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Aviation Calculator

Aviation Calculations & Conversions by Joachim K. Hochwarth

The following calculations have been carefully reviewed and tested but it cannot be guaranteed that they will return correct results! Please send any Comments/Suggestions/Questions to "aviationcalculator at hochwarth.com".

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· Calculate QNH & QFE
· Calculate Crossover Altitude
· International Standard Atmosphere (ISA) & U.S. Standard Atmosphere of 1976
· Calculate Pressure Altitude
· CAS/Mach/TAS/EAS Conversions

· Great Circle Calculator (by Ed Williams)

· Change Log

· Add to Favorites... (IE)


Calculate QNH (Quasi-Nonhydrostatic/"Nautical Height") & QFE (Local Station Pressure/"Field Elevation") Wikipedia

QNH refers to the altimeter setting so that an aircraft's altitude above MSL (Mean Sea Level) is indicated. This setting is used during departure and approach and requires the pilot to set the local pressure at MSL. It is provided in the ATIS information and by ATC.

h (Station above MSL) QFE (Local Station Pressure) h (Station above MSL) QNH (Quasi-Nonhydrostatic)
QNH QFE


Calculate Crossover Altitude

The Crossosver Altitude is the altitude at which a specified CAS and Mach value represent the same TAS value. The curves for constant CAS and constant Mach intersect at this point. Above this altitude the Mach number is used to reference speeds.

CAS (Calibrated Airspeed)
Mach
Crossover Altitude


International Standard Atmosphere (ISA) Wikipedia & U.S. Standard Atmosphere of 1976 Wikipedia

The following calculations are based on the International Standard Atmosphere (ISA) & U.S. Standard Atmosphere of 1976. The current implementation will only give correct results for altitudes up to 32,000 [m] - i.e. Troposphere (Layer 0)/Tropopause (Layer 1) and Lower Stratosphere (Layer 2).

Altitude (MSL)
Temperature
Pressure
Density
Speed of Sound


Calculate Pressure Altitude

This will calculate the altitude at which the specified pressure can be found. It is the inverse calculation of the above International Standard Atmosphere (ISA) & U.S. Standard Atmosphere of 1976 pressure calculation and is subject to the same limitation of 32,000 [m].

Pressure
Pressure Altitude


CAS/Mach/TAS/EAS Conversions

The following will calculate three speeds based on the altitude and entered fourth speed - e.g. CAS/Mach/EAS based on Altitude and TAS. These calculations are based on the International Standard Atmosphere (ISA) & U.S. Standard Atmosphere of 1976 and are subject to the same 32,000 [m] limitation. They are also resticted to only subsonic speeds. The calculation is performed by pressing the button below the entered speed - e.g. TAS.

Altitude (MSL)
CAS (Calibrated Airspeed) Mach TAS (True Airspeed) EAS (Equivalent Airspeed) Wikipedia DISA (Delta International Standard Atmosphere)


Change Log

1.8.3 (03/30/2018)
· The link to Great Circle Calculator (by Ed Williams) was updated.

1.8.2 (05/10/2017)
· The site should again work with Edge and Internet Explorer 11.

1.8.1 (04/02/2017)
· The site now issues a warning if JavaScript is not enabled.

1.8.0 (01/02/2017)
· Calculations now include the Lower Stratosphere (20,000 - 32,000 [m]) while also referencing the International Standard Atmosphere (ISA) in addition to the U.S. Standard Atmosphere of 1976.
· CAS/Mach/TAS/EAS Conversions now include Delta International Standard Atmosphere (DISA).
· International Standard Atmosphere (ISA) & U.S. Standard Atmosphere of 1976 as well as Calculate Pressure Altitude will calculate on Enter.

1.0.0 - 1.7.4
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© 2003-2018 Joachim K. Hochwarth Version 1.8.3 · Last Modified > 03/31/2018
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Generic Aviation Calculator

Wind Speed
Result can be either Knots or MPH based on consistent entry of the same designation.
Enter   Ground Speed
Enter   True Airspeed
Enter   Course
Enter   Heading
Calculated Wind Speed =
Wind Direction
Result can be either Knots or MPH based on consistent entry of the same designation.
Enter   Ground Speed
Enter   True Airspeed
Enter   Course
Enter   Heading
Calculated Wind Direction =
Heading, Ground Speed, And Wind Correction Angle
Result can be either Knots or MPH based on consistent entry of the same designation.
Enter   Wind Speed
Enter   Wind Direction
Enter   True Airspeed
Enter   Course
Calculated   Heading
Calculated   Ground Speed
Calculated   Wind Correction Angle
Course, Ground Speed, And Wind Correction Angle
Result can be either Knots or MPH based on consistent entry of the same designation.
Enter   Wind Speed
Enter   Wind Direction
Enter   True Airspeed
Enter   Heading
Calculated   Course
Calculated   Ground Speed
Calculated   Wind Correction Angle
Magnetic Variation
This calculator is specifically for the Continental USA only
Latitude (North Degrees)
Enter   - -
Longitude (West Degrees)
Enter   - -
Calculated Variation =
Magnetic Variation
This calculator is specifically for the Alaska region only
Latitude (North Degrees)
Enter   - -
Longitude (West Degrees)
Enter   - -
Calculated Variation =
Magnetic Variation
This calculator is specifically for the Western Europe region only
Latitude (North Degrees)
Enter   - -
Longitude (West Degrees)
Enter   - -
Calculated Variation =
Density Altitude
Enter   Pressure Altitude (Ft)
Enter   Actual Temperature
Calculated Density Altitude =
Runway Crosswinds
Enter    Runway Compass Heading
Enter    Wind (From) Compass Direction
Enter    Wind Speed In Knots or MPH
Calculated    Crosswind In Knots or MPH From
Calculated    Forward Ground Speed In Knots or MPH
Fahrenheit to Celsius
This conversion of temperature is made using the formula Fahrenheit = ((9/5)*Celsius)+32
Enter   °F
Calculated Temperature = °C
Celsius to Fahrenheit
This conversion of temperature is made using the formula Celsius = (5/9)*(Fahrenheit-32);
Enter   °C
Calculated Temperature = °F
Wind Chill
Wind chill cannot be accurately calculated for outside air temperatures (OAT) greater that 50 °F (10 °C) and wind speeds less than 4 MPH (3.5 Knots).
Enter   Temperature (OAT) °F °C
Enter   Wind MPH Knots
Calculated Wind Chill = °F or °C
Heat Index
Determine the heat index from the outside air temperature (OAT) and Relative Humidity.
Enter   Temperature (OAT) °F °C
Enter   % Relative Humidity
Calculated Heat Index = °F or °C
Dewpoint
Calculate the Dewpoint from the outside air temperature (OAT) and Relative Humidity
Enter   Temperature (OAT) °F °C
Enter   % Relative Humidity
Calculated Dewpoint = °F °C
Relative Humidity
Calculate the Relative Humidity from the outside air temperature (OAT) and Dewpoint
Enter   Temperature (OAT) °F °C
Enter   Dewpoint °F °C
Calculated Relative Humidity =  %
Pressure Conversion
Convert Millibars to Inches of Mercury and Inches of Mercury to Millibars
Enter   Millibars Inches Mercury
Converted Barometric Pressure =
Miles Per Hour To Knots
This conversion of speed (or distance) is made using the formula (Knots (or nautical miles) = MPH (or miles) * 0.86897624)
Enter   MPH or Statute Miles
Calculated Knots Or Nautical Miles =
Knots to Miles Per Hour
This conversion of speed (or distance) is made using the formula (MPH (or statute miles) = Knots (or nautical miles) * 1.15077945)
Enter   Knots or Nautical Miles
Calculated MPH or Statute Miles =
True Airspeed (TAS or KTAS)
Result can be either Knots or MPH based on consistent entry of the same designation. The formula is (IAS) + (.02 x MSL / 1000).
Enter   Indicated Airspeed
Enter   MSL Altitude
Calculated True Airpeed =


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