What does prorate mean?
Prorate means to divide a total proportionately, usually by calculating each party's share according to a defined ratio. The verb is common in financial, legal, and administrative settings, as in prorating rent, costs, fees, or insurance premiums. For example, if two people share a bill but one has paid only half the period covered, the amount may be prorated so that each person pays only for the relevant share. The word conveys a systematic and proportionate calculation, rather than a casual or approximate division. Its use suggests fairness based on an objective or agreed measure, such as time, occupancy, usage, or another formula. Though it is especially associated with business and formal writing, it is also used in everyday discussions of subscriptions, shared accommodation, and household expenses.
verbTo divide or distribute something proportionately, especially costs, payments, or shares, according to an agreed ratio.
- To divide or distribute a total amount proportionately among multiple parties or according to a defined ratio.
"The company agreed to prorate the rent for the months when the office was closed."
"The two organizations will prorate the shared expenses according to the number of employees each has."
"When the subscription was cancelled, the service prorated the final monthly charge."
To prorate is to make everyone share a bill in exact proportion, turning one total into a set of fair shares.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does prorate come from?
The word was formed in the early 19th century from the prefix pro- and the word rate. Its underlying vocabulary comes through French and Latin from the Latin root ratio, meaning a relation or proportion. The same broad root is reflected in rate, ratio, rational, and ration, though the exact history and sense development of each word varies.
Related word forms
How prorate is actually used
The word is formal and especially common in legal, financial, administrative, and business contexts. It generally implies division according to an established or mutually accepted proportion rather than an arbitrary split.