Office Calculators: what Claude and GPT would buy

Two AI models chose on their own, with no web access. Nobody tested these products: this is what each one says, and how to check it.

Claude and GPT choose the same product: Casio MS-80B

In Office Products, Claude and GPT choose the same brand in 2 of 7 categories.

Claude Opus 5.5 · October 28, 2026

Casio MS-80B

A compact, dual-powered desktop calculator with tax and markup keys that covers most everyday office arithmetic without taking up desk space.

Not for: Anyone who needs a paper audit trail, time-value-of-money functions, scientific notation, or more than 8 digits for large ledger figures.

GPT 6.1 Sol · November 10, 2026

Casio MS-80B

Large display, comfortable keys, and solar power with battery backup make it a practical choice for everyday office calculations.

Not for: Graphing, advanced scientific calculations, or printed calculation records.

Which one fits you

pocket or drawer calculator

Casio SL-300SV

A thin, solar-powered wallet-size calculator for quick sums away from the desk.

Not for: People who key in numbers all day and need full-size keys or a tilted display.

Check before you buy

Calculator type matches the task. Use a basic calculator for totals and tax, a printing calculator when you need a paper record, a financial model for loans, NPV and IRR, and scientific or graphing models for technical math. Buying the wrong type is the most common mistake in this category, and no single type covers all of these tasks well.
Digit capacity. 8 digits for casual use; 10 to 12 digits for accounting, payroll or inventory figures. With too few digits, large totals overflow or are shown in a truncated form.
Power. Prefer dual power (solar plus a battery backup). Solar-only models fade or blank out under dim office lighting.
Business keys. Look for tax+/tax−, MU (markup), GT (grand total) and independent memory keys if you price or invoice. These keys replace multi-step manual calculations that are easy to get wrong.

Where to find Casio MS-80B

Walmart
Target
Best Buy

Shops seen in search results on November 5, 2026. A shop missing here may sell it too. Nothing was checked by a person.

Brands that matter

Casio: The broadest range across basic, printing, scientific and graphing calculators.
Canon: Strong in desktop and printing calculators with good key feel.
Sharp: Long-running printing and desktop office lines.
Texas Instruments: The default brand for financial, scientific and graphing calculators in schools and finance.
HP: Known for the RPN financial calculators that many finance professionals still use.

What to avoid

Solar-only models for desks under dim light.
No-name calculators with mushy membrane keys for heavy data entry.
Buying a scientific or graphing model when all you need is tax and totals.

Questions

Which type do I need for bookkeeping?

A 12-digit desktop calculator, or a printing calculator if you need a tape to check entries against receipts.

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