Lexical Definition

‎שָׁעַר‎ shâʻar (shaw-ar') to calculate ^H:V
a primitive root; to split or open, i.e. (literally, but only as denominative from ‎שַׁעַר‎); compare see ‎שׁוֹעֵר‎

think.

• to act as gatekeeper
• (figuratively) to estimate

1) to split open, reason out, calculate, reckon, estimate
1a) (Qal) to calculate Pr 23:7

Brown-Driver-Briggs

II. ‎שָׁעַר‎ verb calculate, reakon (Late Hebrew Pi`el Jewish-Aramaic Pa`el put a valuation, estimate; Jewish-Aramaic ‎שַׁעֲרָא‎ interest, market-price; Arabic market-price is loan-word Frä¹⁸⁹); —

Qal Perfect 3 masculine singular ‎בְּנַפְשׁוֺ כֶּןהֿוּא‎ ‎׳‎‎כְּמוֺשֿׁ‎ Prov 23:7 as he has calculated in his soul, so is he, but dubious: De ‎שֹׁעֵר‎ as one who calculates; more radical conjectures in Bi Toy.

Brown-Driver-Briggs References