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CSS Design Calc – Aspect Ratio Calculator
x402
CSS Design Calc – Aspect Ratio Calculator is a paid API for AI agents from css-design-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).
Calculates the simplified aspect ratio of a width/height pair, or derives the missing dimension from a known ratio, and returns CSS-ready values including css-aspect-ratio and padding-top percent.
Price / call$0.02
Success—
StatusUnknown
How this service works
Aspect ratio of a width and height (simplified, nearest common ratio) or the missing side for a ratio, with CSS values.
Output
Returns the simplified ratio (e.g. '16:9'), nearest common ratio from a list of standard ratios, how close the input is to that common ratio as a percentage difference, the CSS aspect-ratio property string (e.g. '16 / 9'), the padding-top percent for the old percentage-padding responsive trick, the ratio as a decimal number, orientation (landscape/portrait/square), and optionally the derived missing side when only one dimension and a ratio are supplied.
Example use cases
Responsive iframe padding-top hack
“I have a video embed that's 1280 by 720 pixels — what's the padding-top percentage I should use to keep it responsive, and what's the nearest common ratio?”
Derive missing dimension from ratio
“I know my banner needs to follow a 16:9 ratio and the width is 960px — can you calculate the correct height for me and give me the CSS aspect-ratio string?”
Identify ratio for arbitrary dimensions
“My designer gave me a container that's 1350 wide and 900 tall. What's the simplified aspect ratio, the nearest standard ratio like 4:3 or 3:2, and how far off is it as a percentage?”
Technical details
Endpoint
GEThttps://css-design-calc.x402tookit.com/aspect-ratio?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need CSS-specific aspect ratio outputs (the css-aspect-ratio string and padding-top percent) rather than a plain ratio simplification. It is particularly useful when building responsive layouts and needing to cross-reference against common named ratios like 16:9, 4:3, or 3:2 in a single call. Prefer this over generic math tools when the output needs to feed directly into CSS properties.
Side effects
- Missing both ratio and at least one dimension — returns error or empty result
- Ratio string in unrecognised format — may fail to parse
- Width or height of zero or negative — undefined mathematical result
- Providing only a ratio with no width or height — cannot derive a missing side
- Network or service downtime — HTTP error response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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