Aspect Ratio Calculator
Calculate and convert aspect ratios for images and videos. Input dimensions to find the perfect width and height ratio for your projects.
Find missing image or video dimensions, simplify any width × height to its lowest aspect ratio, or resize media to fit a target ratio with contain or cover modes.
Common ratios
Scale dimensions while keeping a ratio
Simplify width × height to its lowest ratio
Resize to a target ratio (fit or cover)
What is an aspect ratio?
An aspect ratio expresses the relationship between width and height as two numbers separated by a colon, such as 16:9 or 1:1. It defines the shape of an image, video, or screen independently of its actual size in pixels - useful when you need to resize media without distortion.
Aspect ratio formula
New height = New width × (Ratio H ÷ Ratio W)
Example: a 16:9 image at 1920 px wide has height = 1920 × (9 ÷ 16) = 1080 px.
Common aspect ratios
- 16:9 - Standard widescreen - YouTube, modern monitors, HDTV.
- 9:16 - Vertical video - TikTok, Instagram Reels, YouTube Shorts.
- 4:3 - Classic TV and old monitor format, still common in print.
- 1:1 - Square - Instagram feed posts and profile pictures.
- 21:9 - Cinematic ultrawide - used in movies and ultrawide monitors.
Use this tool from your AI agent
Free JSON API and Model Context Protocol (MCP) server. No signup, no API key, CORS open. Designed for Claude, ChatGPT, Cursor, scripts and frontend apps.
curl -X POST https://mate.tools/api/v1/aspect-ratio.php \
-H "Content-Type: application/json" \
-d '{"width":1920,"height":1080}'import urllib.request, json
req = urllib.request.Request(
"https://mate.tools/api/v1/aspect-ratio.php",
data=json.dumps({"width":1920,"height":1080}).encode(),
headers={"Content-Type": "application/json"},
)
with urllib.request.urlopen(req) as r:
print(json.load(r))const r = await fetch("https://mate.tools/api/v1/aspect-ratio.php", {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({"width":1920,"height":1080}),
});
console.log(await r.json()); Add to claude_desktop_config.json (Claude Desktop), ~/.cursor/mcp.json (Cursor), or any other MCP-compatible client:
{
"mcpServers": {
"mate-tools": {
"command": "npx",
"args": ["-y", "@mate-tools/mcp-server"]
}
}
}