0.33%

This may be just my preference, but I would tend to say 'point three three percent' to avoid a misinterpretation in the listener of 'thirty-three percent' (i.e., 33%-- without the 'point'). On the other hand, I'm not sure that's any less likely to be misheard.

I would say "one-third of one percent". If you need the accuracy, use the above suggestion.

I see,Thank you~!

The suggestions above are fine.
Personally, I might even read it "thirty-three hundredths percent".
Likewise, sometimes I read "0.7%" as "seven tenths percent", and so on.
This may just be an idiosyncracy of mine.

Thank you,CalifJim!

Actually there is a rule, a mathematical rule that states the numbers after the decimal point are to be read one digit at a time. Not as a group. And I believe this rule transcends languages. Don't ask me what the rule is...that was a long time ago.

So 0.33% can be read as:
point three three OK
zero point three three OK

But not as:
point thirty-three NO
zero po

Got it![Y]

CJ, it's not your idiosyncracy...that's how you read the fraction! For instance 7/10 is read as seven over ten or seven tenth.

Sorry I couldn't pass up this opportunity to correct you on something!

VorparI would say "one-third of one percent".

Okay wise guy. Then how would you say 0.485697887273 using your method?

Sorry Vorpar, this was too good to pass up!!

I think one-third of one percent is ok ,if it's 0.33(333..)