Quantum meruit -- literally 'as much as he has earned' -- allows a party to recover the reasonable value of services or materials it provided when there is no enforceable express contract setting the price. It is a restitution-flavored remedy that prevents a recipient from accepting valuable work and then refusing to pay for it.

Courts sometimes describe quantum meruit as a contract implied in fact (inferred from conduct showing an expectation of payment) and other times as a quasi-contractual, restitution-based recovery closely related to unjust enrichment. The label matters less than the function: paying fairly for benefits knowingly received.

A typical quantum meruit claim requires: (1) the plaintiff provided valuable services or goods; (2) for the defendant, who requested or knowingly accepted them; (3) under circumstances that reasonably notified the defendant the plaintiff expected to be paid; and (4) the defendant's failure to pay the reasonable value of what was provided.

The measure of recovery is the reasonable value of the services or goods -- often market rate -- rather than any contract price (since there is no enforceable price term) or the plaintiff's subjective cost.

Quantum meruit is common where parties began performance before finalizing terms, where a contract is unenforceable (for example, for indefiniteness or failing a formality), where work exceeded the scope of an existing agreement, or where a contract was terminated after partial performance. Professionals and contractors frequently rely on it when a client accepts work but disputes the fee.

As with unjust enrichment, a valid and enforceable express contract covering the same services generally displaces quantum meruit -- the plaintiff must sue on the contract. The claim fills the space where no enforceable price agreement exists.

Plaintiffs prove the services rendered, the defendant's request or knowing acceptance, the reasonable expectation of payment, and the market value of the work -- often through invoices, time records, industry rate evidence, and testimony that the defendant knew payment was expected.

Defendants argue the services were gratuitous or volunteered, that they never requested or knowingly accepted them, that no reasonable expectation of payment was communicated, or that an express contract already governs and fixes (or forecloses) compensation. They also contest the reasonable-value figure with competing rate evidence.

Quantum meruit is a classic alternative pleading to breach of contract: if the express contract fails, the provider can still recover the reasonable value of what it delivered. It protects against walking away empty-handed when a deal collapses mid-performance.

As a claim path, its elements form the liability nodes and the reasonable-value determination is a distinct valuation branch, gated by the express-contract-bar defense. In Juricratic you can war-game whether the contract or the quantum meruit branch controls, dialing the enforceability of any agreement and the strength of the market-rate evidence, and compare the modeled recoveries. The dials are exploratory inputs, not predictions.