The flag of Samoa consists of a red field with a blue rectangle in the upper hoist-side quadrant, which bears five white stars. The dimensions of the flag are in a ratio of 1:2, meaning that the length is twice the width. The blue rectangle has a height-to-width ratio of 3:5 and is located at the mast side of the flag. The stars are arranged in the shape of the Southern Cross constellation and have different sizes, with the largest star in the center. The color codes used for the flag are:

• Red: Pantone 186 C / RGB 204, 0, 51 / #CC0033
• Blue: Pantone 286 C / RGB 0, 51, 153 / #003399
• White: RGB 255, 255, 255 / #FFFFFF

The geometric properties and measurements of the flag are as follows:

• Total area: 2 square meters (23 sq ft)
• Length: 4 meters (13 ft)
• Width: 2 meters (6.5 ft)
• Blue rectangle height: 0.6 meters (2 ft)
• Blue rectangle width: 1 meter (3.3 ft)
• Largest star diameter: 0.2 meters (8 inches)

The flag of Samoa was adopted on January 24, 1949, and it represents the country's independence and its place in the South Pacific region.