Scientific Calculator

🔬 Scientific Calculator 991 Pro — The Ultimate Calculator for Students & Engineers

The most powerful scientific calculator on Android. Designed for students, engineers, and professionals who demand precision, speed, and advanced mathematical tools — all in one elegant app.

Modeled after the legendary Casio 991 series, Scientific Calculator Pro goes far beyond basic math. From simple arithmetic to symbolic calculus, graphing, matrix algebra, and equation solving — this is the only calculator you'll ever need.

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🧮 MULTIPLE CALCULATOR MODES
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◉ Basic Calculator — Fast, clean arithmetic with percentage, memory, and sign toggle.

◉ Scientific Calculator 991 — Full Casio-style layout with sin, cos, tan, log, ln, powers, roots, π, Euler's e, factorials, combinations (nCr), permutations (nPr), and more.

◉ Advanced Calculator — Hyperbolic functions (sinh, cosh, tanh and inverses), absolute value, inverse trig, and high-precision calculations.

◉ Graphing Calculator 84+ — Plot any function, zoom in/out, touch to trace the curve, find roots (zeros), local minimums and maximums with one tap.

◉ Calculus Calculator — Compute numeric derivatives and definite integrals. Enter any expression, set your bounds, get instant results.

◉ Matrix & Vector Calculator — 2×2 and 3×3 matrix operations: addition, multiplication, determinant, inverse, and transpose.

◉ Equation Solver — Solve quadratic and cubic equations with step-by-step coefficient input.

◉ Fraction Calculator — Add, subtract, multiply, divide fractions; simplify results; convert decimal to fraction and back.

◉ Number Theory — GCD, LCM, prime factorization, combinations, permutations, and random number generation.

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📐 MATH & PHYSICS FORMULAS
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Instant access to a comprehensive formula library:
• Algebra, Geometry, Trigonometry, Calculus
• Physics: Kinematics, Forces, Energy, Waves, Electricity
• Organized by category — find what you need in seconds
• Perfect for studying and quick reference during exams

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🔄 UNIT CONVERTER
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Convert between dozens of units across:
Length • Area • Volume • Mass • Speed • Temperature • Pressure • Angle
Metric ↔ Imperial — instant conversion as you type.

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📚 TIPS & TRICKS GUIDE
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New to scientific calculators? Built-in tips and usage guides walk you through:
• How to use every function
• Practical calculation examples
• Formulas explained clearly
• Ideal for high school, university, and engineering students

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🔐 PRIVATE HIDDEN SECURE VAULT
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Keep your private files safe. Behind the calculator lies a fully encrypted private vault — protected by your PIN or fingerprint.

• Store private photos, videos, and notes
• Files are hidden from your gallery and file manager
• PIN-protected with optional biometric unlock
• Auto-locks when you leave the app
• Decoy mode for extra security

Your private files never leave your device.

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⭐ MORE FEATURES
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✓ 100% Offline — no internet required for calculations
✓ Calculation History — review and pin your last 20 calculations
✓ Copy & paste results — tap any result to copy instantly
✓ Dark theme — easy on the eyes day and night
✓ Ad-free experience with Premium ($1.99/month)
✓ All calculator features are completely FREE

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👑 GO PREMIUM
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Upgrade to Premium for just $2/month and enjoy:
• Zero ads across all screens
• Managed via Google Play — cancel anytime

All features — calculators, vault, formulas, converter — are free for everyone.

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Scientific Calculator Pro is built for students, university learners, engineers, scientists, and anyone who needs a reliable, professional-grade calculator on their Android device.

Download free.