# AviationCalcs — llms.txt
# https://aviationcalcs.com

> AviationCalcs is a free, browser-based suite of aviation and aerospace engineering calculators. No signup, no ads, no tracking. All calculations run client-side.

## What it does

AviationCalcs provides 25+ precision calculators for PPL student pilots and aerospace engineering students:

- METAR/TAF Decoder: parses ICAO aviation weather reports into plain English
- SIGMET Decoder: decodes significant meteorological information (WS, WV, WC formats)
- Cloud Base Estimator: estimates cloud base height from temperature/dew point spread
- Density Altitude Calculator: computes density altitude from QNH, pressure altitude and OAT
- ISA Atmosphere: standard temperature, pressure and density at any altitude (ICAO 1993)
- Wind Correction Angle (WCA): calculates heading to fly and ground speed from wind and TAS
- Great Circle Distance: shortest path and bearing between two airports
- Holding Pattern Entry: determines Direct, Parallel or Teardrop entry per ICAO standard
- IAS ↔ TAS Converter: converts between indicated and true airspeed
- Takeoff & Landing Distance (TOLD): estimates performance from POH data
- Fuel Requirements: EASA/ICAO fuel calculation (trip, alternate, contingency, final reserve)
- Mach Number Calculator: Mach, TAS and EAS from CAS and pressure altitude
- Reynolds Number: flow regime characterisation for aerodynamic analysis
- Lift & Drag Calculator: forces from aerodynamic coefficients
- Stall Speed Calculator: Vs for any configuration and load factor
- Hohmann Transfer Orbit: delta-v for orbital transfers
- Vis-Viva Equation: orbital parameters from semi-major axis and eccentricity
- Multi-Stage Rocket Staging: optimum staging for multi-stage rockets
- Tsiolkovsky Rocket Equation: delta-v, propellant mass and mass ratio
- Specific Impulse (Isp): engine efficiency and thrust calculations
- Breguet Range Equation: maximum aircraft range from L/D, SFC and fuel fraction
- Load Factor & G-Force: structural load analysis and V-n diagram
- Alternate Airport Finder: airports within a given radius
- Pre-flight Briefing Generator: structured go/no-go briefing

## Audience

PPL student pilots, licensed private pilots, aerospace engineering students, flight instructors.

## License

Free to use for personal and educational purposes.

## Contact

contact@aviationcalcs.com