How do you find the reciprocal runway number?

The reciprocal runway is the opposite end of the same physical strip, located exactly 180° opposite. To find it, add 180 to headings under 180°, or subtract 180 from headings above 180°. For example, the reciprocal of Runway 09 (090°) is Runway 27 (270°).

Why do runway numbers occasionally change at airports?

Because runway numbers are based on Magnetic North rather than True Geographic North, the natural movement of the Earth’s magnetic core (magnetic drift / secular variation) slowly alters local magnetic variation. Over decades, airports renumber and repaint runways when headings drift past the 5-degree threshold.

FAA / ICAO Magnetic Runway Designator

Runway Number Calculator

Convert any magnetic compass heading to its official airport runway designation. Calculate reciprocal runways, parallel strip suffixes (L/C/R), and magnetic rounding.

Magnetic Heading & Parallel Inputs

Runway Magnetic Centerline Heading: 88°

Parallel Runway Identifier (Optional)

FAA / ICAO Numbering Methodology:

Runways are designated according to their magnetic heading rounded to the nearest 10 degrees, with the trailing zero dropped. A runway with a heading of 088° becomes Runway 09.

The opposite end (reciprocal) is exactly 180° opposite. Runway 09’s reciprocal is Runway 27 (268° rounded to 270°).

Runway Designation Pair

Approach Heading 88°09L

Reciprocal 268°27R

Primary Heading:88° Mag (rnd: 90°)

Reciprocal Heading:268° Magnetic

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Runway Numbering Frequently Asked Questions

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Airport runways are numbered according to their magnetic heading rounded to the nearest 10 degrees, with the trailing zero dropped. For example, a runway oriented along magnetic heading 088° is rounded to 090° and designated Runway 09. A runway oriented at 356° is rounded to 360° and designated Runway 36.