# Aviation Calculators – True Airspeed, Mach & Equivalent Airspeed

> Aviation Calculators – True Airspeed, Mach & Equivalent Airspeed is a paid API for AI agents from aviation-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).

Calculates true airspeed (TAS), Mach number, and equivalent airspeed (EAS) from calibrated airspeed, pressure altitude, and outside air temperature.

## Facts

- Endpoint: GET https://aviation-calc.x402tookit.com/true-airspeed?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aviation-calculators-true-airspeed-mach-equivalent-airspeed-a0871f75
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Xxt0EJBqtDq1CzjOe4mJe

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability aviation-calculators-true-airspeed-mach-equivalent-airspeed-a0871f75
```

Example prompt: What's my true airspeed and Mach number if my calibrated airspeed is 280 knots, I'm at a pressure altitude of 35000 feet, and the outside air temperature is -52°C?

## When to prefer this

Choose this endpoint when you need a precise, multi-output airspeed conversion including TAS, Mach, EAS, density ratio, and speed of sound in a single call, especially for flight planning, performance calculations, or educational use. It supports ISA deviation and optional real OAT input, making it more complete than a simple rule-of-thumb TAS calculator.

## Known failure modes

- Missing required casKt or pressureAltitudeFt returns a validation error
- CAS outside range 20–600 knots may return an error or degraded result
- Pressure altitude outside -1500 to 65000 ft range may return an error
- Extreme or physically implausible OAT values may yield degraded results or null outputs
- Network or payment (x402) failures return HTTP 402 or 5xx

## How this service works

True airspeed, Mach and equivalent airspeed from calibrated airspeed, pressure altitude and outside air temperature.

## Output

Returns a JSON object containing true airspeed (tasKt), Mach number, equivalent airspeed (equivalentAirspeedKt), calibrated airspeed echo (casKt), pressure altitude (pressureAltitudeFt), static temperature (temperatureC), density ratio, speed of sound (speedOfSoundKt), TAS minus CAS delta (tasMinusCasKt), a rule-of-thumb TAS estimate (ruleOfThumbTasKt), and metadata fields including summary, verdict, disclaimer, and degraded status.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "casKt",
      "pressureAltitudeFt"
     ],
     "properties": {
      "oatC": {
       "type": "number",
       "description": "Outside (static) air temperature in C; defaults to ISA at that altitude"
      },
      "casKt": {
       "type": "number",
       "description": "Calibrated airspeed in knots (indicated corrected for instrument and position error), 20 to 600"
      },
      "pressureAltitudeFt": {
       "type": "number",
       "description": "Pressure altitude in feet, -1500 to 65000"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "mach": {
       "type": [
        "null",
        "number"
       ]
      },
      "casKt": {
       "type": [
        "null",
        "number"
       ]
      },
      "tasKt": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "densityRatio": {
       "type": [
        "null",
        "number"
       ]
      },
      "temperatureC": {
       "type": [
        "null",
        "number"
       ]
      },
      "tasMinusCasKt": {
       "type": [
        "null"
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aviation-calculators-true-airspeed-mach-equivalent-airspeed-a0871f75/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from aviation-calc.x402tookit.com](https://www.zero.xyz/host/aviation-calc.x402tookit.com/llms.txt)