FreightUtils MCP Server

Freight Emissions Calculator

emissions_calculator

Read-onlyIdempotent

Estimate freight transport greenhouse-gas emissions (kgCO2e) for a shipment leg, per ISO 14083:2023 / GLEC Framework v3.2: emissions = mass x distance x a published emission-intensity factor (kgCO2e/tonne-km).

Provide mass + distance_km + mode (road | rail | sea | air | inland_waterway); optionally choose sub_mode, region/authority (uk = DEFRA, us = EPA, fr = ADEME) and basis (wtw default, or ttw). IMPORTANT: pass ACTUAL GROSS MASS, not chargeable/volumetric weight (a common air-freight mistake — see mass_basis in the result). Distance must be provided — this tool does NOT route, geocode, or compute distances.

Behavior: deterministic given the same factor edition; the fleet-average factor already includes average empty running (see empty_running) — do NOT add your own empty-return leg; sea and air are low-representativeness generic defaults (real emissions vary materially by vessel/aircraft, load factor and routing — see representativeness and the result summary). An unknown mode/sub_mode/region returns available:false with the covered options, never a fabricated factor. Rate-limited: a limit error carries reset_at, the UTC time the allowance resets.

Returns: well-to-wheel AND tank-to-wheel emissions where the factor has both, the exact factor used (value, authority, edition), the tonne-km activity and a per-result _source citing BOTH the ISO method and the specific published factor, all under result, plus confidence, _source and citation (the FreightUtils v1 response envelope).

Limitations: best-effort reference estimate from published factors (DEFRA / EPA / ADEME) — NOT a verified or audited carbon report.

Related: distinct from cbm_calculator / ldm_calculator / chargeable_weight_calculator (those size or bill a shipment; this one estimates its CO2e).

Input Schema

TableJSON Schema

Name	Required	Description
`mass`	Yes	Shipment mass, expressed in mass_unit. Example: 1000
`mode`	Yes	Transport mode
`basis`	No	Emissions basis: wtw = well-to-wheel incl. upstream energy (default), ttw = tank-to-wheel / operation only
`region`	No	Factor source/region: uk = DEFRA, us = EPA, fr = ADEME. Default is per-mode.
`sub_mode`	No	Optional sub-mode / vehicle class (e.g. "articulated", "container ship", "long-haul"). Omit for the representative default; an unknown value returns available:false with the covered list.
`mass_unit`	No	Unit for mass (default: kg)
`distance_km`	Yes	Transport distance in kilometres — you provide it; the tool does not route or compute distance

Output Schema

TableJSON Schema

Name	Required	Description	Default
`ok`	Yes
`result`	Yes
`_source`	Yes
`citation`	Yes
`validity`	No
`warnings`	No
`confidence`	Yes
`blocking_errors`	No
`envelope_version`	Yes
`normalized_input`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 8, 2026
- addedInput schema / additionalProperties
```
Added value: +false
```
Changed5 schema fields changedAug 11, 2026
- addedOutput schema / properties / _source / properties / authority_current_edition
```
Added value: +{
+  "type": "string"
+}
```
- addedOutput schema / properties / _source / properties / checked_at
```
Added value: +{
+  "type": "string"
+}
```
- addedOutput schema / properties / _source / properties / dataset_edition
```
Added value: +{
+  "type": "string"
+}
```
- removedOutput schema / properties / envelope_version / const
```
Removed value: -"1"
```
- addedOutput schema / properties / envelope_version / enum
```
Added value: +[
+  "1",
+  "1.1"
+]
```

