How we score

Comparing ways to help animals is hard and uncertain. So we keep the scoring simple, show our reasoning for every listing, and you can disagree with it.

The formula

Each question gets a rating from 1 to 3, and all four count equally.

Question	What it asks	1 / 2 / 3
Scale	How many animals would this affect?	Big / Huge / Massive
Severity	How much suffering would it reduce per animal?	Moderate / Serious / Extreme
Chance of success	How likely is this to work?	Long shot / Plausible / Likely
Your difference	How much does one more person change the result?	Small / Moderate / Large

For scale, Big means under 1 million animals, Huge means 1 million to 10 million, and Massive means over 10 million.

The score is the percentage of the maximum 12 rating points. For example, ratings that add up to 9 score 75. The lowest possible score is 33.

For ranking only, opportunities closing within 14 days get a 15% boost and those closing within 30 days get 5%.

Our sources

We find opportunities by checking these sites:

What this can't tell you

The ratings are informed judgment, not measurement. Reasonable people would rate them differently.
Equal weights are simple, but they're still a choice, as are the four questions and where the scale's lines sit.
Comparing welfare across species is deeply uncertain.
Campaign pages often describe their own importance. We try to attribute those claims, but we can miss things.
AI can make mistakes. Check the sources before you act, especially eligibility and deadlines.