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Available Seat Kilometres Calculator

Work out available seat kilometres instantly with clear inputs, formula shown and shareable results.

About Available Seat Kilometres Calculator

Available seat kilometres is the industry's capacity unit: seats multiplied by the distance they are flown, summed over every flight. Revenue passenger kilometres is the same figure multiplied by load factor, and the ratio of the two is exactly the load factor.

Formula

Capacity metrics

ASK = seats x distance x flights; RPK = ASK x load factor

Worked example

With the default values below, Available Seat Kilometres Calculator returns Available seat kilometres of 161,820,000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Seats per aircraft
180 seats
Sector distance
1,450 km
Flights in the period
620 flights
Average load factor
82 %

Results

Available seat kilometres
161,820,000 ASK
Revenue passenger kilometres
132,692,400 RPK
ASK per flight
261,000 ASK
Passengers carried
91,512 pax

Step by step

  1. 1Values used
  2. 2Capacity metrics
  3. 3Available seat kilometres= 161,820,000 ASK
  4. 4Revenue passenger kilometres= 132,692,400 RPK
  5. 5ASK per flight= 261,000 ASK
  6. 6Passengers carried= 91,512 pax

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation or tax into account.
  • Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why use ASK rather than flights or seats?

Because a seat flown 5,000 km consumes far more resource than one flown 500 km. ASK weights capacity by distance, making cost comparisons meaningful.

Are ASM and ASK interchangeable?

They measure the same thing in different units — statute miles versus kilometres. Multiply ASM by 1.609 to get ASK.

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