Changed37 schema fields changedJul 9, 2026

removedOutput schema / properties / _source / description

Removed value: -"Citability envelope: ISO method + the specific open factor used (authority, edition, value, basis, last_verified date, source, licence)"

addedOutput schema / properties / _source / properties / checked
```
Added value: +{
+  "type": "string"
+}
```
removedOutput schema / properties / _source / properties / computed_by
```
Removed value: -{
-  "type": "string"
-}
```

removedOutput schema / properties / _source / properties / factor

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "authority": {
-      "type": "string"
-    },
-    "basis": {
-      "type": "string"
-    },
-    "edition": {
-      "type": "string"
-    },
-    "last_verified": {
-      "type": "string"
-    },
-    "licence": {
-      "type": "string"
-    },
-    "source_url": {
-      "type": "string"
-    },
-    "unit": {
-      "type": "string"
-    },
-    "value": {
-      "type": "number"
-    }
-  },
-  "required": [
-    "authority",
-    "edition",
-    "value",
-    "unit",
-    "basis",
-    "last_verified",
-    "source_url",
-    "licence"
-  ],
-  "type": "object"
-}

addedOutput schema / properties / _source / properties / name
```
Added value: +{
+  "type": "string"
+}
```

addedOutput schema / properties / _source / properties / provenance_status

Added value: +{
+  "enum": [
+    "verified",
+    "pending-verification",
+    "computed",
+    "live"
+  ],
+  "type": "string"
+}

removedOutput schema / properties / _source / properties / reference
```
Removed value: -{
-  "type": "string"
-}
```
removedOutput schema / properties / _source / properties / standard
```
Removed value: -{
-  "type": "string"
-}
```
removedOutput schema / properties / _source / properties / type
```
Removed value: -{
-  "type": "string"
-}
```

changedOutput schema / properties / _source / required

Previous value: -[
-  "type",
-  "standard",
-  "reference",
-  "source_url",
-  "computed_by",
-  "factor"
-]New value: +[
+  "name",
+  "checked",
+  "provenance_status"
+]

removedOutput schema / properties / available

Removed value: -{
-  "description": "True if a factor matched and emissions were computed; false if the combination is not covered",
-  "type": "boolean"
-}

removedOutput schema / properties / available_for

Removed value: -{
-  "additionalProperties": false,
-  "description": "Present when available:false — the covered modes/regions/sub-modes",
-  "properties": {
-    "modes": {
-      "items": {
-        "type": "string"
-      },
-      "type": "array"
-    },
-    "regions_for_mode": {
-      "items": {
-        "type": "string"
-      },
-      "type": "array"
-    },
-    "sub_modes": {
-      "items": {
-        "additionalProperties": false,
-        "properties": {
-          "id": {
-            "type": "string"
-          },
-          "region": {
-            "type": "string"
-          },
-          "sub_mode": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "region",
-          "id",
-          "sub_mode"
-        ],
-        "type": "object"
-      },
-      "type": "array"
-    }
-  },
-  "required": [
-    "modes",
-    "regions_for_mode",
-    "sub_modes"
-  ],
-  "type": "object"
-}

addedOutput schema / properties / blocking_errors

Added value: +{
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "code": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "recovery": {
+        "additionalProperties": false,
+        "properties": {
+          "action": {
+            "type": "string"
+          },
+          "params": {
+            "additionalProperties": {},
+            "propertyNames": {
+              "type": "string"
+            },
+            "type": "object"
+          },
+          "tool": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "action"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "code",
+      "message",
+      "recovery"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

addedOutput schema / properties / citation

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "qualifier": {
+      "type": "string"
+    },
+    "text": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "text"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / confidence / additionalProperties
```
Added value: +false
```

removedOutput schema / properties / confidence / description

Removed value: -"Human-readable confidence label for representativeness"

addedOutput schema / properties / confidence / properties

Added value: +{
+  "basis": {
+    "enum": [
+      "deterministic",
+      "provenance",
+      "match_quality",
+      "freshness"
+    ],
+    "type": "string"
+  },
+  "level": {
+    "enum": [
+      "high",
+      "medium",
+      "low"
+    ],
+    "type": "string"
+  },
+  "score": {
+    "maximum": 1,
+    "minimum": 0,
+    "type": "number"
+  }
+}

