Ratio Converter & Calculator
Analyze ratios, solve proportions, and calculate aspect ratio resizing.
Visual Distribution
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Part 2 (9)
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Master Every Proportion
Ratio Converter is the ultimate tool for designers, developers, and students. Whether you are resizing an image for the web, calculating the perfect 16:9 crop for video, or solving a complex math proportion (A:B = C:X), our tool handles the math instantly.
Aspect Ratio Control
Resize images without distortion. Enter your original dimensions and a new width to get the perfect height automatically.
Solve for X
Stuck on a proportion? Enter any three values in our "Solve Proportion" tab to instantly find the missing fourth value.
Deep Analysis
Turn any ratio (e.g., 5:3) into percentages (62.5%), decimals (1.66), and simplified fractions instantly.
Understanding Aspect Ratios
An aspect ratio describes the proportional relationship between the width and height of an image or screen. It is usually expressed as two numbers separated by a colon, like 16:9.
- 16:9The standard for HD television, YouTube, and most modern computer monitors.
- 4:3Traditional SD television, iPad screens, and older computer monitors.
- 9:16Vertical video format used by TikTok, Instagram Reels, and YouTube Shorts.
- 21:9Ultrawide cinema standard, providing a more immersive movie experience.
Common Ratio Applications
Digital Design
UI designers use the Golden Ratio (1.618) to create aesthetically pleasing layouts.
Photography
Cameras typically shoot in 3:2 (DSLR) or 4:3 (Micro Four Thirds).
Cooking
Rice cooking often uses a 1:2 ratio (1 part rice, 2 parts water).
Common Mistakes
- •Ignoring Units: A ratio of 1:2 only works if both sides align (e.g., inches to inches). Don't mix inches and centimeters.
- •Reverse Logic: Confusing 16:9 (Landscape) with 9:16 (Portrait) can ruin a video upload.
Pro Tips
- •Use "Solve for X": When scaling an image, just enter the original W/H and new Width to get the exact Height.
- •Simplify First: Always reduce large ratios (1920:1080) to their simplest form (16:9) to understand the shape better.
Frequently Asked Questions
How do I calculate aspect ratio?
Divide width by height. Simplification involves finding the Greatest Common Divisor (GCD) of both numbers. Our tool does this automatically, turning 1920x1080 into 1.77 (decimal) or 16:9 (ratio).
What is the Golden Ratio?
The Golden Ratio is approximately 1.618:1. It is found in nature and art and is considered visually perfect. Designers use it to determine the width of columns or sidebars relative to the main content.
How do I resize images proportionally?
Use our Resize tab. Enter your original image dimensions (e.g., 4000x3000) and your desired target width (e.g., 1000). The tool will calculate the exact height needed to prevent stretching.
What ratio is Instagram?
Instagram uses 1:1 (Square) for profile pics, 4:5 (Portrait) for feed posts, and 9:16 (Vertical) for Stories and Reels.
How to calculate Gear Ratio?
Divide the number of teeth on the driven gear by the number of teeth on the driver gear. A ratio of 4:1 means the driver turns 4 times for every 1 turn of the driven gear.
Can I use decimals in ratios?
Yes. Our tool supports ratios like 1.5 : 4.5. It treats them mathematically identically to whole numbers and can even simplify them (e.g., to 1:3).
How to calculate percentage from ratio?
Add the total parts. For a 1:4 ratio, total is 5. Divide the part by the total (1/5 = 0.20) and multiply by 100 (20%).
What is the aspect ratio of 1920x1080?
It is 16:9. This is the global standard for High Definition (HD) and Full HD (FHD) video.
Does this tool assume Width:Height?
By convention, screen resolutions are written as Width:Height. However, for pure math ratios, the order only matters relative to what you are comparing (e.g., Flour:Sugar).
How to write a ratio as a fraction?
A ratio of A:B can be written as the fraction A/B. For example, a slope of 1:12 means 1 unit rise for every 12 units run (1/12).
What is 4k resolution ratio?
Standard UHD 4K (3840x2160) is still 16:9, just with 4 times the pixels of 1080p. DCI 4K (Cinema) uses slightly different ratios (~17:9 or 19:10).
Why is my simplified ratio weird?
If your numbers don't share a common divisor, they cannot be simplified further (e.g. 13:7). This is called being "relatively prime" or "coprime".