# Aviation Calculators

Pilot math from your own numbers: pressure and density altitude, ISA, true airspeed, wind components, wind triangle, fuel and time, glide and turns.

## How to pay

Machine-payable over x402. USDC on: Base (eip155:8453), Solana (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp), Polygon (eip155:137), Arbitrum One (eip155:42161).
No accounts. No API keys. No signup. The paying wallet is the account.

## Machine-readable

- OpenAPI: https://aviation-calc.x402tookit.com/openapi.json
- x402 manifest: https://aviation-calc.x402tookit.com/.well-known/x402
- Catalog (free): https://aviation-calc.x402tookit.com/catalog
- Health (free): https://aviation-calc.x402tookit.com/health
- Uptime (free): https://aviation-calc.x402tookit.com/uptime

## Endpoints (9)

### GET /density-altitude — $0.02
Density altitude from field elevation, altimeter setting and temperature, exact and by rule of thumb, with a performance flag.
Params: elevationFt: number, altimeter: number, oatC: number, unit?: string
Example: https://aviation-calc.x402tookit.com/density-altitude?elevationFt=5000&altimeter=29.92&oatC=30&unit=inhg

### GET /fuel-time-distance — $0.02
E6B arithmetic: give any two of distance, groundspeed and time for the third, plus fuel burn, reserve and range.
Params: distanceNm?: number, groundspeedKt?: number, timeMin?: number, fuelFlowPerHour?: number, fuelOnBoard?: number, reserveMin?: number
Example: https://aviation-calc.x402tookit.com/fuel-time-distance?distanceNm=150&groundspeedKt=120&fuelFlowPerHour=8&fuelOnBoard=30&reserveMin=45

### GET /glide-ratio — $0.02
Glide distance, time and sink rate from altitude above ground, glide ratio and best-glide speed, with headwind or tailwind.
Params: altitudeAglFt: number, glideRatio: number, glideSpeedKt?: number, headwindKt?: number
Example: https://aviation-calc.x402tookit.com/glide-ratio?altitudeAglFt=5000&glideRatio=9&glideSpeedKt=65&headwindKt=20

### GET /isa-atmosphere — $0.02
Standard atmosphere at an altitude: temperature, pressure, density, sound speed, and ISA deviation for a measured temperature.
Params: altitudeFt: number, oatC?: number
Example: https://aviation-calc.x402tookit.com/isa-atmosphere?altitudeFt=10000&oatC=5

### GET /pressure-altitude — $0.02
Pressure altitude from field elevation and altimeter setting (inHg or hPa), exact ISA result and the 1000 ft per inHg rule.
Params: elevationFt: number, altimeter: number, unit?: string
Example: https://aviation-calc.x402tookit.com/pressure-altitude?elevationFt=5000&altimeter=29.42&unit=inhg

### GET /true-airspeed — $0.02
True airspeed, Mach and equivalent airspeed from calibrated airspeed, pressure altitude and outside air temperature.
Params: casKt: number, pressureAltitudeFt: number, oatC?: number
Example: https://aviation-calc.x402tookit.com/true-airspeed?casKt=150&pressureAltitudeFt=10000&oatC=-5

### GET /turn-hold — $0.02
Turn rate, radius, bank angle and load factor from true airspeed, plus holding pattern leg length, width and time.
Params: tasKt: number, bankDeg?: number, rateDegPerSec?: number, altitudeFt?: number
Example: https://aviation-calc.x402tookit.com/turn-hold?tasKt=120&rateDegPerSec=3&altitudeFt=5000

### GET /wind-components — $0.02
Headwind or tailwind and crosswind (left or right) from wind direction and speed against a runway number or heading, with gusts.
Params: windFromDeg: number, windKt: number, runway?: string, headingDeg?: number, gustKt?: number, crosswindLimitKt?: number
Example: https://aviation-calc.x402tookit.com/wind-components?windFromDeg=240&windKt=18&runway=27&gustKt=26&crosswindLimitKt=15

### GET /wind-triangle — $0.02
E6B wind triangle: wind correction angle, heading and groundspeed for a course, or track and groundspeed for a heading flown.
Params: tasKt: number, windFromDeg: number, windKt: number, courseDeg?: number, headingDeg?: number, magneticVariationDeg?: number
Example: https://aviation-calc.x402tookit.com/wind-triangle?tasKt=120&windFromDeg=180&windKt=30&courseDeg=90&magneticVariationDeg=-8

## Terms

Flight-planning calculators using the ICAO standard atmosphere and standard E6B formulas on the numbers you enter, provided as is. They are study and planning aids, not a substitute for the aircraft flight manual, approved performance data, current weather, NOTAMs or a flight instructor. Never base a go or no-go decision on this alone.