Size comparison
A5 vs A6
A5 (148 × 210 mm) is exactly twice the area of A6 (105 × 148 mm). In practice this is the flyer-versus-postcard decision: A5 carries a message with supporting text, A6 carries a single visual punch at half the print cost.
Both sheets drawn to the same scale. The dashed line is the A5 half-fold that produces A6.
Side-by-side dimensions
| Property | A5 | A6 |
|---|---|---|
| Millimetres | 148 × 210 | 105 × 148 |
| Centimetres | 14.8 × 21.0 | 10.5 × 14.8 |
| Inches | 5.83 × 8.27 | 4.13 × 5.83 |
| Pixels @ 300 DPI | 1748 × 2480 | 1240 × 1748 |
| Area | 310.8 cm² | 155.4 cm² |
| Per A4 sheet | 2 | 4 |
| Flat envelope | C5 (229 × 162) | C6 (162 × 114) |
| Reference page | Full A5 guide | Full A6 guide |
Choose A5 when…
- The flyer needs body text: event details, menus, T&Cs
- It becomes a booklet, programme or zine (folds from A4)
- Notepads and journals — comfortable writing space
- Direct mail that must stand out in a letterbox stack
Choose A6 when…
- Postcards — the international standard size
- One image, one line: promo cards, save-the-dates
- Budget is tight — four per A4 sheet, half the A5 cost
- Handouts people pocket rather than fold
Frequently asked questions
Which is bigger, A5 or A6?
A5 is bigger. A5 measures 148 × 210 mm; A6 measures 105 × 148 mm. A5 has exactly twice the area of A6 — folding an A5 sheet in half produces an A6.
Is A6 half of A5?
Yes, exactly. The short edge of A5 (148 mm) becomes the long edge of A6. This is the same halving rule that connects every adjacent pair in the ISO 216 A-series.
Should my flyer be A5 or A6?
A5 when the message needs any body text at all — event details, menus, offers with terms. A6 when the message is a single visual with one line: promo cards, save-the-dates, product cards. A6 costs half as much per unit but forces radical brevity.
Is A6 the postcard size?
Yes — A6 (105 × 148 mm) is the international standard postcard. A5 postcards exist but cost more to mail in many countries because they exceed standard letter dimensions when thick card is used.
What envelopes fit A5 and A6?
A6 fits flat in a C6 envelope (162 × 114 mm). A5 fits flat in a C5 envelope (229 × 162 mm), or folded once into a C6. A greeting card that folds from A5 to an A6 face pairs with a C6 envelope.
How many of each fit on an A4 sheet?
Two A5 sheets per A4, or four A6 sheets per A4 — both with zero waste. This is why A6 is the cheapest possible promo-card format on standard print equipment.