Crew Rest Requirement Calculator

Work out crew rest requirement instantly with clear inputs, formula shown and shareable results.

About Crew Rest Requirement Calculator

Rest must be at least as long as the preceding duty period, subject to a minimum floor, with extra rest when several time zones have been crossed because circadian adaptation lags. This models that structure so a roster can be sanity-checked before the formal legality check.

Formula

Rest requirement

Rest = max(floor, preceding duty) + 1 h per time zone beyond three

Worked example

With the default values below, Crew Rest Requirement Calculator returns Rest required of 14.50. Change any input above and every figure here is recalculated in your browser.

Inputs used

Preceding duty period: 12.5 h
Time zones crossed: 5 zones
Minimum rest floor: 12 h

Results

Rest required: 14.50 h
Rest if at least as long as duty: 12.50 h
Additional rest for time zone crossing: 2.00 h
Earliest report after rest: 14.50 h

Step by step

1Values used
2Rest requirement
3Rest required= 14.50 h
4Rest if at least as long as duty= 12.50 h
5Additional rest for time zone crossing= 2.00 h
6Earliest report after rest= 14.50 h

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax or fees or charges into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Aviation results are planning estimates only. Always verify take-off, landing, fuel, weight and balance figures against the certified Aircraft Flight Manual, current performance charts and applicable aviation regulations before flight.

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

Aviation results are planning estimates only. Always verify take-off, landing, fuel, weight and balance figures against the certified Aircraft Flight Manual, current performance charts and applicable aviation regulations before flight.

Frequently Asked Questions

Is rest measured door to door?

Rest normally starts after post-flight duties end and finishes when the next report time begins, so travel and hotel check-in eat into it.

Why do time zones add rest?

The body clock shifts about one hour per day, so crossing many zones leaves the crew operating at a circadian low unless extra rest is given.