1.375:1 Aspect Ratio Calculator - Academy Ratio Dimensions Tool

Frequently Asked Questions about 1.375:1 Aspect Ratio

What is 1.375:1 aspect ratio?

The 1.375:1 aspect ratio (also called Academy ratio or 11:8) means the width is 1.375 times the height. That's 11 units wide for every 8 units tall.

The Academy of Motion Picture Arts and Sciences established this in 1932 as the theatrical standard. It dominated cinema until widescreen formats arrived in the 1950s.

The ratio was designed to fit optical soundtracks on film while keeping a good compositional frame. It's slightly wider than 4:3 TV (1.33:1).

Classic films shot in this ratio:

• Casablanca
• Citizen Kane
• Gone with the Wind
• The Wizard of Oz

Today's uses:

• Film restoration
• Archival projects
• Period filmmaking
• Vintage aesthetic projects

Is 1.375:1 the same as Academy ratio?

Yes, 1.375:1 is essentially the same as the Academy ratio. The official Academy ratio is 1.37:1, and 1.375:1 is a simplified version.

The Academy of Motion Picture Arts and Sciences standardised 1.37:1 in 1932 for sound films. It remained the industry standard until widescreen formats arrived in the 1950s.

The difference is tiny:

• Only 0.005 difference (0.4%)
• Less than 4 pixels at 1080p height
• Imperceptible to viewers

Why use 1.375:1 instead of 1.37:1?

• Produces exact integer pixel dimensions
• At 1080p: 1.375:1 gives exactly 1485 pixels width
• At 1080p: 1.37:1 gives 1479.6 pixels (needs rounding)
• Easier to work with in modern editing software

Historical note: The Academy ratio replaced the earlier 1.33:1 silent film ratio to make space for optical soundtracks on the film strip.

What does the 1.375 number actually mean?

The 1.375 number represents the mathematical relationship between width and height: width = height × 1.375

How to calculate:

• To find width: Multiply height by 1.375
• To find height: Divide width by 1.375

Examples:

• 1080 pixels height → 1080 × 1.375 = 1485 pixels width
• 2200 pixels width → 2200 ÷ 1.375 = 1600 pixels height

The 1.375 decimal comes from the fraction 11/8 (11 ÷ 8 = 1.375). This is why it's also called the 11:8 aspect ratio - for every 11 units of width, there are 8 units of height.

In cinema terms, 1.375:1 creates a slightly wider-than-square rectangle. It offered more horizontal space than 4:3 (1.33:1) whilst remaining relatively compact for film stock economy.

How is 1.375:1 different from 4:3 aspect ratio?

The 1.375:1 aspect ratio is slightly wider than 4:3, with approximately 3.4% more horizontal width for the same height.

At 1080p height:

• 1.375:1 = 1485×1080 pixels
• 4:3 = 1440×1080 pixels
• Difference = 45 pixels wider

Historical context:

• 1.375:1 (Academy ratio): Cinema standard from 1932-1950s for theatrical sound films. Designed to accommodate optical soundtracks on 35mm film.
• 4:3: Television standard from 1940s-2000s. Also the earlier silent film ratio.

Visual difference:

• 1.375:1 appears subtly wider and more cinematic
• 4:3 is slightly more square

Use cases today:

• 1.375:1: Film restoration, archival work, period-accurate cinematography
• 4:3: Vintage TV content, artistic projects, Instagram posts

Most viewers would barely notice the difference unless comparing side-by-side.

Is 1.375 the same as 11:8 ratio?

Yes, 1.375:1 and 11:8 are mathematically identical. They're just two different ways of expressing the same aspect ratio.

Quick verification: 11 ÷ 8 = 1.375

Two ways to express it:

• 11:8 - The simplified fractional form
• 1.375:1 - The decimal form

Both mean the width is 1.375 times the height, or 11 units wide for every 8 units tall.

Why both exist?

• 11:8 notation: Cleaner and easier to understand. Great for scaling. Immediately shows that for every 11 pixels of width, there are 8 pixels of height.
• 1.375:1 notation: Standard in cinema terminology. Easier to compare with other ratios like 16:9 (1.78:1) or 21:9 (2.33:1).

Example calculation at 1600px height:

• Using 11:8 → (1600 × 11) ÷ 8 = 2200 pixels wide
• Using 1.375:1 → 1600 × 1.375 = 2200 pixels wide
• Same result!

Industry usage: Cinema professionals often use 1.37:1 or 1.375:1, whilst videographers and editors might prefer 11:8 for its simplicity.

What is the difference between 1.37 and 1.375 aspect ratio?

The difference is extremely small - only 0.005, which is less than 0.4% difference in width. For practical digital video production, they're effectively identical.

At 1080p height (1080 pixels):

• 1.37:1 = 1479.6 pixels wide (rounded to 1480)
• 1.375:1 = 1485 pixels wide
• Difference = 5-6 pixels (imperceptible to the eye)

At 4K height (2160 pixels):

• 1.37:1 = 2959.2 pixels wide (rounded to 2960)
• 1.375:1 = 2970 pixels wide
• Difference = 10 pixels out of nearly 3000

Historical context:

• 1.37:1 - The official Academy aperture ratio standardised in 1932
• 1.375:1 (11:8) - A convenient digital approximation that produces exact integer pixel dimensions

Why 1.375 is preferred digitally:

• Produces clean integer dimensions (1485, 1980, 2970) at common heights
• Avoids rounding errors
• Simplifies calculations
• 1.37:1 requires rounding, which can cause precision issues in multi-generation editing

In practice: Film archivists might specify 1.37:1 for historical accuracy, whilst video editors and digital filmmakers typically use 1.375:1 for convenience. The visual difference is negligible.

