Conversion in tort law is a civil claim you can bring when someone takes, uses, sells, or destroys your personal property without permission, so seriously that they should pay you its full value. The Restatement (Second) of Torts, which courts across the country rely on, defines it as an intentional exercise of control over someone else’s property that interferes so seriously with the owner’s rights that the person responsible should pay the full value of what was taken.1Just Security. Restatement (Second) of Torts 222A – What Constitutes Conversion Think of it as the lawsuit version of theft, with one big difference: you don’t need to prove the other person meant to steal.
What You Have to Prove
A conversion claim rests on three elements. You owned the property or had the right to possess it when the interference happened. The other person exercised unauthorized control over it. That interference caused you harm.
The middle element covers more ground than people expect. Unauthorized control is not limited to physically grabbing something. Selling property that isn’t yours, refusing to give it back, substantially damaging it, or using it in ways the owner never approved can all qualify.
Not every interference rises to the level of conversion. Courts weigh six factors in deciding whether it does: how long the person held onto the property, whether they claimed ownership of it, whether they acted in good faith, how much the owner’s control was disrupted, whether the property was damaged, and how much inconvenience and expense the owner suffered.1Just Security. Restatement (Second) of Torts 222A – What Constitutes Conversion Minor or brief interference without real harm usually falls short, which is where the related claim of trespass to chattels picks up.
Intent Is Narrower Than It Sounds
Conversion is called an intentional tort, and that label misleads a lot of people. You only have to prove the defendant intended to exercise control over the property. You do not have to prove they meant to do anything wrong, knew the property belonged to someone else, or acted with bad motives. Someone who sincerely believed they owned the item can still be liable if they were wrong.
This is where conversion departs sharply from criminal theft. A thief has to know, or at least suspect, that the property isn’t theirs. In a conversion case, honest mistake is no defense. Courts have consistently held that good faith, reasonable care, and ignorance of the true owner’s rights don’t shield a defendant from liability. The only question is whether the defendant intentionally took or used the property and whether they actually had the right to do so.
Buying Stolen Property Without Knowing
This strict approach has a consequence that catches many buyers off guard. If you buy stolen property, you can be liable for conversion even if you had no idea it was stolen. American law follows the principle that a thief cannot pass good title. A buyer gets only whatever title the seller actually had, and a thief had none. Under the Uniform Commercial Code, a purchaser acquires whatever title the seller had the power to transfer, so buying from a thief transfers nothing.2Legal Information Institute. UCC 2-403 – Power to Transfer; Good Faith Purchase of Goods; Entrusting
One important exception applies. If you entrust property to a merchant who deals in that type of goods, and the merchant sells it to a buyer in the ordinary course of business, that buyer gets good title.2Legal Information Institute. UCC 2-403 – Power to Transfer; Good Faith Purchase of Goods; Entrusting Leave a watch with a jeweler for repair, the jeweler sells it, and the customer owns it free and clear. Your claim then runs against the jeweler, not the customer.
What Property Can Be Converted
Conversion applies to tangible personal property, meaning physical items you can pick up and move. Cars, electronics, furniture, tools, jewelry, livestock, artwork. Real property such as land and buildings cannot be converted. If someone is interfering with your land, you are looking at trespass or another real property claim.
Money
Money can be the subject of a conversion claim, but only when it is a specific, identifiable fund with an obligation to handle it in a particular way. A trust account, an escrow fund, or earmarked cash all qualify. A general debt does not. If someone owes you $5,000 and hasn’t paid, that is a breach of contract, not conversion. The money has to be traceable to a specific pool of funds the defendant had no right to touch.
Documents and Securities
Documents that represent property rights, such as promissory notes, stock certificates, and bonds, can be converted. These documents embody the value they represent. Taking a stock certificate is effectively taking the ownership stake in the company.
Digital Assets
Courts have increasingly recognized conversion claims involving digital assets. Federal courts have allowed claims to proceed over misappropriated cryptocurrency, reasoning that crypto functions like other assets and funds that have long been subject to conversion. Claims involving NFTs have also reached the courts, with at least one federal court recognizing that conversion can apply to proceeds from an unauthorized NFT sale. The law here is still developing, but the trend is to treat digital assets with clear ownership rights the same way courts treat other identifiable property.
