Critical ratio (CR = SPI × CPI) API

Compute the schedule-and-cost critical ratio CR = SPI × CPI = (EV/PV)·(EV/AC) — a single combined control index — with a zone bucket (critical/caution/healthy/acceptable/review-estimates). Answers 'what is my critical ratio','combined cost and schedule health','is this project in the danger zone'.

Price$0.01per request

MethodPOST

Route/v1/calc/pm-critical-ratio

StatusLive

MIME typeapplication/json

Rate limit120/minute

CacheNo cache

calcpmcritical-ratioevmspicpicontrolproject

API URLhttps://x402.hexl.dev/v1/calc/pm-critical-ratio

Integration docs

Example request

{
  "earnedValue": 800,
  "plannedValue": 1000,
  "actualCost": 1000
}

Example response

{
  "earnedValue": 800,
  "plannedValue": 1000,
  "actualCost": 1000,
  "spi": 0.8,
  "cpi": 0.8,
  "criticalRatio": 0.64,
  "zone": "critical",
  "formula": "CR = SPI × CPI = (EV/PV) × (EV/AC)"
}

Input schema

{
  "type": "object",
  "required": [
    "earnedValue",
    "plannedValue",
    "actualCost"
  ],
  "properties": {
    "earnedValue": {
      "type": "number",
      "examples": [
        800
      ]
    },
    "plannedValue": {
      "type": "number",
      "examples": [
        1000
      ]
    },
    "actualCost": {
      "type": "number",
      "examples": [
        1000
      ]
    }
  }
}

Output schema

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