curl --request POST \
  --url https://api.iotools.cloud/v1/tool/paint-coverage-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "unitSystem": "metric",
  "roomLength": "5",
  "roomWidth": "4",
  "roomHeight": "2.5",
  "includeCeiling": "",
  "doorCount": "1",
  "windowCount": "1",
  "finishPreset": "matte",
  "coverageRate": "",
  "coats": "2",
  "canSize": "5",
  "wasteFactor": "10"
}
'

{
  "tool": "paint-coverage-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "results": [
      {
        "metric": "Total wall area",
        "value": "45.00 m²"
      },
      {
        "metric": "Ceiling area",
        "value": "Not included"
      },
      {
        "metric": "Door / window deductions",
        "value": "-3.24 m² (1 door, 1 window)"
      },
      {
        "metric": "Net paintable area",
        "value": "41.76 m²"
      },
      {
        "metric": "Total coated area",
        "value": "83.52 m² (2 coats)"
      },
      {
        "metric": "With waste factor",
        "value": "91.87 m² (+10%)"
      },
      {
        "metric": "Paint required",
        "value": "7.66 L"
      },
      {
        "metric": "Cans to buy",
        "value": "2 cans"
      }
    ],
    "summary": "41.76 m² net · 2 coats · 7.66 L paint · 2 × 5.00 L cans"
  },
  "credits_used": 3,
  "credits_remaining": null
}