bird Survey trends, run with the JNCC and the RSPB, are official government statistics.
RSPB vs BTO: key differences
| What to compare | ROYAL SOCIETY FOR THE PROTECTION OF BIRDS | THE BRITISH TRUST FOR ORNITHOLOGY |
|---|---|---|
| Registered work and operating model | Conserving wild birds, other wildlife and habitats through nature reserves, species recovery, science and campaigning. | Ornithological research based on volunteer surveys, with data made available to government and published in scientific literature. |
| What to consider | Its 222 reserves and 158,651 hectares come from an infographic that does not say whether all are in the UK; elsewhere it says it manages more than 200 UK reserves. It has more than 13,000 volunteers. | Its volunteer hours rose mainly because it changed how BirdTrack time is calculated, and its report gives two different totals. Contract work, including for government bodies, brought in £4,618,000 in 2024/25. |
| Access and practical checks | Visit its nature reserves, join or volunteer, including with Local Groups. It is registered in England and Wales and in Scotland, and is a partner in BirdLife International. | Take part through surveys such as the Breeding Bird Survey, BirdTrack or Garden BirdWatch; bird ringing needs a trainer and a permit. It is registered in England and Wales and in Scotland. |
| Sourced result or evidence gap | 138: Booming Bitterns recorded on RSPB nature reserves, up from 116 in 2023. Reported in 2024/25. A charity-reported monitoring count for its own reserves, not a UK population total. | Close to 120: Common land-bird species whose population trends it reports each year from the Breeding Bird Survey. 2024/25. These trends are official government statistics; the survey is run with the JNCC and the RSPB, so it is not the BTO’s output alone. |
What the latest filings show
Figures from the accounts held in our dated dataset; the live register may contain newer filings. Ratios can span multiple years, as labelled. Clarity scores use our methodology. Cost to raise £1 of donations is not part of the score; legacies make it lumpy, and it is withheld where trading costs would distort it (how it works).
| Metric | ROYAL SOCIETY FOR THE PROTECTION OF BIRDS | THE BRITISH TRUST FOR ORNITHOLOGY |
|---|---|---|
| Latest accounts year in our snapshot | 2025 | 2025 |
| Financial snapshot refreshed | 2026-09-06 | 2026-09-06 |
| Ratio reporting window | 3-yr avg | 3-yr avg |
| Overall score | 90/100 (5★) | 93/100 (5★) |
| Accountability & Finance | 100/100 | 100/100 |
| Spend on charitable activities | 75% of expenditure | 79% of expenditure |
| Fundraising efficiency | £4.1 total income per £1 fundraising (2023–2025, disclosed years) | £6.2 total income per £1 fundraising (2023–2025, disclosed years) |
| Cost to raise £1 of donations | Not shown for 2025: trading income was 23% of donations | Not shown for 2025: trading income was 42% of donations |
| Latest income | £195m | £8.7m |
| Fundraising spend | 25% of expenditure | 16% of expenditure |
| Reserves | 3 months | 4 months |
| Accounts filing | On time | On time |
| Data confidence | high | high |
| Charity number | 207076 | 216652 |
ROYAL SOCIETY FOR THE PROTECTION OF BIRDS on the register · THE BRITISH TRUST FOR ORNITHOLOGY on the register
Considering RSPB
- You want to fund land management and species recovery on nature reserves.
- You want to back campaigning for nature, such as its petition on the farming budget.
Considering BTO
- You want to fund the long-term bird monitoring behind official statistics.
- You would like to volunteer as a bird surveyor.
RSPB vs BTO: questions answered
RSPB or BTO: which should I support?
There is no universal winner. The RSPB manages nature reserves, works on species recovery and campaigns; the BTO runs bird research and monitoring through volunteer surveys. Choose the kind of work you want to fund, then check the accounts period. A financial rating is not an impact assessment.
Do the RSPB and BTO work together?
Yes. They jointly fund the Breeding Bird Survey with the JNCC, BirdTrack is organised by the BTO in partnership with the RSPB and others, and both reports describe joint research. The BTO says the two boards of trustees met together for the first time in 2024/25.
How is BTO data used?
The BTO says its Breeding Bird Survey trends for close to 120 common birds are official government statistics in their own right. Its partnership agreement with the JNCC enables it to work as a government contractor, and contract income was £4,618,000 in 2024/25.
How we score charities +
The Clarity Score is a 100-point rating from UK regulator filings (Charity Commission for England and Wales, OSCR and CCNI). Four pillars — Accountability & Transparency (40), Financial Health (30), Financial Efficiency (20), and Community Support (10) — each scored on a continuous scale, not pass/fail cutoffs. A statutory inquiry sets the score to 0 automatically.
Accountability & Transparency
Scored from filings
40 points — filing history (15), trustee oversight (15, scaling up to a board of three or more), declared policies (10).
Financial Health
Scored from filings
30 points — reserves (15, full marks 3–24 months, tapering on both sides), income stability (10), liabilities to assets (5, scaling down as debt rises).
Financial Efficiency
Scored from filings
20 points — program expense ratio and fundraising cost, each on a graduated scale (not a single cutoff). Kept at 20% of the total: financial-ratio scoring alone is not a reliable effectiveness signal (see "why not just an overhead ratio?" below).
Community Support
Scored from filings
10 points — volunteer-to-staff ratio from Charity Commission workforce data, scaling continuously up to a 2:1 ratio.
Overall score
Sum of all pillar points. Display stars use the same bands as the labels: 90–100 → 5★ Exceptional; 75–89 → 4★ Good; 60–74 → 3★ Needs improvement; 1–59 → 2★ Poor; 0 → not rated.