What does estimate mean?
An estimate is an approximate calculation or informed judgment about the value, quantity, cost, or extent of something — a considered guess rather than an exact measurement. The word functions both as a noun ('the builder's estimate came in under budget') and as a verb ('scientists estimate the glacier loses metres of ice each year'). Estimates pervade practical life: contractors price jobs, analysts forecast earnings, and officials tally crowds, all by estimation. Because estimates are inherently uncertain, English speakers routinely qualify them as 'rough', 'ballpark', 'conservative', or 'preliminary'. The word carries no strong emotional charge; it signals pragmatism and honesty about the limits of knowledge. Derived forms include 'estimation' (the act of judging, also meaning esteem, as in 'held in high estimation'), along with 'overestimate' and 'underestimate'. Rooted in the Latin aestimare, 'to value or appraise', estimate shares ancestry with 'esteem', making it etymologically a cousin of respect itself.
An approximate calculation or judgment of the value, number, quantity, or extent of something.
"The initial estimate for the bridge repair was twice the final cost."
Commonly paired with modifiers like 'rough', 'ballpark', or 'conservative' to signal precision.
To form an approximate judgment or calculation regarding the value, amount, size, or duration of something.
"Experts estimate the painting could fetch over ten million pounds at auction."
Regular plural, used when referring to multiple calculations or judgments, often from different sources or at different times.
"The two firms submitted wildly different estimates for the same job."
Every budget ever blown started life as someone's confident estimate.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of estimate
Estimate derives from the Latin verb aestimare (also written aestimare/æstimare), meaning to value, appraise, or fix the worth of something. It entered English in the 16th century, likely via Latin scholarly usage rather than through French intermediaries alone. Its closest cognate is 'esteem', which comes from the same Latin root and preserves the older sense of assigning worth — first to things, later to people. The family also includes 'estimable', describing something worthy of regard.
Related word forms
How estimate is actually used
As a noun it is typically countable and often modified by adjectives like 'rough', 'ballpark', 'conservative', or 'preliminary'. In British English 'in my estimation' is a common formal idiom. The verb is standard in both formal and everyday registers.
Easily confused with estimate
Estimation is the act or process of estimating, while an estimate is the result of that process.
An appraisal is a formal, often expert valuation (as of property), whereas an estimate is any informal or professional approximate calculation.