Relative fat mass (RFM) from height, waist, and sex (Woolcott 2018)
Relative fat mass (RFM) from height, waist, and sex (Woolcott 2018). Height and waist in meters in the paper; magent accepts height_cm or height_in and waist_cm. Deterministic published arithmetic with citation. Not a medical device, not a body-fat diagnosis, and not later obesity cutoffs. magent does not measure the patient.
Asked 1.4x its listed price for its own exampleour last check, 2026-09-28
1 of 1checks answered this week
254 msmedian answer time
$0.005listed price per call
$0.007price 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
POST https://api.magentlab.com/api/calc/rfm
| Category | Everything else |
|---|---|
| Provider host | api.magentlab.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 0 from 0 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-28 | valid payment request | 402 | $0.007 | 254 ms |
Example input (from the provider)
{
"body": {
"items": [
{
"height_cm": 180,
"height_in": 70,
"sex": "male",
"waist_cm": 90
},
{
"height_cm": 180,
"height_in": 70,
"sex": "male",
"waist_cm": 90
}
]
},
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"items": {
"items": {
"properties": {
"height_cm": {
"description": "Height in centimeters. Provide height_cm or height_in.",
"type": "number"
},
"height_in": {
"description": "Height in inches. Converted as cm = in * 2.54.",
"type": "number"
},
"sex": {
"description": "Sex used by Woolcott 2018 (0 male, 1 female in the RFM equation).",
"enum": [
"female",
"male"
],
"type": "string"
},
"waist_cm": {
"description": "Waist circumference in centimeters (40-200). Converted to meters for RFM.",
"type": "number"
}
},
"required": [
"waist_cm",
"sex"
],
"type": "object"
},
"maxItems": 25,
"minItems": 1,
"type": "array"
}
},
"required": [
"items"
],
"type": "object"
},
"headers": {
"additionalProperties": {
"type": "string"
},
"type": "object"
},
"method": {
"const": "POST",
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}