5x7

With dimensions of 5 inches wide by 7 inches tall, the 5x7 index card provides 35 square inches of writing space. Sometimes referred to as the jumbo jumbo card, this larger index card offers even more room for notes, study aids, recipes, and reminders than smaller 3x5 and 4x6 sizes. The sizable surface area enables lengthy writing on a single card. While the 5x7 size may be less portable than 3x5 or 4x6, its expanded capacity can be ideal for detailed flashcards, extensive formulas, lengthier recipes, and subject matter requiring ample space. The origins of the 5x7 card trace back to the late 19th century library card catalogs where librarians took advantage of its spacious size for thorough cataloging. Today, students, teachers, cooks, writers, and others benefit from the 5x7 when portability isn't as important as sheer writing real estate. It fills the need when standard 3x5 and 4x6 cards just aren't big enough.