Plan, check and brief every flight in one place
Flight plans, live weather, crew duty limits and NOTAM checks for pilots, dispatchers, students and hobbyists. Free, fast, and no sign-up.
Flight Planner
Route, fuel, load sheet and an ICAO flight plan you can download as PDF.
Plan a flightMETAR and TAF
Live airport weather and forecasts, decoded into plain English.
Check weatherCrew Duty Limits
FAA Part 117 flight and duty limits for 2, 3 and 4 pilot crews.
Check limitsNOTAM Decoder
Decode a NOTAM, see the area on a map and check your route.
Decode a NOTAMLoad Sheet and Trim
Weights, CG envelope graph and trim setting on a printable load sheet.
Build a load sheetEDTO Flight Planner
Circles, route validation, equal time points and live weather.
Plan EDTOTry it live: the wind triangle
Drag the sliders to see the heading to fly, ground speed and wind correction angle update instantly.
Heading to fly
Ground speed
Correction
Heading Wind Track over ground
All tools
Crosswind & Headwind CalculatorFree crosswind and headwind component calculator.Pilots, StudentsWind Triangle CalculatorFree wind triangle calculator for pilots.Students, Pilots, HobbyistsFlight Fuel Planning CalculatorFree flight fuel planning calculator: trip, contingency, alternate, final reserve and block fuel from distance, speed and burn rate.Dispatchers, PilotsDensity Altitude CalculatorFree density altitude calculator.Pilots, Engineers, StudentsGreat-Circle Distance & Course CalculatorFree great-circle distance calculator.Dispatchers, Engineers, HobbyistsTop of Descent CalculatorFree top of descent calculator using the 3:1 rule.Pilots, StudentsMach and True Airspeed CalculatorFree Mach to true airspeed calculator.Pilots, Students, Engineers, HobbyistsEqual Time Point (ETP) CalculatorFree equal time point calculator.Pilots, Dispatchers, StudentsNAT Track Message Number (TMI) CalculatorFree NAT TMI calculator.Pilots, Dispatchers, StudentsMETAR DecoderRead any METAR in plain English with flight category.Pilots, Students, Dispatchers, HobbyistsNOTAM Decoder and Route CheckDecode a NOTAM, map the area and check your route.Pilots, Dispatchers, StudentsCrew Duty Limits (FAA Part 117)Flight time, FDP, augmented crews and rest.Pilots, Dispatchers, StudentsLoad Sheet, CG Envelope and TrimWeights, balance, envelope graph and trim.Pilots, Dispatchers, Students, EngineersAviation Unit ConverterSpeed, distance, pressure, weight, fuel and temperature.EveryoneEDTO Flight PlannerCircles, coverage, ETPs and weather on a map.Pilots, Dispatchers, Students
Learning paths
EDTO from scratchWhy EDTO exists, how it is approved, how diversion circles and equal time points work, and polar routes.Learning pathOceanic and North Atlantic flyingOrganised tracks, the TMI number, NAT high level airspace, clearances and contingencies.Learning path
Guides
How to Calculate Crosswind and Headwind ComponentsLearn the crosswind formula, a quick mental method and a worked example, plus why METAR wind needs a magnetic correction.GuideHow to Read a METAR: A Plain-English GuideDecode every group in a METAR: wind, visibility, weather, cloud, temperature, pressure and flight category, with a worked example.GuideHow to Read a TAF: Airport Forecasts ExplainedUnderstand TAF validity times and the FM, BECMG, TEMPO and PROB change groups, with a decoded example and planning tips.GuideWhat Is in an ICAO Flight Plan? Every Item ExplainedA line-by-line guide to the ICAO flight plan (FPL): items 7 to 19, with a worked example you can generate yourself.GuideThe Wind Triangle Explained: Heading, Ground Speed and DriftHow the wind triangle works: wind correction angle, true heading and ground speed, with formulas and a worked example.GuideFAA Part 117 Explained: Flight Time, Duty Period and RestA plain-English guide to FAA Part 117: flight time limits, flight duty period tables, augmented crews, rest facility classes and rest rules.GuideFlight Fuel Planning Explained: Trip, Contingency, Alternate and ReserveUnderstand the parts of block fuel: taxi, trip, contingency, alternate and final reserve, with a worked example you can check in the calculator.GuideDensity Altitude Explained: How Heat and Height Cut PerformanceWhat density altitude is, how to calculate it from pressure altitude and temperature, and why it lengthens takeoffs and reduces climb.GuideHow to File a Flight Plan: Steps for Pilots and DispatchersThe steps from planning to filing an ICAO flight plan, what happens after filing, and the delay and cancellation messages.GuideHow to Read a NOTAM: ICAO Format ExplainedA guide to the ICAO NOTAM format: the Q-line, the A to G fields, validity times and a decoded example.GuideEASA Flight Time Limitations: The Basics and How They Differ from FAA Part 117An overview of EASA flight and duty time limits (ORO.FTL): daily FDP by sectors, extensions, cumulative limits, and how they compare with FAA Part 117.GuideEDTO Explained: Extended Diversion Time Operations from ScratchWhat EDTO is, why it exists, how diversion time is calculated, what threshold time and maximum diversion time mean, and what an operator must plan.GuideAdequate vs Suitable Aerodrome: What Is the Difference?Adequate and suitable aerodromes explained: how they differ, why the difference matters for alternates and EDTO planning, and what changes with the time of use.GuideHow to Calculate an Equal Time Point (ETP)Learn what an equal time point is, the formula, how wind moves it, and a worked example you can check in the calculator.GuideEDTO Approval and Dispatch Requirements ExplainedHow operators get EDTO approval, the approval levels and the dispatch checks before every EDTO flight, based on ICAO guidance and national circulars.GuideThe North Atlantic Organised Track System (NAT OTS) ExplainedWhat the NAT OTS is, how the tracks are built and published, the lateral spacing, and where the tracks sit in the high level airspace.GuideThe NAT Track Message and TMI Number ExplainedWhat is in a NAT Track Message, what the three-digit TMI number means, how re-issues are labelled, and how the TMI is used in clearances.GuideNAT High Level Airspace (HLA) Requirements ExplainedThe NAT HLA vertical limits, the approvals and equipment needed to enter it, RVSM and datalink requirements, and what non-approved aircraft can do.GuideOceanic Clearance on the North Atlantic: How It WorksHow to obtain an oceanic clearance for the North Atlantic, what a clearance contains, the abbreviated readback with the TMI, and common errors.GuideNAT Contingency Procedures and SLOP ExplainedWhat to do over the North Atlantic when a clearance cannot be obtained, and how strategic lateral offsets work, based on ICAO bulletins and SKYbrary.GuidePolar Routes Explained: What Is Special About Flying Near the PolesWhat counts as a polar area, why polar routes are used, and the fuel, communication, diversion and radiation issues that make them special.GuidePolar Operations Requirements Checklist (FAA)The items an operator must include to be authorised to fly in the North Polar Area under FAA rules: diversion airports, recovery plan, fuel freeze, communications, MEL, training, radiation plan and cold weather suits.Guide
Why trust the numbers
Formulas on the page. Each calculator explains its maths so you can check it.
Private by design. Calculators run in your browser. Nothing you type is sent anywhere.
Honest limits. These are planning aids. Approved aircraft data, weather and NOTAMs always come first.
FAQ
Are these tools free?
Yes. Every tool is free and needs no account.
Can I use them for real flights?
They are training and reference aids. Use approved aircraft data, official weather and NOTAMs for operational decisions.