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GET
/
v1
/
hotel-stays
/
{hotel_stay_id}
/
impact-calculation
Hotel Stay Impact Calculation
const options = {
  method: 'GET',
  headers: {'x-api-key': '<x-api-key>', 'x-organization-id': '<x-organization-id>'}
};

fetch('https://api.dcycle.io/v1/hotel-stays/{hotel_stay_id}/impact-calculation', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));
import requests

url = "https://api.dcycle.io/v1/hotel-stays/{hotel_stay_id}/impact-calculation"

headers = {
    "x-api-key": "<x-api-key>",
    "x-organization-id": "<x-organization-id>"
}

response = requests.get(url, headers=headers)

print(response.text)
curl --request GET \
  --url https://api.dcycle.io/v1/hotel-stays/{hotel_stay_id}/impact-calculation \
  --header 'x-api-key: <x-api-key>' \
  --header 'x-organization-id: <x-organization-id>'
{
  "total_co2e": 123,
  "periods": [
    {
      "start_date": "<string>",
      "end_date": "<string>",
      "coincidence": "<string>",
      "co2e": 123,
      "details": [
        {}
      ]
    }
  ]
}

​
Hotel Stay Impact Calculation

Returns the step-by-step emission calculation for a specific hotel stay, showing exactly how the CO2e figure was derived from the DEFRA room-night emission factor.

​
Request

​
Headers

​
x-api-key
string
required
Your API key for authenticationExample: sk_live_1234567890abcdef
​
x-organization-id
string
required
Your organization UUIDExample: a8315ef3-dd50-43f8-b7ce-d839e68d51fa

​
Path Parameters

​
hotel_stay_id
string
required
The unique identifier (UUID) of the hotel stay recordExample: 550e8400-e29b-41d4-a716-446655440000

​
Response

The response contains the full step-by-step calculation breakdown as used by the Dcycle kernel.
​
total_co2e
number
Total CO2e in kg across all periods
​
periods
array
Calculation periods, one per date range

​
Calculation Methodology

CO2e is computed as: 
CO2e (kg) = rooms × nights × EF (kg CO2e / room-night)
Where:
  • nights = check_out_date − check_in_date in days
  • EF = DEFRA hotel room-night emission factor for the stay’s country (from the defra_hotel_stays kernel activity, HOTEL_STAYS category)
One total_impacts row is written per night so that partial-period exports and dashboards pro-rate correctly.

​
Example

curl -X GET "https://api.dcycle.io/v1/hotel-stays/550e8400-e29b-41d4-a716-446655440000/impact-calculation" \
  -H "x-api-key: ${DCYCLE_API_KEY}" \
  -H "x-organization-id: ${DCYCLE_ORG_ID}"

import requests
import os

response = requests.get(
    "https://api.dcycle.io/v1/hotel-stays/550e8400-e29b-41d4-a716-446655440000/impact-calculation",
    headers={
        "x-api-key": os.getenv("DCYCLE_API_KEY"),
        "x-organization-id": os.getenv("DCYCLE_ORG_ID")
    }
)
print(response.json())

const axios = require('axios');

const hotelStayId = '550e8400-e29b-41d4-a716-446655440000';

axios.get(`https://api.dcycle.io/v1/hotel-stays/${hotelStayId}/impact-calculation`, {
  headers: {
    'x-api-key': process.env.DCYCLE_API_KEY,
    'x-organization-id': process.env.DCYCLE_ORG_ID,
  },
}).then(response => {
  console.log(`Total CO2e: ${response.data.total_co2e} kg`);
});

​
Successful Response

{
  "total_co2e": 0.312,
  "periods": [
    {
      "start_date": "2025-03-10",
      "end_date": "2025-03-13",
      "coincidence": "exact",
      "co2e_scope_3": 0.312,
      "co2e": 0.312,
      "details": [
        {
          "scope": "scope_3",
          "category": "hotel_stays",
          "co2e": [
            {
              "step": 1,
              "raw_value": { "value": 3, "unit": "room-night" },
              "conversion_factor": { "value": 0.104, "type": "final_conversion" },
              "calculated_value": { "value": 0.312, "unit": "kg CO2e" },
              "source": {
                "source_id": "defra-2025",
                "source_name": "DEFRA",
                "source_version": "2025",
                "source_reference_year": 2025
              },
              "coincidence": "exact"
            }
          ],
          "co2e_from_ch4": [],
          "co2e_from_n2o": [],
          "co2e_from_co2": [],
          "co2_biogenic": []
        }
      ]
    }
  ]
}

​
Common Errors

​
401 Unauthorized

Cause: Missing or invalid API key 
{"detail": "Invalid API key for organization", "code": "INVALID_API_KEY"}

​
403 Forbidden

Cause: The authenticated user is not a member of the organization 
{"detail": "Logged User is not Member of Organization", "code": "LOGGED_USER_NOT_MEMBER"}

​
404 Not Found

Cause: The hotel stay ID does not exist or belongs to a different organization. 
{
  "detail": "Hotel stay not found",
  "code": "HOTEL_STAY_NOT_FOUND"
}

Get Hotel Stay

Retrieve full stay details

List Hotel Stays

Browse all stays for the organization