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GET /v1/convert

Convert percent / angle / ratio / per-mille

Try it live

10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/slope-api

It works. Grab an API key and use it in your project.

Get an API key

Code snippets

curl "https://api.oanor.com/slope-api/v1/convert" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/slope-api/v1/convert", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/slope-api/v1/convert");
curl_setopt($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/slope-api/v1/convert",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

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

{
    "data": {
        "note": "Slope m = rise ÷ run = tan(angle). Grade % = m × 100; ratio is 1:(run per unit rise).",
        "input": [],
        "ratio": "1:10",
        "per_mille": 100,
        "rise_per_run": 0.1,
        "angle_degrees": 5.7106,
        "grade_percent": 10
    },
    "meta": {
        "timestamp": "2026-06-04T01:59:14.361Z",
        "request_id": "1f407d65-909e-4305-bce3-d823600be5fb"
    },
    "status": "ok",
    "message": "Slope conversion",
    "success": true
}