Free tool
How fast a reusable sub folder pays back the time to build it
Enter your period count and how long plans take you now to see the build cost in hours and the payback in absences.
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What a year of teacher absences costs your building
Enter your staff size, absence rate, sub pay, and fill rate to see the annual coverage bill including the days nobody fills.
The daily sub rate is the number everyone quotes and the smallest part of the bill. Employer payroll costs sit on top of it. Then come the days no substitute takes the job, when the building pays coverage stipends, buys out prep periods, or splits a class across three rooms and calls it a wash. This calculator adds those pieces into one annual figure you can put in front of a principal.
Defaults describe a mid size elementary or middle school with a staff around forty and a fill rate in the mid eighties. Change the fill rate first. That single number moves the total more than the daily sub rate does, which is usually a surprise to whoever is arguing about the sub rate.
Your result
Absence days per year
378
Total teacher days out across the building in one school year.
Substitute pay per year
$51,565
Filled days multiplied by the daily rate plus employer payroll costs.
Internal coverage pay per year
$10,584
What the building pays its own staff to absorb unfilled jobs.
Total annual coverage cost
$62,149
Both halves of the bill in one number for the budget conversation.
Treat this as a planning estimate rather than a payroll figure, and remember it does not price the instruction that never happened.
Why the fill rate moves the total more than the sub rate
Raising the daily sub rate raises the cost of the days you were already covering. Lowering the fill rate shifts days into the most expensive column there is, where four or five staff members each get a stipend to absorb one block and a class of twenty eight gets split into three rooms. Drag the fill rate down ten points in the calculator and watch which line grows.
This is why buildings that only negotiate the sub rate often see no change in the total. The lever with real weight is how many jobs get taken, and one thing that visibly moves it is whether substitutes find a usable day waiting for them. Subs talk to each other about which schools are worth accepting.
Taking the number to a principal or a business office
Bring three figures, not a spreadsheet. The total, the internal coverage line, and the number of days a year your building runs without a substitute. Those three land in a budget meeting because they map to money already being spent rather than money being requested.
Then name the cheapest change on the list. A building sized plan library costs $149 a month and does nothing about the fill rate, but it does mean the split classes and the covering teachers have real work to run. That is a different conversation than asking for a higher daily rate the district sets anyway.
Questions about this calculator
Where do I find my building fill rate?
The front office usually knows it by feel and the district system can report it. If nobody has a number, count the mornings last month when a job stayed open past the first bell and divide by absences. Even a rough figure beats using the district average.
Should I include long term leaves in the absence days?
No. Long term leaves are staffed differently and priced differently, so mixing them in distorts the daily picture. Run this for ordinary sick and personal days, then handle a twelve week leave as its own line.
Does this include the cost of lost instruction?
It does not, and that is deliberate. Putting a dollar figure on a lost day of instruction invites an argument about the assumption instead of the total. The cash lines above are hard enough to defend on their own.
More free tools and working documents
Working document
The one day substitute handoff template
A fill in template that turns a sick day into a taught day, written so a substitute who has never met your class can run it cold.
The figure on screen is the argument
Whatever this calculator just returned for your building, the plans a substitute teaches from are the cheapest line on it to fix. Book a short demo and we will build one ready to teach day for your room, with timed blocks, a seating chart, and fallback work for the section that finishes early. You will know by the end whether it beats what is in your folder now.