addedOutput schema / properties / confidence / required
```
Added value: +[
+  "level",
+  "basis"
+]
```
changedOutput schema / properties / confidence / type
```
Previous value: -"string"New value: +"object"
```

removedOutput schema / properties / disclaimer

Removed value: -{
-  "description": "Best-effort estimate; not a verified carbon report",
-  "type": "string"
-}

removedOutput schema / properties / emissions

Removed value: -{
-  "additionalProperties": false,
-  "description": "Computed emissions: WTW + TTW where available, plus the primary value per basis",
-  "properties": {
-    "basis_used": {
-      "type": "string"
-    },
-    "primary_kgco2e": {
-      "type": "number"
-    },
-    "ttw_kgco2e": {
-      "anyOf": [
-        {
-          "type": "number"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "wtw_kgco2e": {
-      "anyOf": [
-        {
-          "type": "number"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    }
-  },
-  "required": [
-    "wtw_kgco2e",
-    "ttw_kgco2e",
-    "primary_kgco2e",
-    "basis_used"
-  ],
-  "type": "object"
-}

removedOutput schema / properties / empty_running

Removed value: -{
-  "description": "Whether the fleet-average factor already embeds average empty running (\"sector_average_included\" → do NOT add your own empty-return leg) or the source does not state it (\"see_source\")",
-  "type": "string"
-}

addedOutput schema / properties / envelope_version

Added value: +{
+  "const": "1",
+  "type": "string"
+}

removedOutput schema / properties / factor

Removed value: -{
-  "additionalProperties": false,
-  "description": "The exact emission-intensity factor used",
-  "properties": {
-    "authority": {
-      "type": "string"
-    },
-    "edition": {
-      "type": "string"
-    },
-    "id": {
-      "type": "string"
-    },
-    "mode": {
-      "type": "string"
-    },
-    "region": {
-      "type": "string"
-    },
-    "sub_mode": {
-      "type": "string"
-    },
-    "ttw": {
-      "anyOf": [
-        {
-          "type": "number"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    },
-    "unit": {
-      "type": "string"
-    },
-    "wtw": {
-      "anyOf": [
-        {
-          "type": "number"
-        },
-        {
-          "type": "null"
-        }
-      ]
-    }
-  },
-  "required": [
-    "id",
-    "mode",
-    "sub_mode",
-    "authority",
-    "edition",
-    "region",
-    "unit",
-    "wtw",
-    "ttw"
-  ],
-  "type": "object"
-}

removedOutput schema / properties / inputs

Removed value: -{
-  "additionalProperties": false,
-  "description": "Echo of the resolved inputs (incl. defaults applied)",
-  "properties": {
-    "basis": {
-      "type": "string"
-    },
-    "distance_km": {
-      "type": "number"
-    },
-    "mass": {
-      "type": "number"
-    },
-    "mass_tonnes": {
-      "type": "number"
-    },
-    "mass_unit": {
-      "type": "string"
-    },
-    "mode": {
-      "type": "string"
-    },
-    "region": {
-      "type": "string"
-    },
-    "sub_mode": {
-      "type": "string"
-    }
-  },
-  "required": [
-    "mass",
-    "mass_unit",
-    "mass_tonnes",
-    "distance_km",
-    "mode",
-    "sub_mode",
-    "region",
-    "basis"
-  ],
-  "type": "object"
-}

removedOutput schema / properties / mass_basis

Removed value: -{
-  "description": "Mass basis the factor expects: always \"actual_gross_mass\" — NOT chargeable/volumetric weight (a common air-freight mistake)",
-  "type": "string"
-}

removedOutput schema / properties / message

Removed value: -{
-  "description": "Present when available:false — why no factor matched",
-  "type": "string"
-}

removedOutput schema / properties / methodology

Removed value: -{
-  "description": "ISO 14083:2023 / GLEC Framework v3.2",
-  "type": "string"
-}

