Casio Calculator - Free Online Casio fx-9750GIII Graphing Calculator
Use this free online graphing calculator inspired by the Casio fx-9750GIII 3rd edition. Graph up to three functions simultaneously, solve quadratic and cubic equations, run full statistical analysis, and use a built-in scientific calculator directly in your browser with no download or login required.
What is this online graphing calculator?
This is a free browser-based graphing calculator that replicates the core modes of the Casio fx-9750GIII 3rd Edition graphing functions, solving equations, statistics analysis, and scientific calculations. It is designed for students who need an online graphing calculator for homework, exam preparation, or when their physical device is unavailable.
Online Graphing Calculator
Syntax: use * for multiply, ** for power, sin(), cos(), tan(), sqrt(), log(), ln(), abs(), pi, e. Example: sin(x)*2 or x**3-3*x
Casio fx-9750GIII 3rd Edition Full Details, Specs and What It Can Do
The Casio fx-9750GIII is a third-generation graphing calculator for high school and college mathematics. It handles graphing, statistics, matrices, equation solving, and scientific calculations. The 3rd edition adds Python programming, USB connectivity, and an updated natural display. It costs approximately $40–$65, far less than competing graphing calculators, and is approved for major standardized tests including the SAT, ACT, and AP exams.
Key specifications of the Casio fx-9750GIII
| Specification | Detail |
|---|---|
| Display | 64 × 128 pixel dot matrix LCD |
| Memory | 61KB RAM storage |
| Graph functions | Up to 20 simultaneous functions |
| Power | 4 × AAA batteries (approx. 200 hours) |
| Connectivity | Mini-USB (3rd edition) |
| Programming | BASIC + Python (3rd edition) |
| Dimensions | 74 × 18.6 × 176.5 mm |
| Weight | ~150g with batteries |
| Exam approval | SAT, ACT, PSAT, AP, IB |
| Retail price (US) | Approximately $40 – $65 |
What modes the fx-9750GIII includes
- RUN-MAT: standard calculation mode with matrix support the equivalent of the Scientific mode in this online calculator
- STAT: single-variable and paired-variable statistics with regression types including linear, logarithmic, exponential, power, and quadratic
- GRAPH: rectangular, polar, and parametric function graphing with up to 20 stored functions
- TABLE: generates a table of function values for a given input range and step
- EQUA: simultaneous equations (up to 6 unknowns) and polynomial equations up to degree 6
- PRGM: program storage and execution in BASIC and Python (3rd edition)
- CONICS: dedicated mode for graphing conic sections like circles, ellipses, hyperbolas, parabolas
Casio fx-9750GIII vs TI-84 Honest Comparison for Students
Is the Casio fx-9750GIII the same as the TI-84?
No. They are completely different calculators from different manufacturers Casio versus Texas Instruments. However, they serve the same mathematical purposes, are approved for the same standardized tests, and handle the same curriculum topics. The most significant practical difference for most students is price: the fx-9750GIII typically costs 40–60% less than the TI-84 Plus.
| Feature | Casio fx-9750GIII | TI-84 Plus CE |
|---|---|---|
| Price (approx.) | $40 – $65 | $100 – $130 |
| Display | 64×128 px monochrome | 320×240 px color |
| Programming | BASIC + Python | TI-BASIC + Python (newer versions) |
| Battery | 4 × AAA (removable) | Rechargeable Li-ion |
| Graph functions | Up to 20 | Up to 10 |
| Exam approval | SAT, ACT, AP, IB | SAT, ACT, AP, IB |
| Interface style | Menu-driven, function keys | Menu-driven, app-based |
| Learning curve | Moderate | Moderate (widely taught in US schools) |
| School adoption | Less common in US | Very common in US schools |
The one practical disadvantage of choosing Casio over TI-84 in the US
Most US math teachers teach calculator steps using the TI-84 because it is the dominant device in American schools. If your class uses TI-84 walkthroughs and you own a Casio, you need to translate the steps yourself since the menu structure and key layout differ. The math is identical only the button sequence changes. If you are self-studying or outside the US, this disadvantage disappears almost entirely.
