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CSS Design Calc – CSS Unit Converter
x402
CSS Design Calc – CSS Unit Converter 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 2026-10-29).
Converts a CSS length value from one unit to another (px, rem, em, pt, pc, in, cm, mm, Q, vw, vh, vmin, vmax, %) using configurable root and viewport sizes.
Price / call$0.02
Success—
StatusUnknown
How this service works
Convert a CSS length between px, rem, em, pt, pc, in, cm, mm, Q, vw, vh, vmin, vmax and % with your root and viewport sizes.
Output
Returns the converted value in the target unit, the equivalent pixel value, a formatted CSS string ready to paste, a breakdown of the input value expressed in every supported unit simultaneously, and a human-readable summary. Optional fields include rootPx used, reasons for any caveats, and a verdict.
Example use cases
Responsive layout unit conversion
“I'm building a responsive layout and need to know what 360px is in rem and vw — my root font size is 16px and the viewport is 1440px wide.”
Print stylesheet pt conversion
“Convert 18px to pt so I can use it in my print stylesheet — also tell me what that is in cm and mm.”
Fluid viewport unit from fixed design spec
“My design spec says a component should be 120px tall on a 900px viewport — what is that in vh, and what would it be in vmin if the viewport width is also 1440px?”
Technical details
Endpoint
GEThttps://css-design-calc.x402tookit.com/css-unit-convert?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need precise, multi-unit CSS length conversion with configurable root font size, parent font size, and viewport dimensions — especially when working on responsive or print stylesheets where default assumptions would give wrong results. Prefer this over manual calculation or a generic unit converter when you need the result expressed simultaneously in all CSS units, or when the target is a relative unit (rem, em, vw, vh, %) that depends on context.
Side effects
- Missing required query parameters (value, from, to) returns an error
- Unsupported unit string returns a validation error
- Converting viewport-relative units (vw, vh, vmin, vmax) without specifying viewportW or viewportH uses defaults (1440×900) which may not match the actual target device
- Converting em or % without specifying parentPx uses rootPx as fallback, which may be inaccurate if parent differs from root
- Non-numeric value input causes a parsing error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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