ACT Approved Calculators Estimator
Verify if your device meets the ACT calculator policy and estimate its performance for test day.
Select the model you plan to use for the ACT.
Higher brightness drains battery faster during the 60-minute math section.
The health of your power source affects reliability.
Compliance Status
Projected Battery Drain (60-Minute Math Section)
Green line: Your device | Red line: Critical threshold
| Feature | Your Selection | ACT Requirement |
|---|---|---|
| CAS Functionality | None | Prohibited |
| QWERTY Keyboard | None | Prohibited |
| Wireless/Bluetooth | None | Prohibited |
Formula: Reliability = (Battery Capacity / (Base Power + (Brightness * 0.15))) * Compliance Factor.
What are ACT Approved Calculators?
ACT Approved Calculators are specific models of electronic calculating devices that the ACT organization permits students to use during the Mathematics portion of the test. Unlike some other standardized tests, the ACT has a very strict policy regarding which devices can enter the testing center. Using a prohibited device can lead to immediate disqualification and the voiding of your scores.
Who should use this? Any high school student preparing for the ACT should verify their device against the latest ACT calculator policy. A common misconception is that all graphing calculators are allowed; however, models with Computer Algebra Systems (CAS) are strictly forbidden because they can solve algebraic equations automatically, which defeats the purpose of the math assessment.
ACT Approved Calculators Formula and Mathematical Explanation
While "approval" is a binary state (Yes/No), the performance of ACT approved calculators can be modeled mathematically to ensure they don't fail during the exam. We use a reliability index to help students understand their risk level.
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| B | Battery Capacity | mAh | 800 – 2000 |
| P | Base Power Draw | mW | 10 – 50 |
| L | Brightness Level | Scale | 1 – 10 |
| C | Compliance Factor | Binary | 0 or 1 |
Practical Examples (Real-World Use Cases)
Example 1: The Standard TI-84 Plus CE
A student uses a TI-84 Plus CE ACT model. This device is approved (C=1). With a battery capacity of 1200mAh and a brightness setting of 5, the power draw is moderate. The calculation shows a reliability score of 98%, meaning the student is highly unlikely to face power issues during the 60-minute section.
Example 2: The Prohibited TI-89
A student brings a TI-89 Titanium. Although it is a powerful tool, it features a Computer Algebra System. In our estimator, the Compliance Factor (C) drops to 0. Regardless of battery life, the status remains "PROHIBITED," and the student should switch to graphing calculators for ACT that are permitted.
How to Use This ACT Approved Calculators Estimator
- Select your specific calculator model from the dropdown menu.
- Adjust the brightness level to match how you typically use the device.
- Choose your battery type to see how it impacts test-day reliability.
- Review the "Compliance Status" box. If it turns red, you must find a different calculator.
- Check the projected drain chart to ensure your battery will last through the full hour of math testing.
Key Factors That Affect ACT Approved Calculators Results
- CAS Functionality: This is the #1 reason calculators are banned. If it can factor polynomials or simplify radicals symbolically, it's likely prohibited.
- Power Source: Rechargeable batteries in ACT approved calculators should be charged the night before. Alkaline batteries should be fresh.
- Screen Settings: High-resolution color screens on models like the TI-84 Plus CE ACT consume significantly more power at max brightness.
- Keyboard Layout: Calculators with QWERTY (typewriter-style) keyboards are not allowed.
- Wireless Capabilities: Any device that can communicate via Bluetooth, Infrared, or Wi-Fi is strictly prohibited.
- Paper Tape/Printing: Old-school calculators that print on paper or have "noisy" keys are not permitted in the quiet testing environment.
Frequently Asked Questions (FAQ)
The TI-Nspire (non-CAS) is allowed, but the TI-Nspire CAS is on the prohibited calculators ACT list.
Yes, the ACT calculator policy allows you to bring a backup, but only one may be on your desk at a time.
No, scientific calculators for ACT are perfectly fine and often easier to use for basic operations.
Proctors will not provide batteries or a spare calculator. This is why checking your ACT approved calculators' battery life is vital.
Most Casio models, like the Casio fx-9750GIII ACT, are approved as long as they don't have CAS.
Absolutely not. Phones, tablets, and any device with internet access are strictly prohibited.
Many educators consider it the gold standard for ACT approved calculators due to its user-friendly interface and long battery life.
The ACT does not require you to clear memory, but you cannot use pre-stored notes or programs that simplify the test's core challenges.
Related Tools and Internal Resources
- Official ACT Calculator Policy – The latest rules directly from the source.
- Best Graphing Calculators for Students – A comparison of top-rated models.
- Scientific Calculators Guide – Affordable alternatives for test day.
- Prohibited Calculators List – Models you must avoid at all costs.
- ACT Test Day Checklist – Everything you need to bring besides your calculator.
- Calculator Battery Maintenance – How to ensure your device stays powered.