Priority mail envelope dimensions
The dimensions for Priority Mail envelopes vary depending on the size and type of envelope you need. Here are the standard dimensions for Priority Mail envelopes:
Small Flat Rate Envelope:
- Length: 6 1/8 inches (15.5 cm)
- Width: 3 1/2 inches (8.9 cm)
- Thickness: 0.25 inches (6.4 mm)
- Weight: 3.5 oz (99 g)
Medium Flat Rate Envelope:
- Length: 9 1/2 inches (24.1 cm)
- Width: 5 1/2 inches (14 cm)
- Thickness: 0.25 inches (6.4 mm)
- Weight: 6 oz (170 g)
Large Flat Rate Envelope:
- Length: 12 inches (30.5 cm)
- Width: 9 inches (22.9 cm)
- Thickness: 0.25 inches (6.4 mm)
- Weight: 13 oz (368 g)
Regional Rate Box A:
- Length: 5 inches (12.7 cm)
- Width: 8 1/2 inches (21.6 cm)
- Height: 3 1/2 inches (8.9 cm)
- Weight: 1 lb (453 g)
Regional Rate Box B:
- Length: 11 inches (27.9 cm)
- Width: 13 1/2 inches (34.3 cm)
- Height: 2 1/2 inches (6.4 cm)
- Weight: 2 lbs (907 g)
Priority Mail Express Envelope:
- Length: 12 inches (30.5 cm)
- Width: 9 inches (22.9 cm)
- Thickness: 0.25 inches (6.4 mm)
- Weight: 1 lb (453 g)
Please note that these dimensions are subject to change, and you should always check with the USPS website or a local post office for the most up-to-date information.