Conversion vs. Trespass to Chattels
Trespass to chattels is conversion’s less serious sibling. Both involve unauthorized interference with personal property, and the elements are essentially the same. The difference comes down to degree. Minor or temporary interference is trespass to chattels. Interference serious enough that the defendant should pay the full value of the property is conversion.
The distinction controls what you recover. In a trespass to chattels case, damages are limited to the actual harm caused. In a conversion case, you can recover the entire fair market value. A neighbor who borrows your lawnmower without asking and returns it with a dull blade has committed trespass to chattels. A neighbor who borrows your lawnmower and sells it at a garage sale has committed conversion.
When You Must Demand the Property Back First
If the other person came into possession of your property lawfully, most courts require you to formally demand its return before you can sue for conversion. When you ask for the property back and get an outright refusal, that refusal is itself the conversion. Until the demand, the person holding your property may not be doing anything wrong, since they received it with your permission. The demand puts them on notice that their authority to possess it has ended. If someone took your property without permission to begin with, no demand is necessary; the unauthorized taking is already a conversion.
What You Can Recover
The standard remedy for conversion is money equal to the fair market value of the property at the time and place it was converted, plus interest from that date. Fair market value means the highest price a willing buyer would have paid a willing seller, assuming neither was under pressure and both knew what the property could be used for. This measure compensates you as if the property were permanently gone, which is why conversion is sometimes described as a forced sale from you to the converter.
If you want the actual property back rather than its cash value, you can pursue a replevin action. Replevin is a court procedure that orders the return of specific personal property. It is especially valuable when the item has sentimental significance, is one of a kind, or can’t easily be replaced at market price. You generally pursue either replevin or damages, not both, since recovering the property and collecting its full value would be double recovery.
Punitive Damages
When the conversion was especially egregious, involving fraud, malice, or reckless disregard for your rights, some states allow punitive damages on top of compensatory damages. Punitive damages are meant to punish and deter, not to compensate you for a specific loss. Availability varies by state; some states cap punitive awards, and not all permit them in conversion cases. A straightforward conversion with no aggravating conduct almost never triggers them.
Attorney Fees
Under the American Rule, which most states follow, each side pays its own attorney fees regardless of who wins. Conversion cases are no exception. Unless a contract between the parties includes a fee-shifting clause, or a specific state statute authorizes fee recovery in your circumstances, expect to bear your own legal costs even if you prevail.
Defenses That Can Defeat the Claim
Several defenses can block a conversion claim. The most direct is consent. If you gave someone permission to use the property in the way they used it, there is no conversion. Consent has limits, though. Permission to borrow a camera for the weekend doesn’t authorize keeping it for six months, and permission to store inventory in a warehouse doesn’t authorize the warehouse to sell it.
Other recognized defenses include:
- Legal authority. A police officer who seizes evidence under a valid warrant, or a creditor who repossesses collateral under a valid security agreement, is acting within legal authority.
- Statute of limitations. Every state imposes a deadline for filing a conversion claim. These typically range from two to six years, with most falling in the two-to-three-year range. Miss the deadline and the claim is barred regardless of its merits.
- Abandonment. If the owner voluntarily gave up rights to the property, a later taking is not conversion. Leaving an item at the curb for trash pickup can qualify.
- Waiver or ratification. If the owner learned about the unauthorized use and accepted it, or accepted compensation for it, they may have waived the right to sue.
One thing missing from that list is worth flagging: good faith and reasonable care. Honestly believing you had the right to the property does not protect you.
Before You File
A conversion claim has to be worth the cost of litigation. Civil filing fees typically run a few hundred dollars, and attorney fees can quickly exceed the property’s value. If the converted property is worth less than your state’s small claims court limit, filing there without a lawyer is usually the more practical route.
Document everything before the dispute escalates. Proof of ownership, proof of the property’s value, and evidence of the defendant’s unauthorized control are the backbone of any conversion case. Receipts, photographs, title documents, text messages acknowledging possession, and written demands for return all strengthen your position. The written demand matters especially when the other person received the property lawfully, since the refusal to return it is often what establishes the conversion in the first place.