---
title: "Body Fat Calculator"
method: GET
path: "/api/calc/body-fat-calculator"
tags: ["Health"]
---

# Body Fat Calculator

`GET /api/calc/body-fat-calculator`

## Request

- Base URL: `https://calcbright.com`
- URL: `https://calcbright.com/api/calc/body-fat-calculator`
- Auth: none declared

Body fat % from a tape measure with the US Navy (Hodgdon–Beckett) formula: enter neck, waist and hips to get your ACE category, fat mass and lean mass.

## Query parameters

- `units` 'metric' | 'imperial': Units
- `sex` 'male' | 'female': Sex
- `cm` number: Height (cm)
- `ft` number: Height (ft)
- `inch` number: (in)
- `kg` number: Weight (kg)
- `lb` number: Weight (lb)
- `neckCm` number: Neck (below the larynx) (cm)
- `neckIn` number: Neck (below the larynx) (in)
- `waistCm` number: Waist (men: at navel · women: narrowest) (cm)
- `waistIn` number: Waist (men: at navel · women: narrowest) (in)
- `hipCm` number: Hips (widest point) (cm)
- `hipIn` number: Hips (widest point) (in)

## Response `200`

Calculation result

- CalcOutput
  - `ok` boolean
  - `tool` string
  - `name` string
  - `url` string: Open this link to see the full calculation
  - `inputs` object
  - `summary` string: Plain-text answer
  - `details` string
  - `result` object
  - `errors` object

## Other responses

- `400`: Invalid input (see errors)

---

[API](https://skmtc.dev/calcbright/apis/calcbright-calculator-api.md) · [All operations](https://skmtc.dev/calcbright/apis/calcbright-calculator-api/llms.txt) · [OpenAPI document](https://skmtc.dev/calcbright/apis/calcbright-calculator-api/revisions/f58229e56e58?raw)