Sci Cal for 991ES PLUS and 570ES PLUS
Your sci cal is not always beside your notebook. CalcES gives you a free scientific calculator with ES PLUS and EX-style keypads, so you can practise a sequence before repeating it on your own handheld. Fractions and roots appear as written in a textbook, and the result can be viewed in exact or decimal form. For learners whose handheld is a “Casio scientific calculator” or “scientific calculator Casio,” CalcES provides familiar-style practice whether you call it a sci cal or a scical.
Keep the sequence while you study
In senior-high maths, a single exercise may move through fractions, powers, logarithms and trigonometry. Enter the expression on the keypad, then return to it in the history if you need to check where a sign changed. For a quadratic equation, inspect its roots and compare them with the method in the CalcES quadratic Guide. When the problem calls for an integral, check the integration rule in your course notes before you calculate.
For engineering coursework or board review at home, you can switch between degrees and radians, store a value for a later step, and select engineering notation for a large or small result. The calculator also handles systems of equations, complex numbers and matrix operations such as determinant, inverse and row reduction. A saved line in the history lets you revisit a calculation instead of typing the entire problem again.
Which keypad matches your handheld?
The fx-991ES PLUS and fx-570ES PLUS use the ES PLUS keypad family. Choose that keypad when practising with an fx-991ES PLUS or fx-570ES PLUS. The EX keypad is available for an fx-991EX, while ClassWiz has its own CW-style keypad. Choose the family you actually use to get the familiar keys, layout and way of entering calculations.
CalcES is an independent MathDa product and is not affiliated with or endorsed by Casio. Casio and the model names here are trademarks of their respective owners.
When the answer needs more work
If a result is not enough, open the built-in Tales Math Solver for the steps of a supported problem. It opens beside the keypad on a wide screen or as a sheet on a phone. If the question asks what a function looks like, use the Graph tab or the graphing calculator to draw it. Tap a curve to inspect an axis crossing or the intersection with another curve.
You can also take a photo, upload an image or draw a formula. Check the editable expression after it is read before calculating; a handwritten minus sign or decimal mark is worth a second look. That habit matters more than any shortcut when you are preparing for a timed paper.
Frequently asked questions
Does CalcES work like an fx-991ES PLUS, fx-570ES PLUS or ClassWiz?
CalcES supports ES PLUS, EX and CW-style keypads with familiar keys for fractions, equations, trigonometry and other common calculations. Choose the family your handheld belongs to and practise in the layout you know. CalcES is independent and is not affiliated with Casio.
Can I use this website during a board examination?
No. Use it for practice before the exam. Follow the examining body's current equipment rules and bring a permitted handheld to the testing room.
Does this sci cal cost anything or need an account?
The calculator is free to use in your browser without an account. Sign in only if you want your calculation history on another device.
Can I graph a function or see solution steps?
Yes. The Graph tab plots functions and equations. Tales Math Solver opens from a calculation for supported step-by-step problems.
About CalcES
CalcES is a MathDa tool for studying and checking calculations. Confirm critical answers and rounding rules with your course materials or your own handheld.