Calories from watts (Concept2)

Code snippets

curl "https://api.oanor.com/rowing-api/v1/calories" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/rowing-api/v1/calories", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/rowing-api/v1/calories");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/rowing-api/v1/calories",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "Concept2 estimates calories from power, not pace: Cal/hr = (watts × 4 × 0.8604) + 300. The +300 is a fixed resting-metabolism term, which is why even an easy paddle burns a baseline rate and why the erg's calorie count runs higher than pure mechanical work. 200 W is about 988 Cal/hr; over 30 minutes that is roughly 494 Cal. It is a machine estimate, not a substitute for indirect calorimetry.",
        "inputs": {
            "watts": 200,
            "duration_min": 30
        },
        "total_calories": 494.2,
        "calories_per_hour": 988.3
    },
    "meta": {
        "timestamp": "2026-06-07T08:17:52.585Z",
        "request_id": "bdbe1d6d-ddff-4fdb-b429-8aca94b0d5f8"
    },
    "status": "ok",
    "message": "Calories",
    "success": true
}