The Complete Flyer Size Guide: A4, A5, and B5 — How to Choose

When producing flyers for the first time, size selection is often the first roadblock. Even with the same design, the format you choose affects how well information comes across, how easy the piece is to distribute, and what you'll pay per unit. Here's a practical guide to the three most common sizes — A4, A5, and B5 — and when to use each.

Actual Dimensions of Standard Sizes

Flyers typically follow the ISO 216 international A-series standard or the B-series. Knowing the exact millimeter dimensions helps when submitting files to a print shop.

| Size | Dimensions (mm) | Reference | |------|-----------------|----------| | A4 | 210 × 297 | Standard copy paper size | | A5 | 148 × 210 | Exactly half of A4 | | B5 | 182 × 257 | Between A4 and A5 |

A5 is precisely A4 folded in half, and B5 is slightly larger than A5. Because two A5 sheets fit on the same press sheet as one A4, A5 typically costs less per unit.

Recommended Sizes by Use Case

A4 — When Content is Dense

A4 is the right choice for content-heavy pieces such as real estate listings, school curriculum sheets, or event programs that include tables and multiple text blocks. It's easy to read and posts well on bulletin boards.

A5 — Hand-Distribution Flyers

A5 is the most common size for street handouts, mailbox inserts, and counter displays. It's light and compact — easy for people to accept and slip into a bag.

B5 — Between A5 and A4

When A5 is too cramped and A4 feels oversized, B5 hits the sweet spot. Great for menus, simple catalogs, and seminar announcements.

How Size Affects Unit Cost

Print pricing is determined in part by how many sheets fit on a standard press sheet. Because two A5 pieces yield from the same area as one A4, paper cost per unit is roughly half for A5 at the same quantity. That said, squeezing content into a smaller size at the expense of readability is counterproductive — balance information density with cost.

Practical Checklist

• [ ] Decide on your distribution method first (handout / mailbox / posted)
• [ ] Review a proof to confirm all key content fits comfortably at the chosen size
• [ ] Include 3mm bleed on all sides in your artwork
• [ ] Settle on any folding (half-fold, tri-fold) before finalizing size

Frequently Asked Questions

Between A4 and A5, which performs better for distribution?

For street handouts, A5 tends to have a higher acceptance rate — people are less reluctant to take a smaller piece. If you need recipients to read through detailed information, A4 has an advantage.

Can I order a custom size that doesn't match a standard?

Yes, but custom sizes generate more trim waste and typically cost more than standard sizes. Stick with standard dimensions unless there's a specific design reason to go custom.