Book Mailer Shipping Size Helper

Preset package size for DIM weight across carriers.

Formula

DIM = ceil((L×W×H) ÷ divisor). Billable = max(DIM, actual). Preset: 12×9×3 in.

Worked example

Preset book-mailer at 2 lb — compare USPS (÷166) vs UPS/FedEx (÷139).

USPS DIM · UPS DIM · FedEx DIM

Source & last checked

Carrier DIM pages (USPS, UPS, FedEx)

Last checked: 2026-09-25

FAQ
Postage quote?

No — billable weight only.

Alcohol packaging?

No alcohol presets on this site.

Exact divisor?

Confirm on carrier pages.

Related tools
Embed this tool