curl --request POST \
  --url https://api.iotools.cloud/v1/tool/mulch-soil-gravel-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "material": "mulch",
  "unitSystem": "imperial",
  "length": "10",
  "width": "20",
  "depth": "3",
  "wastePct": "10",
  "bagSize": "2",
  "truckCapacity": "2"
}
'

{
  "tool": "mulch-soil-gravel-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "result": [
      {
        "metric": "Material",
        "value": "Mulch"
      },
      {
        "metric": "Coverage Area",
        "value": "200.0 sq ft (18.6 m²)"
      },
      {
        "metric": "Volume Needed",
        "value": "1.85 yd³ (1.42 m³)"
      },
      {
        "metric": "Volume With 10% Waste",
        "value": "2.04 yd³ (1.56 m³)"
      },
      {
        "metric": "Estimated Weight",
        "value": "1019 lbs (462 kg)"
      },
      {
        "metric": "Bags Needed",
        "value": "28 bags (at 2.00 ft³ ≈ 56.6 L per bag)"
      },
      {
        "metric": "Truck Loads",
        "value": "2 trip(s) (~1.02 loads at 2.00 yd³ ≈ 1.53 m³ per load)"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}