PlaneCalc

Aircraft Operating Cost Calculator

Fixed costs don't care how much you fly; variable costs only show up when you do. Split them out, then see the blended $/hr at your actual utilization. Defaults are a Cessna 421B, a representative cabin-class piston twin — swap in your own airplane's numbers.

Acquisition

Fixed, per year

Variable, per flight hour

Utilization

Ownership

① Fixed costs — shared by ownership, whether it flies or not

$54,900
per year
$4,575
per month
Insurance$9,250
Hangar$11,400
Annual inspection + squawks$30,000
Recurrent training$3,000
Charts, databases, ADS-B$1,250
Category$/year$/month
Insurance$9,250$771
Hangar$11,400$950
Annual inspection + squawks$30,000$2,500
Recurrent training$3,000$250
Charts, databases, ADS-B$1,250$104
Total$54,900$4,575

② Variable costs — the cost of flying it, paid by whoever operates it

$48,200
per year, at 100 hrs flown
Fuel$30,000
Oil & consumables$800
Engine overhaul reserve$12,500
Prop reserve$900
Airframe reserve$4,000
Category$/hr$ at your hours
Fuel$300.00$30,000
Oil & consumables$8.00$800
Engine overhaul reserve$125.00$12,500
Prop reserve$9.00$900
Airframe reserve$40.00$4,000
Total$482.00$48,200

③ Hourly rate — same $/hr for every pilot, regardless of ownership share

$482
$/flight hour
Fuel$300.00
Oil & consumables$8.00
Engine overhaul reserve$125.00
Prop reserve$9.00
Airframe reserve$40.00
Category$/hr
Fuel$300.00
Oil & consumables$8.00
Engine overhaul reserve$125.00
Prop reserve$9.00
Airframe reserve$40.00
Total$482.00

Ownership stake doesn't change this rate — a renter, a low-ownership partner, and the majority owner all pay the same $/hr for their own flying. Multiply by hours flown to get bucket ②'s dollar total.

Reference: total all-in cost by utilization

Hours/yrBucket ① + ②$/hr blended
75$91,050$1,214
100$103,100$1,031
150$127,200$848
See the math

Three buckets, kept deliberately separate: ① fixed (insurance + hangar + annual/squawks + training + subscriptions = $54,900/yr, $4,575/mo) is owed whether the airplane flies 0 hours or 300, and splits by ownership share — everyone who owns a piece pays their share regardless of who's flying. ③ the hourly rate ($482.00/hr: fuel $300 + oil $8 + engine/prop/airframe reserves) is a flat rate every pilot pays for their own hours, ownership share irrelevant — it's the direct cost of turning the engines. ② variable is just that rate applied to actual hours flown ($48,200/yr at 100 hrs total), split among operators by whose hours they are, not by ownership %. Reserves are overhaul cost ÷ TBO hours, banked per hour flown so the airplane pays for its own next overhaul.

Frequently asked questions

What's the real cost per hour to fly a piston twin?

It depends heavily on how many hours you fly a year, since fixed costs (insurance, hangar, annual inspection) don't scale with hours. For a Cessna 421B at typical fixed costs of ~$55k/yr and ~$480/hr variable, flying 75 hrs a year costs roughly $1,200/hr blended; flying 150 hrs drops that to roughly $850/hr — same airplane, very different economics.

What is an engine reserve and why budget for it?

An engine reserve is the overhaul cost divided by the engine's TBO (time between overhauls) hours, set aside per flight hour so the airplane funds its own next overhaul instead of surprising you with a six-figure bill. For a geared twin-Cessna engine, that's roughly $110–$140/hr against a ~$100k overhaul spread over a 1,600-hour TBO.

Why do twin Cessna annual inspections cost so much?

Twin Cessnas (400-series) carry pressurization, retractable gear, and two engines/props worth of squawks, and annuals on the type commonly run $20,000–$40,000 or more depending on the airframe's condition and deferred maintenance.

Educational tool — every airframe and engine program is different; get a firm quote from your insurer, shop and type-club before budgeting against these numbers.