Index Card Sizes: Standard Dimensions & Uses
The most common index card sizes are 3 × 5, 4 × 6, and 5 × 8 inches. This guide covers standard, fractional, and international index card dimensions.
Learn every popular index card size, including 3×5, 4×6, 5×8, A7, and fractional sizes like 1/2 and 1/4 index cards.
📇 Standard Index Card Sizes
| Size | Dimensions | Best For |
|---|---|---|
| 3 × 5 | 76 × 127 mm | Flashcards & quick notes |
| 4 × 6 | 102 × 152 mm | Recipes & speeches |
| 5 × 8 | 127 × 203 mm | Planning & outlines |
| A7 | 74 × 105 mm (2.9 × 4.1 in) | European equivalent |
📚 3×5, 4×6 & 5×8 Index Cards
3 × 5
Most common size for flashcards and study notes.
4 × 6
Perfect for recipes, speeches, and instructions.
5 × 8
Best for outlines, planning, and detailed notes.
✂️ Fractional Index Card Sizes
| Type | Typical Size | Notes |
|---|---|---|
| 1/2 Index Card | About 4 × 5 in | Half of a 5×8 card |
| 1/4 Index Card | Often 3 × 5 in | Varies by manufacturer |
| 1/8 Index Card | Brand dependent | Always check measurements |
🌍 Index Card vs A7
The closest international alternative is A7 (74 × 105mm). It’s slightly smaller than a US 3×5 index card, so it may not fit standard US card boxes perfectly.
🖨️ Printing & DIY Tips
Make Your Own
Cut cardstock to exactly 3 × 5 inches and round the corners if desired.
Printing
An 8.5 × 11-inch sheet typically fits 6 standard 3×5 cards.
Best Material
Use 90lb or heavier cardstock for durability.
❓ Frequently Asked Questions
Is an index card 3×5?
Usually, yes. The standard index card is 3 × 5 inches.
How many 3×5 cards fit on an 8.5×11 sheet?
A standard letter-size sheet fits approximately 6 cards.
Are index cards 3×5 or 4×6?
Both are standard sizes. 3×5 is best for short notes, while 4×6 provides more writing space.
Is a 3×5 index card considered 1/4 size?
Sometimes. Some manufacturers describe it as a quarter of a 5×8 card.
How do I measure a 3×5 index card?
Measure the short side first (3 inches), then the long side (5 inches).
How big is a 5×7 index card?
5×7 is not a standard index card size. The closest standard option is 5 × 8 inches.
How do I make a 3×5 index card?
Cut cardstock to exactly 3 × 5 inches and optionally round the corners.
Is a 1/2 index card 5×8?
No. A half-size card cut from a 5×8 sheet is typically about 4 × 5 inches.
How long is a 3×5 card?
The long edge measures exactly 5 inches, while the short edge measures 3 inches.
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