VO2 max estimate (Cooper / HR-ratio) API

Estimate VO2max via the Cooper 12-minute run test ((meters − 504.9)/44.73) or the Uth-Sorensen heart-rate ratio (15.3·HRmax/HRrest), with a fitness rating. Answers 'what's my VO2 max', 'VO2 max from a Cooper test', 'aerobic fitness from heart rate', 'estimate VO2max'.

Price$0.01per request

MethodPOST

Route/v1/health/vo2-max

StatusLive

MIME typeapplication/json

Rate limit120/minute

CacheNo cache

healthvo2-maxcooperuth-sorensenaerobiccardiofitnesscalculator

API URLhttps://x402.hexl.dev/v1/health/vo2-max

Integration docs

Example request

{
  "op": "cooper",
  "distanceMeters": 2800
}

Example response

{
  "vo2Max": 51.3,
  "method": "Cooper 12-minute run test",
  "formula": "(meters - 504.9) / 44.73",
  "inputs": {
    "distanceMeters": 2800
  },
  "rating": "very good"
}

Input schema

{
  "type": "object",
  "required": [],
  "properties": {
    "op": {
      "type": "string",
      "enum": [
        "cooper",
        "hrRatio"
      ],
      "default": "cooper"
    },
    "distanceMeters": {
      "type": "number",
      "description": "Distance run in 12 min (cooper)",
      "examples": [
        2800
      ]
    },
    "maxHr": {
      "type": "number",
      "examples": [
        187
      ]
    },
    "restingHr": {
      "type": "number",
      "examples": [
        60
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}