English translation: formula for estimating / estimation
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Thanks to everyone for your help - all of the suggestions were good. As soon as I saw the first 2 answers, I realized I shouldn't have had to ask this question -- I guess it was the "Formula for...." that threw me off. What can I say it's Monday morning!
Decided to use "Formula for estimating ..."
Thanks again! 4 KudoZ points were awarded for this answer