Letter size guide royal mail

Here is a letter size guide for Royal Mail in the UK:

Standard Letter Sizes

• Small letter: Up to 76mm x 102mm (3" x 4")
• Medium letter: 76mm x 102mm to 114mm x 152mm (3" x 4" to 4.5" x 6")
• Large letter: 114mm x 152mm to 114mm x 202mm (4.5" x 6" to 4.5" x 8")

Large Letter Sizes (with extra charge)

• Large letter: 114mm x 202mm to 114mm x 254mm (4.5" x 8" to 4.5" x 10")
• Extra large letter: 114mm x 254mm to 114mm x 305mm (4.5" x 10" to 4.5" x 12")

Special Large Letter Sizes (with extra charge)

• Extra large letter: 114mm x 305mm to 114mm x 356mm (4.5" x 12" to 4.5" x 14")
• Extra extra large letter: 114mm x 356mm to 114mm x 406mm (4.5" x 14" to 4.5" x 16")

Important Notes

• The maximum weight for a standard letter is 100g.
• The maximum weight for a large letter is 750g.
• The maximum weight for a special large letter is 1kg.
• If your letter exceeds these sizes or weights, you may need to use a parcel service instead of a letter service.
• Royal Mail may refuse to accept a letter that is too large or too heavy for their services.

Please note that these sizes and weights are subject to change, so it's always best to check with Royal Mail for the most up-to-date information.