The flag of Anguilla consists of a blue background with the British flag in the upper left corner and the Anguillan coat of arms centered on the right side. The coat of arms features three dolphins leaping over the sea, with a sunset in the background and the inscription "Unity, Strength, Endurance" below.

The aspect ratio of the flag is 1:2, meaning that it measures twice as long as it does wide. The geometric properties of the flag are rectangular, with a width of 900 pixels and a height of 1800 pixels.

The color codes used in the flag are:

• Blue: Pantone 300C (RGB: 0, 50, 148)
• Red: Pantone 186C (RGB: 213, 43, 30)
• White: (RGB: 255, 255, 255)

The proportions of the Union Jack in the upper left corner follow the standard of 1:2:1 for the respective heights of the red cross, white border, and red cross.

Overall, the flag of Anguilla has a simple and distinctive design, reflecting the island's ties to both Britain and the Caribbean region.