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Weather

Flight Category Calculator

Turn a ceiling and visibility into VFR, MVFR, IFR, or LIFR.

Inputs

ft
sm

Result

Flight category

IFR

Instrument — ceiling 500–1000 ft or vis 1–3 sm

Ceiling

800ft AGL

Visibility

2sm

IFR — ceiling 800 ft, visibility 2 sm

Formula

Ref
  • LIFR: ceiling < 500 ft or vis < 1 sm
  • IFR: ceiling 500–<1000 ft or vis 1–<3 sm
  • MVFR: ceiling 1000–3000 ft or vis 3–5 sm
  • VFR: ceiling > 3000 ft and vis > 5 sm

Worked example

Ref

Ceiling 800 ft, visibility 2 statute miles.

  1. 1.Ceiling 800 ft → 500–1,000 ft band → IFR.
  2. 2.Visibility 2 sm → 1–3 sm band → IFR.
  3. 3.Take the more restrictive of the two → IFR.

IFR — instrument conditions.

How it works

Ref

The VFR/MVFR/IFR/LIFR categories summarise whether conditions allow visual flight, and colour the weather charts pilots scan before departure. The category is the more restrictive of the ceiling-based and visibility-based bands — a high ceiling doesn't help if the visibility is poor.

DGCA student tip

Exam

Memorise the four boundaries as a ladder: 500 / 1,000 / 3,000 ft for ceiling and 1 / 3 / 5 sm for visibility. The colours (LIFR magenta, IFR red, MVFR blue, VFR green) are worth knowing for chart questions.

Common mistakes

Watch
  • Taking the better of ceiling/visibility instead of the more restrictive.
  • Using a FEW/SCT layer as the ceiling (only BKN/OVC count).
  • Mixing statute miles with nautical miles for visibility.