Pool lifeguard rota coverage calculator

Calculate coverage gaps [start,end,required,available] and total uncovered post-minutes with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use coverage gaps [start,end,required,available] and total uncovered post-minutes to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Required qualified-post windows JSON [[start,end,posts],...]
[[0,240,2],[240,480,3]]
Qualified on-duty staff availability excluding breaks JSON [[start,end],...]
[[0,480],[0,240],[240,480]]
Coverage gaps [start,end,required,available]
[[240,480,3,2]]
Total uncovered post-minutes
240

Try another scenario

Required qualified-post windows JSON [[start,end,posts],...]
[[0,241,2],[240,480,3]]
Qualified on-duty staff availability excluding breaks JSON [[start,end],...]
[[0,480],[0,240],[240,480]]
Coverage gaps [start,end,required,available]
[[240,241,5,2],[241,480,3,2]]
Total uncovered post-minutes
242
Calculation method

Calculation method

Coverage gaps [start,end,required,available]

Sum required posts and staff count on every combined boundary segment; qualified windows must already exclude breaks.

Total uncovered post-minutes

Sum required posts and staff count on every combined boundary segment; qualified windows must already exclude breaks.

Symbols and units
a
Required qualified-post windows JSON [[start,end,posts],...]
b
Qualified on-duty staff availability excluding breaks JSON [[start,end],...]

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Facility supplies required posts and qualifying staff intervals. No statutory staffing determination; avoid duplicate simultaneous windows for the same person. Supported limits: All required fields must be finite values of the exact declared type and within displayed bounds. Lists contain1–1000 finite numbers. JSON tables are numeric rectangular rows, at most100 rows and30 columns; individual tools have stricter shape/domain constraints. Facility supplies required posts and qualifying staff intervals. No statutory staffing determination; avoid duplicate simultaneous windows for the same person.
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