E6B Flight Computer + W&B vs Crabwise

E6B combines a flight computer with aircraft weight and balance tools for training and flight planning. FIND YOUR CALCULATOR Search by calculator name, category or input such as TAS. Tap the star beside a calculator to keep it in Favorites. FREE CALCULATORS • Time, speed and distance • Fuel required for a leg, including reserve • Unit conversions for distance, speed, pressure, temperature and fuel weight PRO — ONE-TIME PURCHASE • Weight and balance with saved aircraft profiles, editable stations, a center-of-gravity envelope, takeoff and landing loads, and PDF export • Pressure, density and cold-corrected altitude • Calibrated and true airspeed, equivalent airspeed, Mach and speed of sound • Wind triangle, unknown wind, crosswind and headwind, heading corrections and off-course correction • Endurance, range, descent, climb, glide, holding entry, turn rate and radius • Performance interpolation, cloud base and freezing level BUILT FOR CLEAR INPUT Enter decimals and negative values with the dedicated calculation keypad. Choose units such as hPa, inHg, feet, metres, kilograms, pounds, litres and gallons. Units appear beside values, and shared inputs carry between relevant calculators. On a wide iPad screen, view results beside the input fields and keypad. Your current input stays intact when the layout changes. Result cards explain the calculation and show its source. Calculations work offline. Purchasing and restoring Pro require a store connection. There are no advertisements or subscriptions. One purchase unlocks the Pro calculators. This app is a training and planning aid. Check your aircraft's POH/AFM and official sources before making flight decisions.

Crabwise is an offline E6B flight computer built for student and private pilots: the six calculations you learn on paper, with type large enough to read at a glance. WIND & GROUND SPEED Solve the wind triangle both directions: find your heading and ground speed, or work backward from heading, track, and ground speed to find the wind. PRESSURE & DENSITY ALTITUDE See the classroom rule of thumb and the exact ICAO Doc 7488 answer side by side, so you know how much margin you actually have. TRUE AIRSPEED & MACH The quick 2%-per-1000-ft approximation and the exact compressible calculation, together. FUEL / TIME / DISTANCE Solve for any one of the three from the other two. CROSSWIND Headwind and crosswind components for any runway and wind. CONVERSIONS Seven unit families: distance, speed, altitude, temperature, pressure, weight, volume. CRABWISE PRO, ONE-TIME PURCHASE ($9.99) - Aircraft profiles: save cruise speed, fuel burn, usable fuel, empty weight and arm, and limits for every aircraft you fly. - Leg planner: chain legs from true course to compass heading, with running totals for time and fuel. - Weight & balance: plot your loading against your aircraft's envelope, checked live as you type. - History & export: save any result and export it as text or CSV. Free forever: all six calculators, every unit, every language, extra-large type. No ads, ever. No trial timer, no subscription. For training and planning cross-checks. Always verify against your aircraft flight manual and official sources. Not for primary navigation. No account. No ads. No tracking. Works offline. Available in English, Spanish, and Polish.