Convert a CSS length between px, rem, em, pt, pc, in, cm, mm, Q, vw, vh, vmin, v
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.
Answeringour last check, 2026-10-21
1 of 1checks answered this week
1645 msmedian answer time
$0.02listed price per call
$0.02price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://css-design-calc.x402tookit.com/css-unit-convert
| Category | Everything else |
|---|---|
| Provider host | css-design-calc.x402tookit.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-21 | valid payment request | 402 | $0.02 | 1645 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"from": "px",
"rootPx": 16,
"to": "rem",
"value": 18
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"from": {
"description": "Source unit: px, rem, em, pt, pc, in, cm, mm, q, vw, vh, vmin, vmax or %",
"enum": [
"px",
"rem",
"em",
"pt",
"pc",
"in",
"cm",
"mm",
"q",
"vw",
"vh",
"vmin",
"vmax",
"%"
],
"type": "string"
},
"parentPx": {
"description": "Parent font size in px for em and % (default = rootPx)",
"type": "number"
},
"rootPx": {
"description": "Root font size in px for rem (default 16)",
"type": "number"
},
"to": {
"description": "Target unit (same choices)",
"enum": [
"px",
"rem",
"em",
"pt",
"pc",
"in",
"cm",
"mm",
"q",
"vw",
"vh",
"vmin",
"vmax",
"%"
],
"type": "string"
},
"value": {
"description": "The number to convert",
"type": "number"
},
"viewportH": {
"description": "Viewport height in px for vh, vmin, vmax (default 900)",
"type": "number"
},
"viewportW": {
"description": "Viewport width in px for vw, vmin, vmax (default 1440)",
"type": "number"
}
},
"required": [
"value",
"from",
"to"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"allUnits": {
"properties": {
"%": {
"type": [
"null",
"number"
]
},
"cm": {
"type": [
"null",
"number"
]
},
"em": {
"type": [
"null",
"number"
]
},
"in": {
"type": [
"null",
"number"
]
},
"mm": {
"type": [
"null",
"number"
]
},
"pc": {
"type": [
"null",
"number"
]
},
"pt": {
"type": [
"null",
"number"
]
},
"px": {
"type": [
"null",
"number"
]
},
"q": {
"type": [
"null",
"number"
]
},
"rem": {
"type": [
"null",
"number"
]
},
"vh": {
"type": [
"null",
"number"
]
},
"vmax": {
"type": [
"null",
"number"
]
},
"vmin": {
"type": [
"null",
"number"
]
},
"vw": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"asOf": {
"type": [
"null",
"string"
]
},
"css": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"input": {
"properties": {
"unit": {
"type": [
"null",
"string"
]
},
"value": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"parentPx": {
"type": [
"null",