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Flight Computer

Free online tool from PilotMall

E6B Flight Computer

The classic E6B a private pilot reaches for, now free and online. Works on any device, even offline.

The PilotMall E6B Flight Computer is a free online version of the classic E6B that private pilots use for VFR flight planning. Run it in any browser on your phone, tablet, or laptop, with no app to install and no sign in. It performs the same core calculations as a handheld electronic E6B, from density altitude and true airspeed to the wind triangle, weight and balance, and unit conversions. Planning a full cross-country flight? Use the free VFR Navigation Log to build your route leg by leg.

Flight Computer (Free Online E6B) | PilotMall.com

°C°F

Choose a function

Altitude & Air Data Density Altitude & TAS Pressure altitude, density altitude, true airspeedAltitude & Air Data True Altitude Altitude corrected for non-standard temperatureWind Wind Correction Heading, ground speed and WCA for your courseWind Find Winds Aloft Actual wind from heading, track and speedsWind Crosswind Component Crosswind and head/tailwind on a runwayNavigation Time / Speed / Distance Fill any two, get the third, plus ETANavigation True / Magnetic / Compass Apply variation and deviationClimb & Descent Required Rate of Climb Rate needed to gain altitude over a distanceClimb & Descent Top of Descent Where to start down, plus descent gradientClimb & Descent Glide Range How far you can glide from altitudeFuel Fuel & Endurance Burn, time, quantity and fuel weightWeather Cloud Base Convective cloud base from temp and dewpointWeather Standard (ISA) Temp ISA temperature and deviation at altitudeWeight & Balance Weight & Balance Loading, total weight, CG and limits checkConversions Unit Conversions Distance, speed, fuel, weight, pressure, temp, time

‹ Menu

Density Altitude & True Airspeed

Enter what you read in the cockpit. Pressure altitude, density altitude, ISA deviation and TAS compute live.

Inputs

Indicated / field altitude

Altimeter setting

inHg

Outside air temp (OAT)

°C

ISA temp here: 4 °C

Calibrated airspeed (CAS/IAS)

Readout

Pressure altitude5,500ft

Density altitude7,321ftwatch

True airspeed134kt

ISA temp deviation+16°C

How: Pressure altitude = indicated + (29.92 - altimeter) x 1000. Density altitude and TAS come from the ISA density at that pressure altitude and your OAT (TAS = CAS / sqrt of density ratio).

‹ Menu

True Altitude

Your altimeter over-reads in cold air. This corrects indicated altitude for non-standard temperature (the standard 4 ft per 1000 ft per degree rule). Important for terrain and obstacle clearance in winter.

Inputs

Indicated altitude

Reporting station elevation

Field elevation of the altimeter source.

Outside air temp (OAT)

°C

Readout

True altitude7,604ft

Correction-396ftbelow indicated

ISA deviation-14°C

‹ Menu

Wind Correction

Solve heading and ground speed for a planned course and forecast wind. Angles are degrees true.

Inputs

True course

°T

True airspeed

Wind from

°T

Wind speed

Readout

True heading83°T

Ground speed105kt

Wind correction angle-6.8° L

Head / tail component-14 HWkt

Crosswind component14 Lkt

‹ Menu

Find Winds Aloft

Work out the actual wind in flight from your heading, TAS, track (course over the ground) and ground speed.

Inputs

True heading (flown)

°T

True airspeed

Track / course over ground

°T

Ground speed

Readout

Wind from44°T

Wind speed20kt

‹ Menu

Runway Crosswind

Crosswind and head/tailwind components for a runway and the reported wind.

Inputs

Runway heading

Runway 27 = 270 degrees.

Wind from

Wind speed

Readout

Crosswind12ktfrom right

Headwind14kt

Wind angle to runway40°

‹ Menu

Time / Speed / Distance

Fill any two of the three; the third is computed. Add a departure time for an ETA.

Values

Ground speed

Time en route

min

Distance

Departure time (optional)

clock

Solved

Distance60NM

Time (h:mm)0:30

Estimated arrival-

‹ Menu

True / Magnetic / Compass Heading

Convert a true heading to magnetic and compass using local variation and the aircraft's deviation card. East is least, west is best.

Inputs

True heading

°T

Variation

°EW

Deviation

°EW

Readout

Magnetic heading80°M

Compass heading82°C

‹ Menu

Required Rate of Climb

The climb rate you need to gain a given altitude within a given distance, for example to clear terrain or an obstacle.

Inputs

Altitude to gain

Distance available

Ground speed

Readout

Required climb rate300fpm

Gradient200ft/NM

Gradient3.3%

‹ Menu

Top of Descent

Where to start down for a planned descent rate, and the resulting gradient.

