Estimate definition: to form an approximate judgment or opinion regarding the worth, amount, size, weight, etc., of; calculate approximately.. See examples of ESTIMATE used in a sentence. Use this free estimate maker to quickly create estimates online with our professional estimate template. Customize, and download — no account needed. Learn the meaning, pronunciation, grammar and examples of the verb estimate , which means to form an idea of the cost, size, value, etc. of something without calculating it exactly. See also related words and topics in the Oxford Learner's Thesaurus and Dictionary. Master the word " ESTIMATE " in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource.