Educational calculators only. Not for operational flight planning.

Aviation Calculators for Flight Planning and Learning

Thirty free calculators for speed, wind, altitude, fuel and aerodynamics, each with its formula, a worked example and a plain-language guide. Built for learning how the numbers work.

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Generic aircraft following a course line across a stylised navigation chart with a compass rose, wind arrow and GS, TAS, WCA and DA readout tiles.

AviationCalc is a set of browser-based calculators for the arithmetic behind flying: wind triangles, airspeed conversions, the standard atmosphere, fuel sums, climb gradients and the basic force equations. Every page shows the formula it uses, works an example step by step and says plainly what the formula leaves out.

  • 30 calculators
  • 30 guides
  • 8 topics

Calculator directory

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Density Altitude Calculator

Density altitude from field elevation, altimeter setting and outside air temperature (dry air).

Atmosphere and Altitude

True Airspeed Calculator

Convert calibrated airspeed to true airspeed from pressure altitude and outside air temperature.

Flight Speed and Distance

Browse by topic

Flight Speed and Distance 6 calculators Aviation Navigation 2 calculators Wind Calculations 2 calculators Atmosphere and Altitude 6 calculators Aviation Fuel Mathematics 3 calculators Aircraft Performance Concepts 4 calculators Aerodynamics 5 calculators Aviation Units and Conversions 2 calculators

Recently published guides

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Aviation Navigation

Common Aviation Calculation Mistakes

Unit mix-ups, true versus magnetic, wind from versus to, and airspeed used as ground speed: the common errors, with the size of each shown.

Aerodynamics

Understanding Aircraft Turn Radius

Turn radius depends only on true airspeed and bank angle. See why doubling the speed quadruples the radius and what steeper bank costs.

Aircraft Performance Concepts

Thrust-to-Weight Ratio in Aviation

Thrust-to-weight ratio is a dimensionless comparison of two forces, and it changes throughout a flight as thrust varies and fuel burns off.

Aerodynamics

Wing Loading Explained

Wing loading is aircraft weight divided by wing area. Learn how that one ratio shapes stall speed, turning ability and the ride in rough air.

Aerodynamics

Understanding Aerodynamic Drag

Parasite drag rises with the square of speed and induced drag falls with it. See how the two add up to a total drag curve with a minimum.

How AviationCalc works

  1. Enter your own values

    Pick the units you have. Each field is checked, and anything missing or out of range is explained beside the field. Aircraft-specific numbers are always yours to supply; the site does not guess them.

  2. See the result and the working

    The calculation runs in your browser, so nothing you type is sent to us. Open "Show the working" to follow each step with your numbers substituted into the formula.

  3. Learn what is behind it

    Every calculator lists its formula, variables, assumptions and common mistakes, and links to a guide that explains the idea in plain language with public references.

Accuracy and limitations

The formulas are standard textbook relationships, the unit factors are the exact international definitions, and every calculator is checked by automated tests against hand-worked values and a second, independently written implementation.

That makes the arithmetic dependable. It does not make the site a flight-planning tool. The models are simplified, the real atmosphere is not the standard atmosphere, and nothing here knows your aircraft.

AviationCalc provides educational calculations only. Results are not certified for operational flight planning or aircraft performance decisions. Always consult approved aircraft documentation and official aviation information before flight operations.

How the calculations are made