School holiday care budget calculator

Calculate total session fees and uncovered household session intervals [date,start,end] with your own figures.

Your numbers

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

Choose the currency for these amounts. Changing it keeps your numbers and does not convert exchange rates.

Use total session fees and uncovered household session intervals [date,start,end] to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Holiday care requirements JSON [ISO date,start minute,end minute]
[["2026-12-21",540,1020],["2026-12-22",540,1020]]
Booked sessions JSON [ISO date,start,end,child IDs,price per child currency] (USD)
[["2026-12-21",540,1020,["A","B"],40],["2026-12-22",540,900,["A","B"],30]]
User sibling discount JSON {child ID:fraction off session price}
{"A":0,"B":0.25}
Total session fees (USD)
$122.50
Uncovered household session intervals [date,start,end]
[["2026-12-22",900,1020]]
Booked session count
2

Try another scenario

Holiday care requirements JSON [ISO date,start minute,end minute]
[["2026-12-21",540,1020],["2026-12-22",540,1020]]
Booked sessions JSON [ISO date,start,end,child IDs,price per child currency] (USD)
[["2026-12-21",540,1020,["A","B"],45],["2026-12-22",540,1020,["A","B"],35]]
User sibling discount JSON {child ID:fraction off session price}
{"A":0,"B":0.25}
Total session fees (USD)
$140.00
Uncovered household session intervals [date,start,end]
[]
Booked session count
2
Calculation method

Calculation method

Total session fees (USD)

Sum per-session per-child fee*(1-explicitChildDiscount).

Uncovered household session intervals [date,start,end]

For each care requirement subtract the union of booked sessions on that date.

Booked session count

Count session rows.

Symbols and units
a
Holiday care requirements JSON [ISO date,start minute,end minute]
b
Booked sessions JSON [ISO date,start,end,child IDs,price per child currency] (USD)
c
User sibling discount JSON {child ID:fraction off session price}

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

  • Budget and household session coverage assuming each booking covers all listed children and required coverage is for that same group. Discount is explicitly per child and per session; no eligibility, subsidy, tax or provider booking inferred. Supported limits: Valid ISO dates; integer 0<=start<end<=1440; prices>=0; discount in [0,1]; identical required child group across sessions; incompatible overlapping bookings rejected.
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