getfitcraft.com
A gamified AI fitness app built by exercise scientists to solve the #1 fitness problem: quitting. Streaks, quests, and an AI coach make showing up easier.
First seen 2026-10-19 · Last seen 2026-10-19 · Source: webmcp.com
Answer 1 · Act 15 · Transact 0 · Score: Not yet scored
Tool inspector
calculate_ffmi
Calculate fat-free mass index (FFMI), height-normalized FFMI, lean body mass and fat mass from height, weight and sex, with an optional body fat percentage. With body fat, fat-free mass is weight x (1 - body fat); without it, lean body mass is estimated with the Boer 1984 formula. Returns a sourced category band (Schutz et al. 2002 population medians, ESPEN low cutoffs, college-athlete norms, and the 25.0 value Kouri et al. 1995 observed in steroid-free athletes, presented as an observation rather than a hard ceiling). Mirrors the FitCraft FFMI Calculator page.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
sex |
string | yes | Sex; selects the Boer formula coefficients and the reference bands. |
height |
number | yes | Height. |
height_unit |
string | yes | Height unit. |
weight |
number | yes | Body weight. |
weight_unit |
string | yes | Weight unit. |
body_fat_percent |
number | no | Optional body fat percentage. Supplying it switches from the Boer estimate to a direct fat-free mass calculation. |
Raw JSON schema
{
"type": "object",
"additionalProperties": false,
"properties": {
"sex": {
"type": "string",
"enum": [
"male",
"female"
],
"description": "Sex; selects the Boer formula coefficients and the reference bands."
},
"height": {
"type": "number",
"description": "Height.",
"minimum": 48,
"maximum": 230
},
"height_unit": {
"type": "string",
"enum": [
"cm",
"in"
],
"description": "Height unit."
},
"weight": {
"type": "number",
"description": "Body weight.",
"minimum": 20,
"maximum": 700
},
"weight_unit": {
"type": "string",
"enum": [
"kg",
"lb"
],
"description": "Weight unit."
},
"body_fat_percent": {
"type": "number",
"description": "Optional body fat percentage. Supplying it switches from the Boer estimate to a direct fat-free mass calculation.",
"minimum": 3,
"maximum": 60
}
},
"required": [
"sex",
"height",
"height_unit",
"weight",
"weight_unit"
]
}
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