Airline RASK vs CASK
Turn an airline’s capacity, load factor, fares and costs into revenue and cost per seat-kilometre, the profit between them, and the load factor at which it breaks even.
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How to use this calculator
Each step names a control you will find on screen above.
- Capacity (ASK)
Available seat-kilometres for the year, in crore — seats flown multiplied by kilometres flown. Airlines report it in their results.
- Load factor and passenger yield
The share of seats sold, and the average ticket revenue per revenue passenger-kilometre. Together they set how much each seat-kilometre earns from tickets.
- Ancillary revenue
Baggage, seat selection, meals and other non-ticket income, as a percentage of ticket revenue.
- Costs per ASK
Split cost per available seat-kilometre into fuel and everything else, so you can shock fuel on its own. The readout shows what a 10% rise in fuel alone would do.
Worked example: Fourteen paise a seat-kilometre
An airline flies 10,000 crore seat-kilometres, 80% full, at a yield of ₹5.50 with ancillary income of 10% on top. It costs ₹2.80 per seat-kilometre excluding fuel and ₹1.90 of fuel.
What to enter
- Capacity (ASK)
- 10,000 crore seat-km
- Load factor
- 80%
- Passenger yield
- ₹5.50 / RPK
- Ancillary revenue
- 10% of tickets
- Cost per ASK, excluding fuel
- ₹2.80
- Fuel cost per ASK
- ₹1.90
What it shows you
- RASK
- ₹4.84
- CASK
- ₹4.70
- Spread per ASK
- ₹0.14
- Revenue
- ₹48,400 Cr
- Operating profit
- ₹1,400 Cr
- Breakeven load factor
- 77.7%
Where this is taught
A calculator gives you a number. These explain what the number means and when it misleads you.