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Back-of-the-envelope calculation

rough calculation used to find the order of value of a variable rather then the exact value

Pronunciation
/bæk - əv - ðə - ˈɛnvəˌloʊp ˌkælkjəˈleɪʃən/
/bak - əv - ðɪ - ˈɛnvələʊp kalkjʊˈleɪʃən/