USPS Cheat Sheet

First-Class Mail
Letters AND Postcards
Automation
Weight Not Over (ounces)	5-Digit	3-Digit	Mixed
1	0.621	0.672	0.707
2	0.621	0.672	0.707
3	0.621	0.672	0.707
3.5	0.621	0.672	0.707
Postcard	0.453	0.478	0.495

USPS Marketing Mail Letters
Commercial
3.5 OZ or less	Carrier Route			Automation
Entry Point	Saturation	High Density +	High Density	5-Digit	3-Digit	Mixed
None	0.255	0.286	0.389	0.395	0.435	0.467
DSCF	0.234	0.265	0.368	0.374	0.414	—
DDU	—	—	—	—	—	—

USPS Marketing Mail Letters
Non-Profit
3.5 OZ or less	Carrier Route			Automation
Entry Point	Saturation	High Density +	High Density	5-Digit	3-Digit	Mixed
None	0.160	0.178	0.181	0.185	0.225	0.257
DSCF	0.139	0.157	0.160	0.164	0.204	—
DDU	—	—	—	—	—	—

USPS Marketing Mail Flats
Commercial
Flats weighing 4.0 oz or less	Carrier Route					Automation
Entry Point	Saturation	EDDM	High Density +	High Density	Basic	5-Digit	3-Digit	Mixed
None	0.308	0.309	0.373	0.404	0.504	0.783	1.021	1.260
DSCF	0.267	0.268	0.332	0.404	0.504	0.742	0.980	—
DDU	0.258	0.259	0.323	0.354	0.454	—	—	—

USPS Marketing Mail Flats
Non-Profit
Flats weighing 4.0 oz or less	Carrier Route					Automation
Entry Point	Saturation	EDDM	High Density +	High Density	Basic	5-Digit	3-Digit	Mixed
None	0.186	0.187	0.227	0.324	0.424	0.516	0.754	0.993
DSCF	0.145	0.146	0.186	0.283	0.383	0.475	0.713	—
DDU	0.136	0.137	0.177	0.274	0.374	—	—	—

Revised 2026-07-09