Anyone have an idea of how the various declensions break down as to number of nouns? I know for example that about 90% of spanish verbs are 1st conjugation, and I’m wondering about Latin nouns.
Seems when I type various English words into the Words program, I get lots of 3rd declensions, 1st declensions, and 2nd declensions, roughly in that order, and then a few stragglers of the 4th and 5th declension. Just curious as to the percentage of nouns of each declension.
Benissimus would know. 
I don’t know the percent breakdowns. I am pretty sure 3rd declension is the biggest, followed by 1st or 2nd, then 4th, then 5th. I was once told that if you knew the first three declensions, you knew 90% of Latin nouns, but I doubt it was based on any actual study.
whiteoctave would know.
the traditional division passed down from age to age is 1:2:3:4:5 / 20%:30%:40%:9%:1%. some time ago i worked out the division for the three commonest letters of Latin and got surprisingly close figures, namely 20.1%:29.8%:41.9%:7.6%:0.6%. the figure overall for 5th declension should certainly be below 1%, for there are only 56 examples of it. both the traditional figure and my own display productivity figures, not frequency: rather than weighing how often each word form is used, each word, whether very rare or very common, is equipollent in the calculation.
~D