The flag of Sint Maarten consists of a blue, white, and red background divided diagonally from the lower hoist side to the upper fly side. The blue section represents the sky and sea, while the white stands for peace and unity. The red symbolizes courage, vitality, and the friendliness of the people.

The flag has an aspect ratio of 2:3 (height to width). The diagonal line dividing the flag starts at the bottom left corner and finishes at the upper right corner, with a slope of approximately 63 degrees.

The geometric properties of the flag are that it is a rectangular shape with two congruent triangles on either side of the diagonal line. The blue triangle on the hoist side measures approximately 1/4 of the width of the flag, while the red triangle on the fly side measures about 3/4 of the width of the flag.

The official color codes for the flag of Sint Maarten are as follows:

• Blue: Pantone 279 C; RGB: 0, 56, 168; CMYK: 100, 67, 0, 34
• White: N/A
• Red: Pantone 186 C; RGB: 206, 17, 38; CMYK: 0, 100, 91, 19