The calculator needed for precalculus depends on the course: a scientific calculator with trig and log functions will work for many non-AP classes, but a graphing calculator is required for the AP Precalculus exam.
The answer changes between a standard high school precalculus course and the College Board’s AP Precalculus exam. For AP students, the exam has calculator-required sections that a scientific calculator simply cannot handle. For non-AP courses, the requirements vary by school, but a graphing calculator is the safer bet if your class covers function analysis and graphing. Here is exactly what you need for each scenario.
AP Precalculus: Graphing Calculator Required
The College Board explicitly requires a graphing calculator for Parts B of Section I and Part A of Section II of the AP Precalculus exam. A standard scientific calculator will not satisfy this requirement. You have two options: a handheld model from the approved graphing-calculator series, or the built-in Desmos graphing calculator inside the Bluebook testing app. Note that the web-based or app-based Desmos calculator is not allowed on exam day — only the version integrated into Bluebook.
The approved calculator series include the Texas Instruments TI-84 Plus CE and TI-Nspire family (including CX and CAS models), the Casio FX-9750 and FX-CG-50 series, the HP Prime, the Sharp EL-9900 series, and the NumWorks with Software Version 19.3 or higher. Any model within an approved series qualifies, and the College Board’s calculator policy states that the AP Precalculus approved list is a subset of the full approved list. If you want to compare the top options side by side, our roundup of the best calculators for precalculus breaks down each model’s strengths and weaknesses.
Non-AP Precalculus: Scientific Calculator Is the Minimum
For a standard high school or college precalculus course that is not AP, a scientific calculator with trigonometric functions, exponents, roots, and logarithms is often sufficient. These typically cost between $9 and $50, while graphing calculators run $80 to $200. However, many instructors prefer or require a graphing calculator because precalculus curriculum commonly includes function analysis, graphing, and finding zeros and intersections. Check your syllabus or ask your teacher before buying, because the wrong choice can mean buying a second calculator mid-semester.
Key Capabilities a Precalculus Calculator Must Have
Whether you choose scientific or graphing, the calculator must handle the core precalculus workload. The College Board’s AP Precalculus calculator policy lists the required capabilities: performing calculations with exponents, roots, trig values, and logarithms; graphing functions and analyzing graphs; generating a table of values; finding real zeros, intersections, minima, maxima, and numerical solutions to one-variable equations; and performing regression equations (linear, quadratic, cubic, quartic, exponential, logarithmic, and sinusoidal) with residual plots. A scientific calculator covers the basic calculations and trig values, but it cannot graph, find intersections, or handle regressions — those tasks need a graphing model.
| Calculator Type | Price Range | Works for AP Precalculus Exam? |
|---|---|---|
| Scientific (e.g., TI-30X IIS) | $9–$20 | No — cannot graph or analyze functions |
| Entry Graphing (e.g., TI-84 Plus CE) | $100–$130 | Yes — fully approved |
| Advanced Graphing (e.g., TI-Nspire CX II CAS) | $150–$200 | Yes — fully approved, includes CAS |
| NumWorks | $80–$100 | Yes — with Software Version 19.3 or higher |
Common Mistakes to Avoid
The most frequent error is buying a non-graphing calculator for AP Precalculus. It will not satisfy the College Board’s requirement for the calculator-required sections, and you will not be able to complete those parts of the exam. Another common mistake is assuming that the web version or app version of Desmos is allowed on exam day — it is not; only the built-in Desmos through Bluebook is permitted. Finally, do not choose a calculator based only on price or brand without verifying it is on the approved series list (or meets the software version for NumWorks). A $12 scientific calculator that works for basic algebra will not get you through precalculus graphing assignments or the AP exam.
FAQs
Can I use Desmos on the AP Precalculus exam?
Yes, but only the Desmos graphing calculator built into the Bluebook testing application. The standalone web browser version or mobile app version of Desmos is not permitted during the exam.
What is the cheapest graphing calculator that works for AP Precalculus?
The NumWorks graphing calculator at around $80–$100 is typically the most affordable option that meets the College Board’s requirements. Older models like the TI-83 Plus (used) can sometimes be found for less, but check that they are on the approved series list.
Does my school’s precalculus class require the same calculator as AP Precalculus?
Not necessarily. Many non-AP precalculus courses only require a scientific calculator, while others recommend a graphing calculator. The safest approach is to check your course syllabus or ask your instructor before purchasing.
References & Sources
- College Board. “AP Precalculus: Graphing Calculators.” Official list of approved calculator series and exam policies.