This is a neat little tool. Commenting to boost the algo because it doesn't deserve to get bumped off the front page and I want to see HN poke holes in it or offer support!
https://www.microcovid.org/ is a similar tool, with more knobs to adjust risk factors (distance, outside vs inside, the other person's risk profile, etc.). Friends living in shared apartments have used it to budget, estimate and manage their risk from different activities. Seems like a neat tool.
For a more granular COVID-19 event risk calculator, see also this tool from the Max Planck Institute for Chemistry that was shared here a day or two ago:
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[ 1.9 ms ] story [ 23.3 ms ] threadhttps://www.mpic.de/4747361/risk-calculator?en
https://news.ycombinator.com/item?id=25082527