The calculator does thermal only, and apparently for a ground detonation.
These will get closer to reality, if you can run DOS programs. A little geekier and not as pretty, but if you really want to plan against a nuke going off near you, it’s the way to go.
I have the circular slide rule that came with the Glasstone book, plus some specialized models. I found that even being 20 miles away from an “optimum burst height” blast can break glass and scorch things.