Space Calculator
Enrollment, grade levels, and program goals turn into a planning-level square footage breakdown for opening year and as the school grows, so you walk into tours knowing what to look for. Free to use, no account needed.
What the Space Calculator estimates
- Instructional square footage for classrooms and small-group rooms
- Support square footage for offices, restrooms, circulation, and storage
- Total planning square footage for the whole building
- Site and outdoor square footage, reported separately from the building
- A growth view, so opening year and later years are sized together
How square footage per student works
Most K-12 planning starts from a square-foot-per-student figure applied to classroom space, then adds support space on top. The band you choose reflects the program you intend to run, not a rule you have to meet.
- Lean: 25 to 29 square feet per student
- Standard: 30 to 35 square feet per student
- Comfortable: 36 to 45 square feet per student
- Generous: 46 or more square feet per student
Who uses it
Microschool founders sizing a first space, charter leaders planning an expansion campus, and independent school operators pressure-testing a building they have already toured. The same calculation runs for a 20-student microschool and a 600-student campus.
What Space does not decide
SchoolStack Space produces planning-level estimates that help you ask better questions before you commit to a building. It does not determine legal use, zoning, building code outcomes, certificate of occupancy, licensing, insurance, authorizer decisions, or financing.
Treat every number here as a starting range to verify with your architect, your local planning and building departments, the fire marshal, and your authorizer or licensing agency.
Frequently asked questions
How many square feet per student does a school need?
Planning ranges usually run from about 25 square feet per student for a lean classroom program to 46 or more for a generous one, applied to classroom space before support space is added. The right figure depends on grade levels, program, and how much shared space the school runs. Your local building department and fire marshal set the occupant load for a specific building, so confirm any number against the actual space.
How much space does a microschool need?
A microschool serving 20 to 40 students often lands in the low thousands of square feet once classrooms, a small office, restrooms, and circulation are counted. Enter your enrollment and grade bands in the Space Calculator for a planning-level breakdown rather than a single rule of thumb.
Does the Space Calculator tell me whether a building can be used as a school?
No. It produces planning-level square footage only. Whether a specific building can house a school is a question for your local planning and building departments, the fire marshal, and your authorizer or licensing agency.