Dew point & humidity (psychrometrics) API

From dry-bulb temperature and relative humidity computes saturation & actual vapor pressure (Magnus), dew-point temperature (Magnus inversion), humidity ratio (kg/kg), and absolute humidity (g/m³). Answers 'What is the dew point at this temperature and humidity?', 'What is the humidity ratio of moist air?'.

Price$0.06per request

MethodPOST

Route/v1/engineering/psychrometrics

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

engineeringthermofluidshvacpsychrometricsdew-pointhumidityhumidity-ratiovapor-pressuremoist-air

API URLhttps://x402.hexl.dev/v1/engineering/psychrometrics

Integration docs

Example request

{
  "dryBulbC": 25,
  "relativeHumidityPercent": 60
}

Example response

{
  "dryBulbC": 25,
  "relativeHumidityPercent": 60,
  "pressurePa": 101325,
  "saturationVaporPressurePa": 3161.736,
  "actualVaporPressurePa": 1897.0416,
  "dewPointC": 16.6977,
  "humidityRatioKgKg": 0.01186644,
  "humidityRatioGKg": 11.8664,
  "absoluteHumidityGm3": 13.787,
  "formula": "Magnus: es = 6.1094*exp(17.625T/(243.04+T)); Td from inversion; W = 0.622e/(P-e)",
  "interpretation": "Dew point is the temperature at which this air becomes saturated; condensation occurs below it."
}

Input schema

{
  "type": "object",
  "required": [
    "dryBulbC",
    "relativeHumidityPercent"
  ],
  "properties": {
    "dryBulbC": {
      "type": "number",
      "description": "dry-bulb air temperature (°C)",
      "examples": [
        25
      ]
    },
    "relativeHumidityPercent": {
      "type": "number",
      "description": "relative humidity (0-100 %)",
      "examples": [
        60
      ]
    },
    "pressurePa": {
      "type": "number",
      "description": "ambient pressure (Pa); default 101325"
    }
  }
}

Output schema

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