Inputs

Altitude to lose

Descent rate

fpm

Ground speed

Readout

Start descent12.0NM out

Descent takes6.0min

Gradient250ft/NM

‹ Menu

Glide Range

How far you can glide from a given height at your aircraft's best glide ratio. Distance is still air, no wind.

Inputs

Glide ratio (distance : drop)

: 1

Cessna 172 is about 9:1.

Height above ground

Readout

Glide distance7.4NM

Also8.5SM

‹ Menu

Fuel & Endurance

Fill any two of burn rate, time and quantity; the third is computed. Fuel weight shown for weight and balance.

Values

Fuel burn

gph

Time (endurance)

min

Fuel quantity

gal

Fuel type

Avgas 100LL (6.0 lb/gal)Jet-A (6.7 lb/gal)

Solved

Quantity15.0gal

Fuel weight90lb

‹ Menu

Estimated Cloud Base

Convective cloud base above the surface from the temperature / dewpoint spread (about 2.5 degrees per 1000 ft).

Inputs

Surface temperature

°C

Dewpoint

°C

Readout

Cloud base5,600ft AGL

Spread14.0°C

A planning estimate for cumulus bases. Not a substitute for a current METAR, TAF or PIREP.

‹ Menu

Standard (ISA) Temperature

The standard-atmosphere temperature at an altitude, and how far the actual temperature deviates from it.

Inputs

Altitude

Actual OAT (optional)

°C

Readout

ISA temperature-1°C

Deviation from ISA+1°C

‹ Menu

Weight & Balance

Enter each station's weight and arm. Total weight, moment and center of gravity update live, with a limits check. Example values are a typical Cessna 172.

Station	Weight (lb)	Arm (in)	Moment
Empty aircraft			58,500
Front seats			12,580
Rear seats			0
Baggage			1,900
Fuel (gal)			11,520
Total	2,100	40.2	84,500

Limits (optional)

Max gross weight

Forward CG limit

Aft CG limit

Status

Center of gravity40.24in

Weight2,100lbok

CG within limitswithin limits

Fuel row: enter fuel in gallons; it is converted to weight automatically (avgas 6.0 lb/gal). Always confirm against your aircraft's POH.

‹ Menu

Unit Conversions

Enter a value in any unit; the equivalents update live.

DistanceSpeedAltitudeVolumeFuel AvgasFuel Jet AWeightPressureTemperatureTime

Value

NMSMkmmft

115.08

185.20

185,200

607,612

Prefer to hold one in your hand?

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How to use this E6B flight computer

Choose a function from the menu: altitude and air data, wind, navigation, climb and descent, fuel, weather, weight and balance, or unit conversions.
Enter what you know. Results update as you type, so there is no calculate button to press.
Set your temperature unit with the °C and °F toggle at the top of the tool. It starts in Celsius.
Tap Menu (or press Esc) to go back and pick the next calculation.
Plan a cross-country in order: wind correction for heading and ground speed, then time, speed and distance using that ground speed, then fuel and endurance, then weight and balance with the fuel weight it gives you.

Example, density altitude on a hot day: open Density Altitude & TAS and enter a field elevation of 5,000 feet, an altimeter setting of 29.92 and an outside air temperature of 30 °C (86 °F). Density altitude reads 7,801 feet, so the airplane will perform as if the field were about 2,800 feet higher. Add a calibrated airspeed of 100 knots and true airspeed reads 112 knots.

Prefer a flight computer you can hold? The ASA E6B Paper Flight Computer is the classic choice for ground school and the checkride, the ASA Premium Aluminum E6B is built to last for years in a flight bag, the ASA Color E6B is designed for easier reading, and the ASA CX-3 electronic flight computer can be used on FAA knowledge exams.

What this flight computer calculates

Density altitude and pressure altitude
True airspeed (TAS)
True altitude (cold-temperature correction)
Wind correction angle, heading, and ground speed
Winds aloft from heading and track
Crosswind and headwind components
Time, speed, and distance with ETA
True, magnetic, and compass heading
Required rate of climb
Top of descent
Glide range
Fuel burn, endurance, and fuel weight
Weight and balance with CG limits
Cloud base and standard (ISA) temperature
Unit conversions (distance, speed, volume, fuel, weight, pressure, temperature, time)

Frequently asked questions

Is the PilotMall E6B flight computer free?

Yes. It is completely free to use, with no account and no download. It runs in any modern web browser on a phone, tablet, or computer.

Does it work offline?

Once the page has finished loading, the calculations run entirely in your browser, so they keep working even if you lose your connection, for example in a run-up area or a hangar with no wifi.

