Lexical Definition

‎כָּסַס‎ kâçaç (kaw-sas') to compute H:V
a primitive root

make count.

1) (Qal) to estimate, reckon, compute

Usage: 1 form in 1 verse
Form Translated As     In Verse(s)
תָּכֹ֖סּוּ you will estimate Exod.12.4

Brown-Driver-Briggs

[‎כָּסַס‎] verb compute (perhaps originally divide up, make small, fine; Late Hebrew chew; Aramaic break small (rare), usually (Aph`el etc.) correct, convict; Arabic pulverize; Assyrian kasâsu, perhaps cut in two, or up, whence kissatu, fodder) — only Qal Imperfect 2 masculine plural ‎אִישׁ לְפִי אָכְלוֺ תָּכֹסּוּ עַלהַֿשֶּׂה‎ Exod 12:4 (P) each one according to his eating shall ye compute for the lamb.

Brown-Driver-Briggs References

Book Refs
Exodus 12:4