Car drive CO2 emissions calculator API

Compute driving CO2e from distance and fuel economy via fuel-burn stoichiometry: litres = distance x L/100km / 100, then x fuel emission factor (gasoline 2.31, diesel 2.68, lpg 1.51, e85 1.56 kg CO2/L). Accepts L/100km or US mpg (converted via 235.215/mpg) and supports passengers and round-trip. Returns litres burned, total/per-km/per-passenger kg CO2e and tree equivalents. Answers 'CO2 of a 100km drive','emissions per km for my car','diesel vs gasoline footprint','carpool emissions per person'.

Price$0.01per request

MethodPOST

Route/v1/calc/carbon-car-drive-emissions

StatusLive

MIME typeapplication/json

Rate limit120/minute

CacheNo cache

carboncardrivingemissionsco2fuelfootprinttransport

API URLhttps://x402.hexl.dev/v1/calc/carbon-car-drive-emissions

Integration docs

Example request

{
  "distanceKm": 100,
  "fuelEconomyL100km": 8
}

Example response

{
  "distanceKm": 100,
  "fuelType": "gasoline",
  "fuelEconomyL100km": 8,
  "emissionFactorKgPerLitre": 2.31,
  "litresBurned": 8,
  "totalKgCO2e": 18.48,
  "perPassengerKgCO2e": 18.48,
  "perKmKgCO2e": 0.185,
  "totalTonnesCO2e": 0.018,
  "equivalentTrees": 0.88
}

Input schema

{
  "type": "object",
  "required": [
    "distanceKm"
  ],
  "properties": {
    "distanceKm": {
      "type": "number",
      "examples": [
        100
      ]
    },
    "fuelType": {
      "type": "string",
      "enum": [
        "gasoline",
        "diesel",
        "lpg",
        "e85"
      ],
      "default": "gasoline"
    },
    "fuelEconomyL100km": {
      "type": "number",
      "examples": [
        8
      ]
    },
    "mpg": {
      "type": "number",
      "description": "US mpg, alternative to fuelEconomyL100km"
    },
    "passengers": {
      "type": "number",
      "default": 1
    },
    "roundTrip": {
      "type": "boolean",
      "default": false
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}