Direct-mail glossary
Postcard sizes (4×6, 6×9, 6×11)
The three most common marketing postcard sizes are 4×6 inches, 6×9 inches, and 6×11 inches. Each has different USPS rate classes, print costs, and visual impact in the mailbox.
Why it matters
A 4×6 postcard meets USPS dimensional standards for the postcard rate, making it the least expensive to mail — ideal for recalls, reminders, and frequent touchpoints. The 6×9 is the most popular upgrade: it offers nearly twice the design canvas and stands out more in a mail stack. The 6×11 is the largest standard format, making a bold statement for grand openings, premium offers, and high-value campaigns. When choosing a size, weigh the incremental cost against the campaign goal: a quick recall may need only a 4×6, while a new-patient acquisition campaign might justify the larger real estate of a 6×9 or 6×11.
CardCadence
How CardCadence handles it
CardCadence supports all three sizes. Pricing is per piece and all-in (print, postage, and mailing included): $0.75 for 4×6, $0.80 for 6×9, and $1.13 for 6×11. There is no minimum order and no subscription — you pay only for the cards you actually mail. Templates are available for each size in the Card Designer, and you can order a free printed sample of any size before funding a full campaign run.
Ready to put this into practice?
CardCadence handles the printing, postage, and mailing from $0.75 per postcard — no subscription required.