# MathDa

> MathDa makes free browser maths tools for students and teachers. Its main product is CalcES, an
> online scientific calculator whose keypads are modelled on the Casio scientific calculators
> students already own (ES PLUS, ClassWiz EX and ClassWiz CW families), with a graphing
> calculator, a step-by-step solver (Tales Math Solver), task guides and a learning blog.

## Key facts

- CalcES is free and runs in the browser on phones, tablets and computers. Nothing to install and
  no account needed to calculate or to graph.
- Keypads modelled on Casio handhelds: ES PLUS (e.g. fx-991ES PLUS, fx-570ES PLUS, fx-82ES PLUS),
  ClassWiz EX (fx-991EX, fx-570EX), ClassWiz CW (fx-991CW, fx-570CW) and regional models such as
  fx-580VN X. Visitors choose their model; the keys, SHIFT/ALPHA or menu layers and modes follow it.
- CalcES is an independent product of MathDa. It is not affiliated with, endorsed or certified by
  Casio; Casio and model names are trademarks of their owners. It is for study and practice — not
  for use in an exam room.
- Beyond the handheld: a larger screen, the result shown live while typing, exact and decimal
  forms (S⇔D on ES PLUS/EX keypads, FORMAT on CW), the last 100 calculations in history, photo or
  handwriting input of an expression, and sending a result to the graphing calculator.
- Calculation: fractions, roots and powers in textbook display; trigonometric, inverse and
  hyperbolic functions in degrees, radians or gradians, with degrees-minutes-seconds; logarithms in
  any base; scientific and engineering notation; 10 letter variables plus Ans and PreAns; CALC to
  re-evaluate a formula with new values.
- Equations: polynomial equations and inequalities of degree 2–5 (real and complex roots), linear
  systems with 2–6 unknowns, SOLVE for one unknown.
- Calculus: derivative at a point, definite integral, limits, Σ sums and Π products.
- Matrices up to 7×7, 2-D and 3-D vectors, complex numbers.
- Statistics with up to 999 data rows and 7 regression models; binomial, normal and Poisson
  distributions; a function table for f(x) and g(x); a spreadsheet (columns A–Z, 999 rows);
  base-N for signed 32-bit integers; 40 scientific constants and 40 unit conversions; an
  interactive periodic table of 118 elements.
- Graphing calculator: functions, equations and inequality regions, parametric and polar curves,
  sliders, points of interest (roots, extrema, intersections), tables, PNG and CSV export.
- Tales Math Solver shows step-by-step solutions for supported problems, in Vietnamese, German,
  Malay, Italian or English (other languages receive English steps). A few solves are free without
  an account; then it asks the visitor to sign in.

## Products

- [CalcES scientific calculator](https://mathda.com/calculator/): the online calculator, in English; other
  language versions are linked from each page (hreflang) and listed in the sitemap below.
- [Graphing calculator](https://mathda.com/calculator/graphing-calculator): plot functions, inequalities,
  parametric and polar curves.
- [Tales Math Solver](https://mathda.com/calculator/math-solver): step-by-step solutions for supported problems.
- [CalcES Guide](https://mathda.com/calculator/guide): task articles — solving a quadratic, a system of
  equations, a function table — on the reader's own keypad model.
- [CalcES Blog](https://mathda.com/calculator/blog): explanations of calculator results and school maths topics.

## Optional

- [Date, time and age calculators](https://mathda.com/tools/date-calculator): everyday calculators in 43 languages.
- [Unit converter](https://mathda.com/convert): conversions between units.
- [CalcES documentation](https://mathda.com/docs/calculator-usages/calces/): reference for CalcES features.
- [Function reference](https://mathda.com/docs/calculator-usages/symja/): one page per mathematical function.
- [Calculator sitemap](https://mathda.com/calculator/sitemap.xml): every indexable calculator, graphing, guide and
  blog page in every language.