Casio FX-991ES PLUS 2nd Edition Scientific Calculator: Specs, Uses and Price in Sri Lanka (2026)

What is the Casio FX-991ES PLUS 2nd Edition?

The Casio FX-991ES PLUS 2nd Edition is a non-programmable scientific calculator with 417 built-in functions and a Natural Textbook (Natural-V.P.A.M.) display that shows fractions, roots and integrals exactly as they appear in a printed maths book. It is built for O/L and A/L students, undergraduates and working engineers who need everything from basic trigonometry to matrix, vector and calculus operations in one pocket-sized device. At Officestationery.lk it is stocked at Rs6,800.00 (with a wholesale price of Rs6,500.00), making it one of the most capable calculators in its class available in Sri Lanka.

Key specifications at a glance

According to Casio’s official product specification, the FX-991ES PLUS 2nd Edition packs professional-grade hardware into a slim shell that fits any pencil case:

• 417 built-in functions covering trigonometry, logarithms, statistics, complex numbers, matrices, vectors and calculus.
• Natural Textbook (Natural-V.P.A.M.) dot-matrix display with a 10-digit mantissa plus 2-digit exponent (10 + 2 digits).
• 40 physical constants and 20 metric conversion pairs built in for physics, chemistry and engineering work.
• Solar + battery (two-way) power, so it runs on light when available and falls back to the battery in low light.
• Compact 161.5 × 77 × 11.1 mm body weighing just 95 g, including the hard slide-on cover.

Casio describes the display as a system that lets you enter and view calculations the way they are written on paper:

“Features Natural Textbook Display format for displaying equations and calculation result just as they appear in textbooks.”

Casio, fx-991ES PLUS-2 product page

Who is this calculator for?

Students (O/L, A/L and university)

The 417-function range covers the full Sri Lankan A/L Combined Mathematics, Physics and Chemistry syllabus, plus most first- and second-year university modules. Because the model is non-programmable, it is accepted in many exam halls where programmable graphing calculators are not allowed. Always confirm the rules with your exam board before sitting a paper.

Engineers and technical professionals

With 40 built-in physical constants, 20 metric conversions, complex-number arithmetic, base-n (binary/octal/hexadecimal) calculation and numerical integration and differentiation, the FX-991ES PLUS 2nd Edition handles routine site and lab calculations without a laptop.

Why scientific calculators are still a smart buy

Even with phone apps everywhere, dedicated scientific calculators remain a growing global category. The global scientific calculator market is estimated at about USD 0.44 billion in 2026 and is projected to reach roughly USD 0.7 billion by 2035, while a separate analysis estimates the segment is growing at a 5.80% CAGR from 2023 to 2030. A big driver is simple: exam boards bar internet-connected devices, so a stand-alone unit like the FX-991ES PLUS remains essential.

Casio scientific calculator price list in Sri Lanka

Officestationery.lk stocks several genuine Casio scientific calculators. Prices below are indicative and may change; check the product page for the current figure before ordering.

• Casio FX-991ES PLUS 2nd Edition Non Programmable Scientific Calculator – Rs6,800.00 (wholesale Rs6,500.00)
• Casio FX-991MS Scientific Calculator – Rs5,800.00
• Casio Scientific Calculator FX-100MS – Rs5,600.00
• Casio FX-991EX ClassWiz Non-Programmable Scientific Calculator – Rs9,800.00

FX-991ES PLUS vs FX-991EX ClassWiz: which should you pick?

Both are non-programmable Casio models. The FX-991ES PLUS 2nd Edition (Rs6,800.00) uses the proven Natural-V.P.A.M. dot-matrix display and 417 functions, and it is the lower-cost option. The newer FX-991EX ClassWiz (Rs9,800.00) adds a higher-resolution display, a faster processor, more functions and QR-code output. For standard A/L and undergraduate study the FX-991ES PLUS is usually enough; choose the ClassWiz if you want the latest hardware and spreadsheet-style features.

Buying genuine in Sri Lanka

Counterfeit scientific calculators are common, and a fake unit can give wrong answers in an exam. Buying from an established stationery retailer such as Officestationery.lk means you receive a genuine Casio unit with the manufacturer’s warranty, delivered island-wide. If you are buying for a school or tuition class, the wholesale price of Rs6,500.00 applies on bulk orders.

Frequently asked questions