Image Aspect Ratio Calculator
Calculate the exact aspect ratio of any image from its pixel dimensions, or find the perfect resize dimensions that maintain the original ratio. Prevent distortion, optimize for social media platforms, and ensure your images display flawlessly across every screen and print format.
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What is Image Aspect Ratio?
The image aspect ratio is the proportional relationship between an image's width and height, expressed as a simplified ratio like 3:2, 4:3, or 16:9. A 4000×3000 pixel photograph has a 4:3 aspect ratio — for every 4 units of width, there are 3 units of height. Maintaining this ratio during resizing ensures the image is never stretched, squeezed, or distorted.
Different use cases demand different aspect ratios: social media profiles (1:1 square), Instagram posts (4:5 portrait), YouTube thumbnails (16:9 landscape), Pinterest pins (2:3 tall), print photos (3:2, 5:7, 4:5), and website banners (custom wide ratios). This calculator determines your image's ratio and computes the exact dimensions for any target ratio or size constraint.
적용 수학 공식 및 방정식
이 Image Aspect Ratio Calculator는 5가지 핵심 수학 공식을 사용합니다:
1 Image Aspect Ratio ▼
A 6000 × 4000 image: GCD = 2000, so ratio = 3 : 2. This is the standard DSLR sensor ratio.
2 Proportional Resize (New Height) ▼
Resizing a 4000×3000 image to 1200px wide: New Height = 1200 × (3000/4000) = 900 pixels.
3 Megapixel Calculation ▼
A 6000 × 4000 image = 24,000,000 pixels = 24 megapixels.
Explore all calculation options on the 비율 계산기 home page.
비율 계산기 사용법
이 비율 계산기는 아래의 3단계로 쉽게 사용할 수 있습니다:
수치 입력하기
입력 칸에 알고 있는 비율 값을 입력합니다. 구하려는 미지수 자리의 칸 하나는 비워둡니다.
모드 선택하기
비율 모드(풀기, 간소화, 스케일링)를 선택합니다. 각 모드는 입력한 수치에 맞춰 다른 공식들을 적용합니다.
결과 확인하기
계산하기 버튼을 누릅니다. 결과 화면에 정답과 함께 시각적인 비율 바, 원형 차트, 상세한 단계별 풀이 과정이 출력됩니다.
실제 예제 문제 및 단계별 풀이
비율 계산기를 활용하여 아래 3가지 예제 문제를 단계별로 해결하는 과정입니다:
입력 1 Find aspect ratio of a 5184 × 3456 image
입력 2 Resize a 4032 × 3024 photo to 800px wide
입력 3 Calculate megapixels of 7680 × 4320
자주 묻는 질문 (FAQ)
What aspect ratio is a standard photo? ▼
Most DSLR cameras capture images in 3:2 aspect ratio (e.g., 6000×4000 or 4000×2667). Smartphones typically use 4:3 (e.g., 4032×3024). Medium format cameras often shoot 4:3 or 3:2. The 3:2 ratio matches standard 4×6 inch prints exactly.
How do I find the aspect ratio of my image? ▼
Divide the width by the height, then simplify. A 4032×3024 image: divide both by GCD (1008) = 4:3. A 6000×4000 image: divide both by GCD (2000) = 3:2. Or simply enter the dimensions into this calculator for instant results.
What aspect ratio is best for Instagram? ▼
Instagram supports 1:1 (square, 1080×1080), 4:5 (portrait, 1080×1350), and 1.91:1 (landscape, 1080×566) in the feed. Reels and Stories use 9:16 (1080×1920). Portrait 4:5 typically gets the most feed real estate and highest engagement.
How do I resize an image without losing quality? ▼
Always resize down (make smaller), never up significantly. Maintain the original aspect ratio by locking proportions. Use high-quality resampling algorithms (Lanczos, bicubic) in your image editor. Save in appropriate format: JPEG for photos, PNG for graphics with transparency, WebP for web optimization.
What aspect ratio does a 4×6 print use? ▼
A 4×6 inch print uses a 3:2 aspect ratio (6÷2=3, 4÷2=2). This matches standard DSLR sensor proportions, so 3:2 images print at 4×6 without any cropping. At 300 DPI print resolution, you need at least 1200×1800 pixels.
How do I convert a 16:9 image to 4:3? ▼
You must crop the sides (for landscape) because 16:9 is wider than 4:3. From a 1920×1080 (16:9) image: keeping the full height of 1080, the new width = 1080 × (4/3) = 1440. Crop 240 pixels from each side. Important content should be centered.
What image aspect ratio is best for websites? ▼
It depends on the use case. Hero banners: 16:9 or 21:9 (wide). Blog post images: 16:9 or 3:2. Product images: 1:1 or 4:3. Background images: match the viewport ratio. Set explicit width and height to prevent layout shift. Use srcset for responsive delivery.
Why does my image look stretched on social media? ▼
The platform is forcing your image into a different aspect ratio container. For example, uploading a 3:2 landscape image where the platform displays 1:1 squares causes visible stretching. Always crop to the platform's required ratio before uploading.
What is the difference between image aspect ratio and resolution? ▼
Aspect ratio is the shape (the proportional relationship, e.g., 3:2). Resolution is the total pixel count (e.g., 6000×4000 = 24 megapixels). Multiple resolutions share the same aspect ratio: 1920×1280, 3840×2560, and 6000×4000 are all 3:2.
How do I calculate the pixel dimensions for a custom aspect ratio? ▼
Multiply each ratio number by the same scale factor. For a 5:4 image at 2000px wide: Height = Width × (4÷5) = 2000 × 0.8 = 1600px. For a 5:4 image at 1200px tall: Width = Height × (5÷4) = 1200 × 1.25 = 1500px.
What aspect ratio should I use for YouTube thumbnails? ▼
YouTube thumbnails use 16:9 aspect ratio at 1280×720 pixels (720p). This is the minimum recommended resolution. For sharper thumbnails on high-resolution displays, use 1920×1080. Keep important text and faces in the center 80% (title-safe area).