Is the Casio fx-991CW Allowed on the ACT?

iThe plain answer

Answer.

Approved

Yes. The Casio fx-991CW is approved for ACT Math based on the cited policy quote and the guide data showing a standalone scientific calculator that is not the CAS variant. This does not cover phone apps, emulators, or different model variants.

iiThe reasoning

Why this verdict.

Based on the cited policy quote, this verdict treats the Casio fx-991CW as approved for ACT Math because the official source permits the relevant calculator category unless a separate restriction applies. The calculator data describes the device as a scientific calculator, and the stored note says: ClassWiz scientific calculator with natural textbook display, equation tools, matrix tools, and no graphing or CAS feature. The decisive check here is conservative: this file relies on the physical model being standalone, non-CAS, and not a phone, tablet, computer program, or emulator. The verdict does not approve every model with a similar retail name, and it does not override proctor instructions on exam day. It simply connects the cited policy language to the features already recorded for this exact calculator.

iiiPrimary evidence

Official source.

Official source · 01ACT Calculator Policy

Based on the cited policy quote from ACT Inc., the relevant evidence is that the policy allows the calculator category used by the Casio fx-991CW while separate restrictions still apply. The stored calculator data describes this model as a standalone scientific calculator and records whether it has CAS. This note does not approve apps, emulators, future variants, or use outside the exam context described in the verdict.

“4-function, scientific, and graphing models are allowed, unless prohibited per the list above.”

ACT Inc.Accessed 2026·05·15

ivWhat to watch

Caveats.

Use the Casio fx-991CW only where ACT instructions permit calculator use, which this file summarizes as the mathematics test context.

Bring the standalone calculator, not a phone, tablet, smartwatch, laptop, browser tool, screenshot, emulator, or downloaded calculator app.

If test staff ask you to clear stored material, remove covers, inspect labels, or put away accessories, follow that local instruction.

Confirm the model is not a CAS variant and bring it charged or with reliable power, because a policy approval does not solve battery problems.

For planning, write down the exact model, color, serial-style label, borrowed owner, backup choice, charger, batteries, cover, and accessories before exam morning so no last-minute substitution changes the device being evaluated.

If you buy secondhand, avoid vague listings, regional editions, school bundles, modified firmware, missing labels, cracked screens, unreadable keys, or seller claims that cannot be matched to the authority's written policy.

vEquivalent models

Alternatives.

Casio

fx-991EX

Earlier ClassWiz scientific calculator with no graphing, no CAS, and dual solar plus battery power.

ScientificOpen file

Texas Instruments

TI-30XS MultiView

Non-graphing scientific calculator with a four-line display and no programmable or CAS feature.

ScientificOpen file

Texas Instruments

TI-36X Pro

Advanced scientific calculator with equation, statistics, and matrix tools, but no graphing or CAS feature.

ScientificOpen file

Reader questions

FAQ.

Q.01What exact policy point approves the fx-991CW?

Based on the cited policy quote, the calculator category is allowed unless a separate restriction applies. The stored calculator data identifies the Casio fx-991CW as a standalone scientific calculator and non-CAS. This page connects those recorded facts; it does not certify unrelated models, altered hardware, apps, or emulator copies.

Q.02What should I check before test day?

Check the physical label, power condition, case, accessories, and exact model name. If a model family has both CAS and non-CAS versions, do not rely on a short nickname or a marketplace title. Bring the calculator you practiced with, keep it ready for inspection, and avoid last-minute substitutions that have not been compared with the official policy.

Q.03Does this mean every similar calculator is allowed?

No. This verdict is limited to the Casio fx-991CW and ACT Math. A similar calculator can differ by CAS capability, wireless features, app dependency, keyboard layout, operating mode, or model family. Use the separate verdict for that exact calculator, or treat the device as unverified until the official source and stored calculator data can be matched.

Q.04What if the proctor or current policy page differs?

Follow the testing authority's current written policy and any valid test-day instruction. This site is an independent summary, with dates showing when the source was checked. If a proctor asks for a cover to be removed, stored material to be cleared, or a device to be put away, the practical exam-day answer is to comply and use an approved backup.

Cross-exam matrix