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CSS Design Calc – Grid Column Width Calculator
x402
CSS Design Calc – Grid Column Width 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 column widths and span widths for an N-column grid from container width, column count, and gutter size — or reverse-calculates the container width from a known column width.
Price / call$0.02
Success—
StatusUnknown
How this service works
Column and span widths for an N-column grid from container width, columns and gutter, or the container for a column width.
Output
Returns column width in px, a list of span objects (span count, pixel width, percent of container, percent including gutter), total gutter width, container width, column percent, an optional CSS snippet, and a human-readable summary. If inputs are inconsistent or incomplete, a verdict and reasons array explain what could not be computed.
Example use cases
Responsive grid layout planning
“I'm building a website with a 1440px container, 12 columns, and 16px gutters — can you calculate the exact width of each column and all the multi-column spans so I can set up my CSS grid?”
Reverse-engineer container from column size
“I want each column to be exactly 72px wide in a 12-column grid with an 8px gutter. What total container width do I need?”
Quick span width lookup for a design system
“In a 24-column grid with a 1280px container and 20px gutters, what's the pixel width of a 6-column span and an 8-column span?”
Technical details
Endpoint
GEThttps://css-design-calc.x402tookit.com/grid-columns?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need precise, math-correct column and span width calculations for CSS grid or traditional column-based layouts — especially when you need all span widths at once, need a CSS snippet, or want to reverse-calculate container width from a target column width. Prefer it over manual calculation or general-purpose math tools because it understands CSS grid conventions (gutters, margins, spans) natively and returns design-ready percentages alongside pixel values.
Side effects
- Missing required 'columns' or 'gutter' parameters returns an error
- Providing neither 'containerWidth' nor 'columnWidth' results in an incomplete calculation
- Column count outside 1–48 range may be rejected or return degraded results
- Non-numeric values for numeric fields cause schema validation failure
- Conflicting containerWidth and columnWidth may yield a degraded or partial response with explanation in 'reasons'
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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