Gear ratio calculator API

Compute gear ratio (driven/driver) and classify reduction vs overdrive, optionally transforming input RPM (÷ratio) and torque (×ratio). Answers 'gear ratio of 12 and 36 teeth','output RPM through this gearset','output torque after the reduction'.

Price$0.01per request

MethodPOST

Route/v1/calc/eng-gear-ratio

StatusLive

MIME typeapplication/json

Rate limit120/minute

CacheNo cache

calcengineeringmechanicalgear-ratiotorquerpmdrivetraintransmission

API URLhttps://x402.hexl.dev/v1/calc/eng-gear-ratio

Integration docs

Example request

{
  "driverTeeth": 12,
  "drivenTeeth": 36,
  "inputRpm": 3000,
  "inputTorqueNm": 10
}

Example response

{
  "driverTeeth": 12,
  "drivenTeeth": 36,
  "gearRatio": 3,
  "ratioLabel": "3:1",
  "type": "reduction (torque up, speed down)",
  "formula": "ratio = driven / driver",
  "outputRpm": 1000,
  "outputTorqueNm": 30
}

Input schema

{
  "type": "object",
  "required": [
    "driverTeeth",
    "drivenTeeth"
  ],
  "properties": {
    "driverTeeth": {
      "type": "number",
      "description": "input gear teeth",
      "examples": [
        12
      ]
    },
    "drivenTeeth": {
      "type": "number",
      "description": "output gear teeth",
      "examples": [
        36
      ]
    },
    "inputRpm": {
      "type": "number",
      "examples": [
        3000
      ]
    },
    "inputTorqueNm": {
      "type": "number",
      "examples": [
        10
      ]
    }
  }
}

Output schema

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