The standard index card measures 3×5 inches (76×127 mm), about the size of your palm. This compact dimension makes it perfect for quick notes and portable information storage.

Jul 3, 2025 · Index cards might seem like a small detail, but they pack a punch in productivity, organization, and creative work. Whether you’re going traditional with 3x5s or experimenting …

Check out our chart that compares index card sizes in inches, centimeters, and millimeters.

The most common size for index card in North America and the UK is 3 by 5 inches (76.2 by 127.0 mm), hence the common name 3-by-5 card.

Aside from 3 x 5, the index card is available in the following sizes: 4 x 6 inches (101.6 x 152.4 mm), 5 x 8 inches (127.0 x 203.2 mm) and ISO-size A7 (74 x 105 mm/2.9 x 4.1 in).

Jan 18, 2022 · In this article we review for you all the different index card sizes available (at the time of writing in 2023), the best use-case for each size, and the pros and cons of different sizes.

Jun 16, 2024 · Dive into the captivating world of stationery as we delineate the dimensions of an index card in this detailed comparison guide.

Learn everything you need to know about index card sizes with this helpful guide. From smallest to largest, here are all the cards you’re looking for.

Dec 25, 2024 · Using a 1/4 index card (approximately 2.5 x 3.7 inches or 6.4 x 9.4 cm) can be a good compromise between the traditional index card size and the more compact sizes like …

Jun 11, 2025 · 3x5 inches (76.2 x 127 mm): This is one of the most widely used index card sizes, ideal for general note-taking, studying, and outlining. 4x6 inches (101.6 x 152.4 mm): This size …