How do I calculate 1.375 aspect ratio in pixels?

To calculate 1.375:1 (11:8) aspect ratio in pixels, use these formulas:

If you have the width:

• Height = Width ÷ 1.375
• Or: Height = (Width × 8) ÷ 11

If you have the height:

• Width = Height × 1.375
• Or: Width = (Height × 11) ÷ 8

Example 1: Starting with 2200 pixels width

• Height = 2200 ÷ 1.375 = 1600 pixels
• Result: 2200×1600
• Verification: 2200 ÷ 1600 = 1.375 ✓

Example 2: Starting with 1080 pixels height

• Width = 1080 × 1.375 = 1485 pixels
• Result: 1485×1080
• Verification: 1485 ÷ 1080 = 1.375 ✓

Common 1.375:1 resolutions:

• 1100×800
• 1485×1080 (HD height)
• 1650×1200
• 1980×1440 (QHD height)
• 2200×1600
• 2970×2160 (4K height)
• 2750×2000

Tip: Always round to the nearest even number for best compatibility with video codecs (most codecs require dimensions divisible by 2).

What are the pixel dimensions for 1.375 aspect ratio at 1080p?

For 1.375:1 aspect ratio at 1080p (1080 pixels height), the correct width is 1485 pixels, giving dimensions of 1485×1080.

Calculation:

• 1080 × 1.375 = 1485 pixels
• Verification: 1485 ÷ 1080 = 1.375 ✓
• Total pixels: 1,603,800 pixels (approximately 1.6 megapixels)

Comparison to other 1080p formats:

• 16:9 at 1080p: 1920×1080 (standard HD, wider)
• 4:3 at 1080p: 1440×1080 (narrower, more square)
• 1.375:1 at 1080p: 1485×1080 (Academy ratio, between 4:3 and 16:9)

This resolution has more pixels than HD 720p (921,600 pixels) but fewer than full HD 1080p 16:9 (2,073,600 pixels).

Use cases:

• Film restoration of 1930s-1950s Academy ratio movies
• Period-accurate filmmaking projects
• Archival video work maintaining historical aspect ratios
• Digital transfers of 16mm or 35mm Academy aperture film

Technical notes:

• Works well with modern video codecs (H.264, H.265)
• Both dimensions are divisible by common macroblock sizes
• File size: Approximately 78% of full 1920×1080 footage (due to 22.6% fewer pixels)

How do I convert 1920x1080 to 1.375 aspect ratio?

To convert 1920×1080 (16:9) to 1.375:1 aspect ratio, you have two options: pillarboxing or cropping.

Option 1: Pillarbox (add vertical black bars)

• Keep height at 1080 pixels
• Calculate new width: 1080 × 1.375 = 1485 pixels
• Add black bars on left and right: (1920 - 1485) ÷ 2 = 217.5 pixels on each side
• Result: 1485×1080 content centered in 1920×1080 frame with 218-pixel black bars
• No content is lost - the entire 16:9 frame is visible with sidebars

Option 2: Crop (remove content from sides)

• Scale 1920×1080 to fit 1485×1080
• Crops 435 pixels (22.7%) from the sides
• New dimensions: 1485×1080 with left/right cropping
• Subject positioning matters - ensure important content isn't cut off

Recommended workflow in editing software:

1. Import 1920×1080 footage into a 1485×1080 sequence (Academy ratio timeline)
2. The software will automatically add pillarboxing
3. Or: Scale footage to fill the Academy frame, accepting some cropping
4. Use position controls to ensure subjects remain in frame

Which to choose:

• Pillarboxing: Preserves all content. Best for archival or when you can't lose any frame information.
• Cropping: Creates a more immersive Academy look without black bars, but loses content from the frame edges.

What is the width and height of a 1.375 aspect ratio image?

The width and height of a 1.375:1 aspect ratio image depends on your desired resolution. The relationship is always: Width = Height × 1.375 (or Height × 11/8).

Entry-level/web:

• 825×600 (small web images)
• 1100×800 (standard Academy)
• 1375×1000 (medium resolution)

HD formats:

• 1485×1080 (Academy at HD height - most common for video)
• 1650×1200 (higher quality stills)

QHD/2K formats:

• 1980×1440 (Academy at QHD height)
• 2200×1600 (high-resolution stills)

4K/UHD formats:

• 2970×2160 (Academy at 4K height)
• 2750×2000 (ultra high-resolution stills)
• 3300×2400 (premium large-format)

Print dimensions at 300 DPI:

• 1375×1000 = 4.58" × 3.33" print
• 2200×1600 = 7.33" × 5.33" print
• 2750×2000 = 9.17" × 6.67" print

How to choose dimensions:

• For video: Match your project height (1080p, 1440p, 2160p) and calculate width using Height × 1.375
• For photos: Consider your output medium - web, print, or archival. Higher resolution = more detail but larger file sizes
• For film scanning: Match your source material quality and intended distribution format

General guidance: Start with the height you need (based on display device or project settings), then multiply by 1.375 to get the width. Always round to even numbers for video codec compatibility.

Industry standards: For professional cinema work, use 2970×2160 (4K Academy) or 1485×1080 (HD Academy).