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Tuition & Tuition Assistance

Serving children from infancy through grade 12, Principia School is a student-centered, future-focused coeducational day and boarding school grounded on the teachings of Christian Science. We welcome students of diverse faiths who value scholarship and are eager to grow in character, embrace opportunity, and pursue excellence.

2022-2023 Tuition

Upper School (9-12)  
Day Student $22,120
Boarding Student $41,160
Middle School (6-8)  
Day Student $19,280
Boarding Student (7-8) $38,320
Lower School (K-5) $13,750
PS3 (5 Full Days) $11,690
PS3 (3 Full/5 Half) $7,460
PS3 (3 Half Days) $5,850
PS4 (5 Full Days) $11,690
PS 4 (5 Half Days) $7,460
Note: US, MS, LS, & PS Tuition figures include tuition, activity and tech fees, lunch, field trips, and PPA dues. Tuition assistance is available for PS3 through 12th grade.
Early Learning Center  
Options vary. Please contact Ginger Roth for information about ELC tuition at 314.514.3188 or by email.

Questions About Financial Aid or Scholarships? Contact Us.

Financial Aid: Krista Capp, 314.514.3142. Contact Krista.

Scholarships: Adriane Fredrikson, 314.514.3130. Contact Adriane.

Scholarship Information

Tuition Assistance

We are committed to building a community of learners, and that means making a Principia education affordable for all qualified students preschool–grade 12. 

Financial aid is based on demonstrated need and comes in the form of grants, not loans. Applications are completed online via the School & Student Services (SSS) website. There is a $55 application fee. Financial aid applications follow the same admission application deadlines. Admittance and financial aid decisions are communicated at the same time. Contact Krista Capp, Director of Financial Aid at 314.514.3142 or for additional questions. 

Financial-aid applications for fall 2022 will be available on October 4, 2021.

Application Deadlines

Early Admission grades 6–12* January 11, 2022
Early Admission preschool through grade 5 January 28, 2022
International Applicants grades 9–12 February 1, 2022
Priority Admission Applicants* — all levels April 1, 2022
Late Admission Applicants — all levels June 20, 2022

* (scholarships available)

Adhering to these application deadlines is essential for financial aid consideration.

For Level Specific Financial Aid Information



Early Childhood






Lower School






Middle School






Upper School




Applying for Aid

New International Students

New Domestic Applicants

  • Complete and submit the SSS Financial Aid Application

  • Review How to Apply for step-by-step instructions for completing the application

  • Our school code is – 5908 (or you can enter “Principia School”)

  • Provide 2020 tax documents

Contact Student Support Services (SSS) at 800.344.8328 or

Scholarship Information