First-Class Mail is a fast, low-cost way to send envelopes and postcards. See First-Class Mail and Forever stamp prices for letters and postcards.

Quick Reference: Popular Envelope Size Comparison Finding the right envelope size doesn't have to be complicated. Here's a quick comparison of the most commonly used envelope sizes across different …

When planning mailing letters, it helps to have a quick-glance chart of the most common envelope sizes and USPS classifications. Below is a guide to standard envelope sizes, large envelopes, and …

This guide provides comprehensive envelope size charts with standard envelope dimensions, measurements, and specifications to help you select the right option for your documents and mailings.

Listed below is a wide range of standard sizes for a variety of different envelope types and styles. Click any of the envelope styles below to jump to their standard sizes:

Jul 2, 2025 · Different envelope sizes serve unique purposes. Legal-size envelopes at 9 x 14 inches (22.86 x 35.56 cm) hold legal documents without folding. A2 envelopes (4 3/8 x 5 3/4 inches) work …

Mar 18, 2024 · At The Paper Mill Store, we carry over 2,700 types of envelopes in dozens of different sizes and styles! That’s why we’ve created this envelope size guide. With our definitive guide, you …

Although there are different standard envelope sizes in Regular Envelopes, they all have some common characteristics. The following are some of the crucial attributes of a Regular Envelope. There are …

Use this guide to compare envelope sizes —from standard business envelopes to specialty types —and find the best fit for your letters, invoices, or marketing materials. Regular envelopes area staple for …

At least 3-1/2 inches high x 5 inches long x 0.007 inch thick. No more than 6-1/8 inches high x 11-1/2 inches long x 1/4 inch thick. First-Class Mail letters that have one or more nonmachinable …