The official U.S. flag has a 1:1.9 aspect ratio, while most residential flags use a 3:5 ratio. Standard flag sizes range from 2 × 3 ft to 30 × 60 ft, with 3 × 5 ft being the most common size for homes.
This guide covers the official flag dimension ratio, a full size chart, pole-matching rules, and the mistakes most buyers never see coming — until their flag is already drooping on the wrong pole.
What Are Standard Flag Dimensions?
American flag dimensions
The official American flag dimension ratio is 1:1.9. This means for every 1 unit of height (called the hoist), the flag’s length (called the fly) is 1.9 units.
- Hoist is the vertical edge — the side attached to the pole.
- Fly is the horizontal edge — the length that stretches out in the wind.
When a chart lists “3×5,” the first number is the hoist and the second is the fly.
Flag Dimensions Size Chart (Feet, Inches & Centimeters)
Common Flag Dimensions Chart (2×3 to 30×60)
| Flag Size | Common Use |
|---|---|
| 2′ × 3′ | Balconies, tight spaces |
| 3′ × 5′ | Most homes and small businesses |
| 4′ × 6′ | Larger homes, small commercial poles |
| 5′ × 8′ | Schools, hospitals, municipal buildings |
| 6′ × 10′ | Mid-size commercial sites |
| 8′ × 12′ | Large commercial or school grounds |
| 10′ × 15′ | High-visibility commercial sites |
| 12′ × 18′ | Large civic or commercial displays |
| 20′ × 30′ | Stadiums, large campuses |
| 30′ × 60′ | Landmark and monumental displays |
Union (Canton) and Stripe Dimensions for Each Standard Size
The union — the blue field with stars — always covers the same fraction of the flag, no matter the size. Its height equals seven-thirteenths of the flag’s total height. Its width spans 40% of the flag’s total length.
Each stripe is equal in width, taking up one-thirteenth of the flag’s total height. So on a 3×5 flag, each stripe is roughly 2.3 inches tall. On a 20×30 flag, that same stripe grows to nearly 15 inches — same proportion, much bigger canvas.
Flag Dimensions
| Feet | Inches | Centimeters |
|---|---|---|
| 2′ × 3′ | 24″ × 36″ | ~61 × 91 cm |
| 3′ × 5′ | 36″ × 60″ | ~91 × 152 cm |
| 4′ × 6′ | 48″ × 72″ | ~122 × 183 cm |
| 5′ × 8′ | 60″ × 96″ | ~152 × 244 cm |
How to Match Flag Dimensions to Your Flagpole
The ¼ to ⅓ Rule for Flag-to-Pole Dimensions
Flag professionals rely on one rule: the flag’s length should equal about one-quarter to one-third of the flagpole’s height.
A flag any smaller looks lost. Any bigger, and it drags, tangles, or brushes the ground — a direct violation of the U.S. Flag Code, which states a flag should never touch the ground.
Flag Dimensions by Flagpole Height
| Flagpole Height | Recommended Flag Size |
|---|---|
| 15′–20′ | 3′ × 5′ |
| 20′–25′ | 4′ × 6′ |
| 25′–30′ | 5′ × 8′ |
| 30′–35′ | 6′ × 10′ |
| 40′–45′ | 8′ × 12′ |
| 50′ | 10′ × 15′ |
| 60′–70′ | 12′ × 18′ |
| 100′+ | 20′ × 30′ or larger |
Indoor Flag Dimensions vs. Outdoor Flag Dimensions
A 3×5 indoor flag typically pairs with a 7 to 8-foot presentation pole in an office or auditorium. A 4×6 indoor flag suits a 9-foot pole. These flags use lighter fabrics like nylon or cotton, often finished with a pole sleeve and gold fringe for ceremonial settings.
Outdoor flags, by contrast, need heavier, weather-rated material because wind and sun put far more stress on the fabric.
Specialty and Historical Flag Dimensions
Memorial and Casket Flag Dimensions (5′ × 9.5′)
A military burial flag is one exact size: 5 feet by 9.5 feet. This size is built to properly drape a standard casket. It’s presented folded, in a tight triangle, to the family of a fallen service member — and it’s never flown on a pole.
Betsy Ross and Other Historical Flag Dimensions
The Betsy Ross flag, with its 13 stars in a circle, is usually sold in the same standard sizes as a modern American flag — 3×5, 4×6, and so on — since its design predates the 1959 ratio standard. The same applies to other historical versions, like the 15-star Star-Spangled Banner flag flown at Fort McHenry.
Handheld and Stick Flag Dimensions
Small stick flags used in parades, classrooms, and memorial displays come in a few common sizes:
- 4″ × 6″ — desks, giveaways
- 8″ × 12″ — school events
- 12″ × 18″ — grave markers, memorial lines
These miniature versions still follow the same 1:1.9 or 3:5 proportion — small in scale, but accurate in shape.
Flag Dimensions FAQs
What are the standard flag dimensions for a house?
The standard house flag size is 3 feet by 5 feet. It fits most 15 to 20-foot residential flagpoles and wall-mounted brackets.
What is the official ratio for American flag dimensions?
The official ratio is 1:1.9, set by Executive Order 10834 in 1959. Most home flags use a slightly more compact 3:5 ratio instead.
What size flag do I need for a 20-foot flagpole?
A 3×5 or 4×6 flag works well on a 20-foot pole, following the ¼ to ⅓ sizing rule.
What are the dimensions of a memorial or casket flag?
A memorial flag measures 5 feet by 9.5 feet, sized specifically to drape a standard casket during a military funeral.
What are flag dimensions in inches and centimeters?
A standard 3×5 foot flag equals 36 by 60 inches, or about 91 by 152 centimeters.
Do indoor flag dimensions differ from outdoor flag dimensions?
Yes. Indoor flags typically pair 3×5 or 4×6 sizes with shorter 7 to 9-foot presentation poles, while outdoor flags use taller poles and heavier, weather-rated fabric.
What happens if my flag dimensions are too large for my pole?
An oversized flag can drag on the ground, strain the halyard, and wear out faster. It also breaks Flag Code guidance, which says a flag should never touch the ground.
What are the dimensions of the union (blue field) on a standard flag?
The union’s height equals seven-thirteenths of the flag’s total height, and its width covers 40% of the flag’s total length — the same ratio on every properly proportioned flag, regardless of size.
James Walker is a content researcher and writer specializing in dimensions, measurements, size comparisons, and conversion topics. He creates clear, practical, and easy-to-understand guides that help readers visualize and understand real-world measurements.