The digital SAT includes a built-in Desmos graphing calculator in the testing app, and students may also bring an approved handheld calculator. The ACT allows most calculators on the math test but prohibits computer algebra system (CAS) models such as the TI-89 and TI-Nspire CAS. AP math and science exams publish their own approved lists. A non-CAS graphing calculator such as a TI-84 Plus CE model is accepted on all three, which is why many schools standardize on one.
Calculator rules differ between tests, and the most capable models are not allowed everywhere.
Exam rules at a glance
| Exam | Calculator policy |
|---|---|
| Digital SAT | Built-in Desmos graphing calculator; approved handhelds also allowed on Math |
| ACT | Calculators allowed on the math test; CAS models prohibited |
| AP exams | Each exam lists permitted calculators; graphing calculators required on some |
Policies change, so read the official calculator policy from the College Board and ACT before test day.
CAS or not?
A computer algebra system (CAS) solves equations symbolically. That is powerful for advanced classes, but it is banned on the ACT. A non-CAS graphing calculator is the safe choice for students who will take several exams.
Choosing one calculator for high school
- Ask the math department. Teachers often teach button-by-button on one model.
- Check the exams the student will take.
- Rechargeable batteries save money over a few years.
- Color screens help with graphs but are not required.
Free tools
Desmos and similar web calculators are free and excellent for homework and learning. Many classrooms use them alongside a handheld.
For test prep resources, see SAT vs ACT. For younger STEM learners, see coding kits by age.
Browse study tools and classroom.
Common questions
Do I need my own calculator for the digital SAT?
Not necessarily. The testing app includes a Desmos graphing calculator, but you may bring an approved handheld calculator if you prefer.
Can I use a TI-Nspire CAS on the ACT?
No. The ACT prohibits calculators with a computer algebra system. The non-CAS TI-Nspire CX is allowed.
What calculator do AP exams require?
AP Calculus, Statistics, Physics and Chemistry each have calculator policies; check the College Board's current list for your exam.
Is a graphing calculator still worth buying?
Usually yes, for classes and for exams that do not provide one. Check what your school's teachers use.