I've made a calculator which I'm looking to get some feedback on. I don't think I've ever seen anything similar.
It's purposefully simplified, yet I still think it's quite illuminating.
I'm also being purposefully vague, as the impact is in not knowing what the calculator is about before using it, as that will bias the results. I will put a more detailed description in the comments at a later time.
https://docs.google.com/spreadsheets/d/1swVTkw-1K5vy-8MDHkDXVOJyHnKvMjgwdRQ9U5d8PvM/edit?usp=sharing
This calculator was inspired by a conversation with Brenton Mayer at the EA Global conference in Melbourne, 2015.
Interesting idea. Main thing that bothers me is the conflation between "animal lives" and "animal life-years". It's standard in development economics to use life-years as the relevant measures, not total amount of deaths-averted. So I think using life-years as the measure would result in more accurate results (e.g. ask how much a person is willing to pay to save 15 years of pig-life).
I completely agree, but see my other comments about the relationship of accuracy/rigour vs impact.