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CaseSingularPlural
Nominativeименительный · кто? что?размер размеры the subject: who or what acts
Accusativeвинительный · кого? что?размер размеры the direct object of the verb
Genitiveродительный · кого? чего?размера размеров possession, absence, "of"-phrases
Dativeдательный · кому? чему?размеру размерам the receiver: to or for someone
Instrumentalтворительный · кем? чем?размером размерами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?размере размерах location and topics: in, at, about

Размер is a masculine noun; the ending pattern above repeats across most masculine nouns, so every table you learn makes the next one cheaper.

Look up any other word in the Russian declension tool, see where размер ranks in the most common Russian words, or start from Russian cases explained if the table above is new territory. More vocabulary lives in Russian words by topic and Russian phrases.

12 forms is a table. Using them is a skill.

Slova drills размер and every word like it with typed case endings, checked letter by letter.

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