1 gigaton = 1,000 megatons = 1,000,000 kilotons.
ten 475 KT weapons = ten 0.475 MT weapons = total 4.75 MT yield (in theory).
A 5-7 gigaton attack would require 5,000-7,000 1MT warheads, or 10,000-14000 0.5MT warheads - beyond the present capabilities of the US and Russia combined.
Based on the Glaser link, a 20 MT attack (in theory) would take out 100% of Iran's population - and much more, depending on the weather conditions at the time of the attack.
Turning Israel into glass would take much less - one can infer they (IDF) would launch on a verified launch from Iran and not wait to see whether the incoming was nuclear or non-nuclear. MAD, indeed, but what alternative would their missile officers have.
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