Scientific Calculator Plus 991
NCalc & CalcES Calculator
Free · In-App Purchases
Trusted by 80M+ users across all platforms. NCalc: natural‑display scientific calculator with graphing, formula library & unit/currency converter.
NCalc — Powerful Scientific Calculator, Graphing, and Converter
NCalc combines a natural-display scientific calculator, advanced maths tools, a full graphing module (as 83/84 calculator), a large formula library, and a comprehensive unit and currency converter—designed for students, engineers, and anyone who loves maths.
◉ Main Calculator Features
- Natural display: Enter expressions exactly as in textbooks—fractions, roots, exponents, and more—see results as written on paper.
- Keyboard layout: Matches popular models for familiarity and speed: 115 ES Plus, 991 ES Plus, 300 ES Plus, and 991 EX.
- Symbolic and numeric modes: Perform exact fraction calculations or evaluate numerically when needed.
- Arbitrary‑precision integers: Work with very large integers without losing accuracy.
- Output types: Choose from fraction, mixed fraction, decimal, recurring decimal, degrees/minutes/seconds, and polar coordinates.
- Angle units: Degree, radian, and gradian (grade).
- Decimal formatter: Display numbers in normal, engineering, engineering SI, scientific, or fixed formats.
- Calculation history: Review and reuse past calculations with ease.
- Copy and paste support for fast data entry and sharing.
◉ Algebra, Calculus, and Core Maths
- Algebra calculations: Expansion, factorisation, simplification, and more.
- Calculus calculator: Derivatives, integrals, and limits of expressions.
- Complex number calculations: Arithmetic, polar/rectangular conversion, exponential, logarithms, powers, roots, and full trigonometric functions.
◉ Equations and Inequalities
- Equation solver: Solve general equations, plus dedicated solvers for quadratic, cubic, and quartic equations.
- System of equations solver: Solve systems with 2, 3, or 4 variables.
- Inequality solvers: Quadratic, cubic, and quartic inequalities with interval‑based solutions.
◉ Matrices and Vectors
- Operations: Addition, subtraction, multiplication for matrices and vectors.
- Advanced tools: Determinant, inverse, transpose, rank, eigenvalues, and eigenvectors.
◉ Statistics and Distributions
- Statistical calculation: Descriptive stats and regression calculation (including a regression plotter).
- Distribution calculation: Normal distribution, binomial distribution, Poisson distribution, t‑distribution, chi‑squared distribution, and F‑distribution.
◉ Number Bases and Formats
- Base‑N calculation: Effortlessly switch between binary, octal, decimal, and hexadecimal, with arithmetic in each base.
◉ Tables, Variables, and Custom Functions
- Table Generator: Generate value tables based on any expression and range.
- Calculator variables: Store values and reuse them across calculations.
- User‑defined functions: Create your own functions to streamline repetitive work.
◉ Built‑ins and Help
- Built‑in constants: A rich set of mathematical and physical constants.
- Built‑in documentation: Access helpful guidance anytime via the Help button.
◉ Formulae
- Extensive formulae collection: Maths and Physics formulae, clearly categorised—ideal for secondary school, sixth form/college, and university students.
◉ Unit Converter
- Currency Converter: Up‑to‑date exchange rates for quick conversions.
- 1,000+ unit conversions: Length, mass, time, energy, power, temperature, pressure, data, and more—organised for fast lookup.
◉ Auto-renewing subscription
You may purchase an auto-renewing subscription through an In-App Purchase.
• Auto-renewable subscription
• Your subscription will be charged to your AppStore account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period.
• Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your AppStore Account Settings after purchase
• Privacy policy and terms of use: https://ncalc-app.web.app/terms-of-services.html
Thanks for using NCalc! This update includes performance improvements, stability enhancements, bug fixes, UI refinements, and compatibility updates for the latest iOS versions to ensure a smoother, more reliable experience.
The developer, Tran Duy, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- User Content
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Size
- 184.3 MB
- Category
- Education
- Compatibility
Requires iOS 15 or later.
- iPhone
Requires iOS 15 or later. - iPad
Requires iPadOS 15 or later. - iPod touch
Requires iOS 15 or later. - Mac
Requires macOS 12.0 or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 50 more
- English, Albanian, Arabic, Armenian, Azerbaijani, Basque, Belarusian, Bengali, Bosnian, Bulgarian, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Kannada, Korean, Laotian, Latvian, Lithuanian, Macedonian, Malay, Malayalam, Oriya, Persian, Polish, Portuguese, Punjabi, Romanian, Russian, Serbian, Simplified Chinese, Slovak, Spanish, Swahili, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
13+
- 13+
- Infrequent
Cartoon or Fantasy Violence
Realistic Violence
Mature or Suggestive Themes
Contains
Advertising
- In-App Purchases
Yes
- Calculator Premium 49,00 kr
- Calculator month subscription 19,00 kr
- Calculator Pro 49,00 kr
- Calculator yearly subscription 39,00 kr
- Provider
Tran Duy
- Tran Duy has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
- Address
Binh Duc
An Giang
Long Xuyen 880000
Vietnam - Phone Number
+84 945482884 - Email
tranleduy1233@gmail.com
- Copyright
- © 2026 Duy Tran
