Our US flag calculator allows you to calculate the size & proportions of the American flag - probably the best known banner worldwide.

The US flag dimension calculator is a simple tool that calculates for you the length of all the US flag elements based on one measurement.

Would you like to find out more about the American flag dimensions, history, and the standard US flag sizes? Read on to fully discover the most beloved symbol of America US flag emoji

History of the American flag - American flag layout

US flag has over 245 years of history. Our flag size calculator presents only one of 44 designs that the official American banner has had over these years.

  • It all started in December 1775, with the very first pattern that incorporated a Union Jack (uk flag emoji ) into a field full of white and red stripes.

  • The second design in 1777 brought a very anticipated change - a union full of stars each representing a US states (there were only 13 of them at the time!). This US flag design consisted of 13 red & white stripes and the same number of stars.

  • Each flag that followed didn't last long - the US was continually expanding, and new states (and stars!⭐) were constantly being added.

💡 Americans always introduced new flags on the 4th of July!

  • The current flag was created in 1960 after the addition of Hawaii, the only island state located outside of North America. That was when the 50th star was finally placed in the union, creating the everlasting image we know today (which has specified American flag proportions).

Want to know more about the United States of America? Apart from the flag calculator, we have a few other tools:

Measurements of the American flag - dimensions ratio and the flag calculator

Our American flag calculator uses the American flag proportions presented in Title 4 of the United States Code, § 1 and § 2. These American flag measurements ratios are:

  • (A) Height (hoist) of the flag = 1.0;
  • (B) Width (fly) of the flag = 1.9;
  • (C) Union height (Hoist of the canton) = 0.5385 (A × 7/13, spanning seven stripes);
  • (D) Union width (Fly of the canton) = 0.76 (2/5 of the flag width);
  • (E) Distance between union stars - vertical = 0.0538 (1/10 of the height of the union);
  • (F) Distance between union stars - horizontal = 0.0633 (1/12 of the width of the union);
  • (G) Diameter of star = 0.0616 (4/5 of the stripe width); and
  • (H) Width of stripe = 0.0769 (1/13 of the flag height).
💡 American flag layout should use the following colors in hex code :
Blue #3C3B6E
Red #B22234

The American flag layout calculator uses these American flag size ratios to compute the properties of a flag of a chosen height/width. If you already know these ratios and are just looking for the missing terms, you can use our ratios calculator, too!

How did we calculate that?

You have to multiply each of these ratios by a coefficient, x. You can manually set the x value by clicking the advanced mode button at the bottom of our American flag dimensions calculator.

Standard American flag sizes - American flag measurements

The typical size of a home flag is 3 x 5 ft (91.44 x 152.4 cm). Casket (burial) flags are bigger: 5 ft x 9 ft 6 in (152.4 x 289.56 cm).

Thanks to the American flag size ratio calculator, you can compute all the values needed to create an official US flag of any size, for both private and public use.

Don't hesitate to discover other American US flag emoji for the us sizes standards:


What is the aspect ratio of American flag?

The height to width ratio of the American flag is 10:19.

When was the current American flag adopted?

The current American flag was adopted on July 4, 1960, after the inclusion of Hawaii.

How many stars and stripes does the American flag have?

The American flag has thirteen horizontal stripes alternating in red and white colors. It also has 50 white stars on the top left corner, arranged in alternating rows of 6 and 5 stars. Each star represents the state of the United States of America.

What size are the stars and stripes on the American flag?

The stars must have a diameter of approximately 4/5th of a stripe whereas each stripe itself must be 1/13 of the total height of the flag.

What do the stripes on the American flag denote?

The 13 stripes on the American flag represent the original 13 colonies that declared independence from British rule. They were the first 13 states of the United States of America.

Łucja Zaborowska, MD, PhD candidate
the US flag and it's proportions
Width (A)
Length (B)
Union width (C)
Union length (D)
Star gaps - width (E)
Star gaps - length (F)
Stars diameter (G)
Stripes width (H)
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