How accurate is it?

It uses the International Standard Atmosphere and the standard E6B methods, and its results match dedicated handheld flight computers. It is intended for flight planning and training. Always cross-check your approved aircraft data, current weather, and official charts. It is not an approved source of performance data.

What can it calculate?

Density altitude, true airspeed, true altitude, the full wind triangle, crosswind components, time, speed, and distance, headings, climb and descent, glide range, fuel and endurance, weight and balance, cloud base, and unit conversions.

Do I still need a physical E6B for my checkride?

Usually yes. Many knowledge tests and practical exams expect a manual E6B or an approved electronic flight computer, and some testing centers do not allow phones. A dedicated E6B is also more durable in the cockpit.

Which flight computer should I buy?

For training and checkrides, a manual E6B is the standard choice. For fast, button-driven answers, an electronic flight computer is popular, and a rotating plotter pairs well for chart work. Browse the current lineup below.

Shop flight computers and plotters

E6B Flight Computer glossary

Key terms behind what this flight computer calculates.

International Standard Atmosphere (ISA)A reference model of the atmosphere assuming a sea-level temperature of 15 degrees C and pressure of 29.92 inHg, with temperature falling about 2 degrees C per 1,000 feet, and it is the baseline every E6B altitude and airspeed correction is measured against.

Pressure Altitude (PA)Your altitude above the standard 29.92 inHg datum, found by setting the altimeter to 29.92, and it is the starting input for density altitude and true airspeed because aircraft performance follows air pressure, not the local altimeter setting.

Density Altitude (DA)Pressure altitude corrected for nonstandard temperature, that is, the altitude at which the airplane performs as if it were flying, and high density altitude on a hot day cuts engine power, propeller thrust, and lift, which lengthens the takeoff roll and flattens the climb rate.

Calibrated Airspeed (CAS)Indicated airspeed corrected for instrument and static-port (position) error, and it is the airspeed you enter into the E6B to solve for true airspeed.

True Airspeed (TAS)Your actual speed through the air mass, found from calibrated airspeed corrected for pressure altitude and temperature, and because air thins with altitude your TAS normally runs faster than indicated, so it is the speed used for time, fuel, and wind calculations.

True AltitudeYour actual height above mean sea level, which differs from indicated altitude in nonstandard temperatures, and in very cold air the airplane is lower than the altimeter shows (cold-temperature error), a real hazard on instrument approaches near terrain.

Winds AloftThe forecast wind direction (in degrees true) and speed at your cruising altitudes, and they are the key input to the wind triangle that determines how far the wind pushes you off course and how it changes your speed over the ground.

Wind TriangleThe vector diagram that combines your true airspeed and heading with the wind to solve for ground track and ground speed, and it is the core math behind every heading and time en route the E6B produces for a cross-country.

Wind Correction Angle (WCA)The number of degrees you turn into the wind so the airplane tracks your intended course instead of drifting downwind, and it is applied to true course to produce true heading.

Ground Speed (GS)Your actual speed over the ground after wind is applied to true airspeed, and it is what determines your time en route and fuel required, since a headwind can turn a comfortable reserve into a fuel stop.

Headwind and Crosswind ComponentsThe parts of the wind blowing straight down the runway (headwind or tailwind) and straight across it (crosswind), and comparing the crosswind component to your airplane's maximum demonstrated crosswind tells you whether a landing is within your and the aircraft's capability.

Magnetic VariationThe angular difference between true north and magnetic north at your location (east or west), applied to convert a true heading measured off the chart into the magnetic heading you fly by compass or heading indicator.

Compass DeviationThe small heading error caused by the airplane's own metal and electrical systems pulling on the magnetic compass, read from the placarded correction card and applied last to turn magnetic heading into the compass heading you actually steer.

Rate of Climb and Top of DescentYour vertical speed in feet per minute, and the point at which to begin descending, computed from altitude to lose, ground speed, and desired descent rate, so you reach pattern altitude on a stabilized profile rather than diving at the field.

Glide Ratio and RangeHow many feet forward the airplane travels per foot of altitude lost with the engine at idle, which converts your height above ground into a gliding distance and tells you whether a chosen field is actually reachable in an engine-out.

Fuel Burn and EnduranceYour fuel consumption rate (gallons per hour) and how long the usable fuel on board will last, and pairing endurance with ground speed and required reserves confirms the flight is legal and safe before you take off.

Weight and Balance / Center of Gravity (CG)The airplane's total loaded weight and the point it balances around, found from the weight of fuel, passengers, and baggage times their arms, and the CG must fall inside the manufacturer's envelope or the airplane may be unsafe to control.

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