Block Time vs Flight Time Calculator
Airborne time plus taxi, run-up and pattern — the block time that schedules, rentals and airline stats actually run on.
A 95-minute flight is a 2.0 on the Hobbs by the time the chocks are back in. Renters budget by block, airlines schedule by block, and fuel reserves should remember the taxi burn too.
Formula
⚠️ For flight planning and education only — verify with official sources, your POH/AFM and certified equipment. Not for primary navigation.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Airborne time plus taxi, run-up and pattern — the block time that schedules, rentals and airline stats actually run on.
About Block Time vs Flight Time Calculator
The navlog says 1:35; the rental invoice says 2.0 — both are right, measuring different clocks. Block time runs chock to chock: taxi out, run-up, the pattern dance at both ends, taxi in. This calculator assembles it from your airborne estimate plus realistic ground allowances, returns the Hobbs-style decimal that rentals bill by, and shows the overhead percentage — startlingly large on short hops, which is exactly why short legs cost more per mile.
How to use Block Time vs Flight Time Calculator
- 1Enter — sensible defaults are pre-filled so you see a worked result immediately.
- 2Read the live results: .
- 3Check the "With your numbers" line to see the formula block = airborne + taxi out + run-up + maneuvering + taxi in substituted step by step.
- 4Adjust inputs (or flip the unit toggle) until the scenario matches yours, then copy or share the result.
Why use Block Time vs Flight Time Calculator?
- ✓Instant, free and private — every calculation runs in your browser, nothing is uploaded
- ✓Built on the published formula block = airborne + taxi out + run-up + maneuvering + taxi in with sources cited on the page
- ✓A 95-minute flight is a 2.0 on the Hobbs by the time the chocks are back in. Renters budget by block, airlines schedule by block, and fuel reserves should remember the taxi burn too.
- ✓Switch units, tweak any input and watch every result update live
Frequently asked questions
What's the difference between Hobbs and tach time, while we're at it?+
Hobbs runs whenever the engine does (oil-pressure switch), counting real clock minutes — that's block time, what most rentals bill. Tach time counts engine revolutions normalized to cruise RPM, so it runs slow at idle: a typical flight logs 10–20% less tach than Hobbs. Know which meter your rate is attached to; the same flight differs by 0.2–0.3.
How much taxi time should I budget at different airports?+
Non-towered field: 5–10 minutes out including run-up. Towered GA airport: 10–15. Big international with GA ops: 15–25 and a possible hold for wake spacing. Airlines budget airport-specific taxi from historical data — JFK departures carry 25+ minute allowances. Your fuel plan should taxi on the same clock your schedule does.
Why is the overhead percentage so brutal on short flights?+
The ground tax is fixed while the airborne time shrinks: 23 minutes of taxi-and-pattern is 12% of a three-hour leg but 70% of a half-hour hop. It's the same economics that make airlines' short sectors expensive and why the 50-nm 'quick flight' to the cheaper fuel rarely pays for itself in saved gas.
Do airlines schedule the block times we experience?+
Yes — published schedules are block, gate to gate, padded with historical taxi data per airport-pair and season (schedule padding has grown ~10% over two decades). 'Early arrivals' are mostly padding refunds. When you log an airline jumpseat or compare your planning to flight-tracking data, block vs airborne is the first reconciliation.
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