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Standard-sized Envelope

When it comes to choosing envelopes for everyday use or business purposes, selecting a standard size is a convenient and cost-effective option. It can cater to a wide range of applications perfectly. "Thai Envelope" a leading manufacturer and distributor of high-quality envelopes, offers a variety of standard-sized envelopes to meet the diverse needs of our customers. Whether it's for sending business documents, invitations, or general correspondence, this article will guide you through the standard-sized envelopes we offer, along with their features and benefits of choosing these envelopes."

Comparison table of envelope and paper sizes for optimal usability.

ชื่อสินค้า	Size	เหมาะสำหรับ	ขนาดกระดาษ
DL	110 x 220 mm.	Tri-fold A4 paper	210 x 99 mm.
C6	115 x 162 mm.	A6 paper	105 x 148 mm.
C5	162 x 229 mm.	A5 paper	148 x 210 mm.
C4	229 x 324 mm.	A4 paper	210 x 297 mm.
C3	324 x 457 mm.	A3 paper	297 x 420 mm.
4.1/4 x 9.1/8	108 x 232 mm.	A6 paper	105 x 148 mm.
5 x 8	127 x 203 mm.	B6 paper	125 x 176 mm.
5 x 10	127 x 254 mm.	B6 paper	125 x 176 mm.
6 x 9	153 x 229 mm.	A5 paper	148 x 210 mm.
6 x 12	153 x 305 mm.	A5 paper	148 x 210 mm.
7 x 10	178 x 254 mm.	B5 paper	176 x 250 mm.
7.1/2 x 10.1/2	191 x 267 mm.	B5 paper	176 x 250 mm.
8 x 11	203 x 280 mm.	B5 paper	176 x 250 mm.
9 x 12	229 x 305 mm.	A4 paper	210 x 297 mm.
10 x 12	254 x 305 mm.	A4 paper	210 x 297 mm.
10 x 13	254 x 330 mm.	A4 paper	210 x 297 mm.
10 x 14	254 x 356 mm.	B4 paper	250 x 353 mm.
10 x 15	254 x 381 mm.	B4 paper	250 x 353 mm.
11 x 16	280 x 407 mm.	B4 paper	250 x 353 mm.
12 x 16	305 x 407 mm.	B4 paper	250 x 353 mm.
12 x 17	305 x 432 mm.	A3 paper	297 x 420 mm.
15 x 19	381 x 483 mm.	X-ray film	356 x 432 mm.

Popular Standard Envelope Sizes

C3 Brown Envelope

An envelope that perfectly fits A3-sized paper is called a C3 envelope, which has dimensions of 324x457 mm. It is slightly larger than the standard unfolded A3 paper, which has dimensions of 297x420 mm.

C4 Brown Envelope

An envelope that can hold an unfolded standard A4 paper is called a C4 envelope, which has dimensions of 229x324 mm. It is slightly larger than standard unfolded A4 paper, which is 210x297 mm, allowing it to perfectly fit an A4 sheet.

C5 Brown Envelope

A C5 envelope is designed to hold an A4 paper folded in half or an A5 size paper. The C5 envelope measures 162x229 mm, perfectly fitting standard A5 paper sized 148x210 mm.

C6 Brown Envelope

The C6 envelope (115x162 mm) is designed for quarter-folded A4 or half-folded A5 paper, slightly larger than A6 size (105x148 mm), perfectly fit for A6 sheets.

DL Brown Envelope

The DL envelope (110x220 mm) is slightly larger than tri-fold A4 (210x99 mm), perfectly fitting a tri-fold A4 sheet and also called a business reply envelope.