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Tuition & Tuition Assistance

2021-2022 Tuition

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.

Upper School (9-12)  
Day Student $20,900
Boarding Student $38,900
Middle School (6-8)  
Day Student $18,200
Boarding Student (7-8) $36,200
Lower School (K-5) $13,000
PS3 (5 Full Days) $11,000
PS3 (3 Full/5 Half) $7,000
PS3 (3 Half Days) $5,500
PS4 (5 Full Days) $11,000
PS 4 (5 Half Days) $7,000

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  
Full-time care $1,000/month
Half-time care $550/month
Full-day drop in $65/day (4.5 hours or more)
Half-day drop in $35/day (less than 4.5 hours)
Elsah Bus $990 / year

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

January 2022 applications for domestic applicants November 20, 2021
Early Admission grade 9* December 10, 2021
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.

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.

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


New applicants who meet Principia's April 1 application deadline are automatically considered for the following scholarships:

Arthur F. Schulz Jr. Merit Scholarship

  • One-time value: $3,000
  • Eligibility: First-time Upper School students who are the children and/or grandchildren of Principia alumni

Whole Man Leadership Award

  • Renewable value: Covers tuition and room costs (excluding boarding meals or fees)
  • Eligibility: First-time Upper School boarding students

Selfless Servers Scholarship

  • One-time value: $3,000
  • Eligibility: First-time Middle and Upper School students