The term 'trade-in value calculator' refers to an ASSESSOR, which is an 8 letter word. An ASSESSOR is a professional who evaluates the worth of an item or property. They are often used in the context of real estate, insurance, and other financial transactions. A trade-in value calculator is a tool used to determine the value of a trade-in item, such as a car or other vehicle. It takes into account factors such as the age, condition, and market value of the item in order to calculate its worth.