addedOutput schema / properties / normalized_input

Added value: +{
+  "additionalProperties": {},
+  "propertyNames": {
+    "type": "string"
+  },
+  "type": "object"
+}

addedOutput schema / properties / ok
```
Added value: +{
+  "type": "boolean"
+}
```

removedOutput schema / properties / representativeness

Removed value: -{
-  "description": "How representative the generic default factor is: \"low\" for sea/air (varies materially by vessel/aircraft type, load, routing), \"medium\" for road/rail/inland",
-  "type": "string"
-}

addedOutput schema / properties / result

Added value: +{
+  "additionalProperties": {},
+  "propertyNames": {
+    "type": "string"
+  },
+  "type": "object"
+}

removedOutput schema / properties / summary

Removed value: -{
-  "description": "Primary human-readable one-line result — carries the empty-running + actual-gross-mass notes and, for sea/air, a high-variance warning. Surface this to the user, do not drop it.",
-  "type": "string"
-}

removedOutput schema / properties / tonne_km

Removed value: -{
-  "description": "Transport activity = mass (tonnes) × distance (km)",
-  "type": "number"
-}

addedOutput schema / properties / validity

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "as_of": {
+      "type": "string"
+    },
+    "effective_from": {
+      "type": "string"
+    },
+    "effective_to": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "required": [
+    "as_of"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / warnings

Added value: +{
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "code": {
+        "type": "string"
+      },
+      "details": {
+        "additionalProperties": {},
+        "propertyNames": {
+          "type": "string"
+        },
+        "type": "object"
+      },
+      "message": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "code",
+      "message"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

changedOutput schema / required

Previous value: -[
-  "available",
-  "methodology",
-  "disclaimer"
-]New value: +[
+  "envelope_version",
+  "ok",
+  "result",
+  "confidence",
+  "_source",
+  "citation"
+]

Changed8 schema fields changedJun 27, 2026

changedOutput schema / properties / _source / description

Previous value: -"Citability envelope: ISO method + the specific open factor used (authority, edition, value, basis, source, licence)"New value: +"Citability envelope: ISO method + the specific open factor used (authority, edition, value, basis, last_verified date, source, licence)"

addedOutput schema / properties / _source / properties / factor / properties / last_verified
```
Added value: +{
+  "type": "string"
+}
```

changedOutput schema / properties / _source / properties / factor / required

Previous value: -[
-  "authority",
-  "edition",
-  "value",
-  "unit",
-  "basis",
-  "source_url",
-  "licence"
-]New value: +[
+  "authority",
+  "edition",
+  "value",
+  "unit",
+  "basis",
+  "last_verified",
+  "source_url",
+  "licence"
+]

addedOutput schema / properties / confidence

Added value: +{
+  "description": "Human-readable confidence label for representativeness",
+  "type": "string"
+}

addedOutput schema / properties / empty_running

Added value: +{
+  "description": "Whether the fleet-average factor already embeds average empty running (\"sector_average_included\" → do NOT add your own empty-return leg) or the source does not state it (\"see_source\")",
+  "type": "string"
+}

addedOutput schema / properties / mass_basis

Added value: +{
+  "description": "Mass basis the factor expects: always \"actual_gross_mass\" — NOT chargeable/volumetric weight (a common air-freight mistake)",
+  "type": "string"
+}

addedOutput schema / properties / representativeness

Added value: +{
+  "description": "How representative the generic default factor is: \"low\" for sea/air (varies materially by vessel/aircraft type, load, routing), \"medium\" for road/rail/inland",
+  "type": "string"
+}

addedOutput schema / properties / summary

Added value: +{
+  "description": "Primary human-readable one-line result — carries the empty-running + actual-gross-mass notes and, for sea/air, a high-variance warning. Surface this to the user, do not drop it.",
+  "type": "string"
+}

AddedJun 23, 2026

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