Experimental tools to help with flight planning calculations. Use as a reference alongside official sources and your aircraft's POH - not as your primary planning tool.
Flight Planning
Leg Planner
Complete flight leg planning with course, fuel consumption, waypoints, and time estimates. Perfect for VFR navigation
Course Calculator
Calculate wind correction angle, ground speed, and compass heading. Simple and focused on basic course calculations
Route Calculator
Calculate distance, true bearing, magnetic heading, and variation using WGS-84 geodesic algorithms for high-precision navigation
Time & Fuel Calculator
Calculate time, speed, distance and fuel consumption. Solve any flight planning problem by entering two known values
Local Chart
Create printable route charts with fixed UTM scale for short-range local flights. Measure distances with ruler like a real aeronautical chart
Airport Conditions
View current weather, runway information, and aerodrome details. Search by ICAO code or airport name
Aircraft Performance
Climb Calculator
Calculate climb time, distance, fuel consumption, and Top of Climb position based on aircraft performance and density altitude
V-Stall Calculator
Calculate stall speed (IAS and TAS) adjusted for weight, bank angle, flap configuration, and density altitude. Essential for safety margins
Takeoff Performance
Calculate ground roll, obstacle clearance distance, and GO/NO-GO decision based on runway length, surface, weight, altitude, and temperature
Utilities
Unit Converter
Convert aviation units including distances, speeds, fuel volumes, temperatures, weight, and pressure. Inspired by the Jeppesen CR-3
TAS Calculator
Calculate True Airspeed from Calibrated Airspeed, Outside Air Temperature, and Pressure Altitude using the ISA model
ISA Calculator
Calculate ISA Temperature, Pressure Altitude, and Density Altitude from elevation, QNH, and actual temperature
Educational
About These Aviation Tools
These aviation tools are designed to help pilots with essential flight planning calculations. Whether you are preparing for a VFR cross-country flight or studying for your pilot license, these calculators cover the core navigation and performance calculations every pilot needs to understand.
Flight planning involves determining the route, calculating headings and ground speed based on wind, estimating fuel consumption, and ensuring safe aircraft performance. These tools automate those calculations while showing you the underlying formulas, so you can verify results and deepen your understanding of aviation navigation principles.
All distance and bearing calculations use the WGS-84 geodesic model for maximum accuracy. Performance calculations follow the ISA (International Standard Atmosphere) model. The tools work entirely offline once loaded, making them reliable for preflight planning anywhere.
How Flight Planning Works
Flight planning is a systematic process that ensures safe and efficient navigation from departure to destination. Every VFR pilot learns to calculate courses, correct for wind, estimate fuel requirements, and verify aircraft performance before takeoff.
Course and Heading Calculations
The foundation of flight planning starts with determining the true course between two points. This involves measuring the angle from true north to the intended track. Pilots then apply magnetic variation to convert true course to magnetic course, and finally apply wind correction angle (WCA) to determine the heading to fly. The wind correction angle compensates for crosswind drift, ensuring the aircraft tracks the desired ground path despite wind displacement.
Ground Speed and Time Estimates
Wind affects not only heading but also ground speed. A headwind component reduces ground speed below true airspeed, while a tailwind increases it. Accurate ground speed calculation is essential for estimating time en route (ETE) and fuel consumption. The flight planning tools here calculate these values using vector trigonometry, the same method taught in navigation courses worldwide.
Fuel Planning and Reserves
Safe flight planning requires careful fuel calculation. Pilots must account for taxi fuel, climb fuel, cruise fuel consumption, descent, approach, and mandatory reserves. These aviation tools help calculate fuel requirements based on flight time and fuel flow rate, though pilots should always cross-reference with their aircraft POH (Pilot Operating Handbook) for accurate fuel consumption figures at different power settings and altitudes.
Aircraft Performance Calculations
Beyond navigation, flight planning includes performance verification. Takeoff distance, climb performance, and stall speeds all vary with density altitude, aircraft weight, and configuration. The performance calculators here help estimate these values, but remember that actual performance depends on many factors including runway surface, slope, and pilot technique.
Technical Standards Used
WGS-84 Geodesic Model
All distance and bearing calculations use the WGS-84 (World Geodetic System 1984) ellipsoid model. This is the same reference system used by GPS and modern aviation navigation systems. Unlike simple spherical calculations, WGS-84 accounts for Earth's true shape as an oblate spheroid, providing accuracy within meters for geodesic distance calculations anywhere on the planet.
ISA Standard Atmosphere
Performance calculations use the International Standard Atmosphere (ISA) model. ISA defines standard conditions at sea level as 15°C temperature and 1013.25 hPa pressure, with temperature decreasing at 1.98°C per 1000 feet in the troposphere. This standard allows pilots to calculate density altitude and predict aircraft performance under non-standard conditions by comparing actual conditions to ISA values.
Magnetic Variation
The tools use the World Magnetic Model (WMM) to calculate magnetic variation at any location. Magnetic variation (also called declination) is the angle between true north and magnetic north, which varies by location and changes slowly over time. Accurate magnetic variation is essential for converting between true and magnetic courses in flight planning.
Why I Built This
This project began as a study aid during my PPL training (2025). While studying navigation, aerodynamics performance and meteorology, I found that implementing the calculations myself was the best way to really understand the material.
The goal is to keep the math open and auditable. Unlike official flight planning tools which often hide the formula logic, this app is designed to let you see exactly how the results are derived. You should be able to cross-check everything here by hand using the same formulas taught in aviation ground school.
Disclaimer: These aviation tools are for educational use only. Always rely on official sources (POH, charts, certified flight planning software) for actual flight planning and navigation.
The project is open source and completely free (no ads/tracking). If you spot an error or have ideas on how to improve it, feel free to reach out or open a PR.