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GET /v1/doubling-time

Doubling time

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

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

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Code snippets

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

Example response

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

{
    "data": {
        "note": "Doubling time = ln2 / r. For a percentage growth per period the quick estimate is the Rule of 70 (70 / percent).",
        "inputs": {
            "rate": 0.05
        },
        "rule_of_70": 10,
        "doubling_time": 13.862944
    },
    "meta": {
        "timestamp": "2026-06-05T19:50:17.345Z",
        "request_id": "896db1f4-2eea-4d56-bca3-3fe612c03885"
    },
    "status": "ok",
    "message": "Doubling time",
    "success": true
}