Can You Use a Graphing Calculator as a Scientific Calculator?
Yes, completely. A graphing calculator includes every scientific calculator function trigonometry, logarithms, exponentials, roots, factorials, combinations, permutations, complex numbers, and unit conversions in addition to its graphing capabilities. On the fx-9750GIII, the RUN-MAT mode is a full scientific calculator. The graphing functions are simply additional modes you access from the main menu.
What scientific calculator functions the fx-9750GIII handles
Trigonometry
- sin, cos, tan and their inverses
- Degree, radian, and gradian modes
- Hyperbolic functions (sinh, cosh, tanh)
Logarithms and Exponentials
- log (base 10)
- ln (natural log)
- eˣ and 10ˣ power functions
Number Operations
- Factorial (n!)
- Permutations (nPr)
- Combinations (nCr)
Complex Numbers
- Operations in rectangular form (a + bi)
- Conversion between rectangular and polar
- Argument and modulus
Exam rule important note
Some standardized tests allow scientific calculators but not graphing calculators for example, some specific SAT sections or employer aptitude tests. The Casio fx-9750GIII is classified as a graphing calculator. If a test permits only scientific calculators, bringing a graphing calculator regardless of whether you use its graphing functions may violate the testing policy. Always check the specific exam's permitted calculator list.
How to Use the Casio fx-9750GIII? A Practical Quick-Start Guide
This guide covers the operations students use most often, translated from the physical calculator to this online version.
Graphing a function
Select the Graph mode
On the physical calculator: from the main menu, press the function key under GRAPH. On this online calculator: click the "Graph" mode tab above.
Enter your function
Type your expression using x as the variable. Use ** for exponents (x**2 means x²), * for multiplication, and standard function names: sin(x), cos(x), log(x), sqrt(x). Example: x**2 - 4*x + 3
Set the View Window if needed
The default window shows x and y from −10 to 10. If your function values fall outside this range, use "Show Window Settings" and enter appropriate bounds. For trigonometric functions, use the "Trig" preset (±2π on x, ±2 on y).
Read intersection and trace points
On the physical calculator, press F5 (G-Solv) to find roots, intersections, maxima, and minima. On this online version, use the Equation mode to find roots algebraically, or read values from the graph by eye.
Common expressions and their syntax
| What you want | Type this | Example |
|---|---|---|
| x squared | x**2 | x**2 + 3*x - 4 |
| x cubed | x**3 | x**3 - 2*x |
| Square root | sqrt(x) | sqrt(x + 1) |
| Sine | sin(x) | 2*sin(x) |
| Natural log | ln(x) | ln(x) + 2 |
| Log base 10 | log(x) | 3*log(x) |
| e to the power x | e**(x) | e**(0.5*x) |
| Absolute value | abs(x) | abs(x - 2) |
| Pi | pi | sin(pi*x) |
Price of the Casio fx-9750GIII and Where to Buy It
The Casio fx-9750GIII 3rd Edition typically retails between $40 and $65 USD depending on the retailer and any ongoing promotions. This makes it one of the most affordable approved graphing calculators available, typically costing 40–60% less than the TI-84 Plus which usually sells between $100 and $130.
Amazon
Usually lowest price; check fulfilled by Amazon vs third-party sellers for genuine units
Walmart (in-store and online)
Stock varies seasonally; back-to-school season often brings price drops
Best Buy
Available in store for in-person pickup; useful for same-day needs
Casio Education (edu.casio.com)
Bulk pricing available for schools; also sells software emulators
eBay / second-hand
Significant savings possible on used units; verify the GII vs GIII model number before buying
GII vs GIII make sure you buy the right one
Older listings on marketplaces often show the fx-9750GII (second generation) at lower prices. The key differences are: the GIII has a USB mini port and Python support; the GII does not. If your course requires Python programming or USB data transfer, verify the listing shows the GIII (Roman numeral III) before purchasing.
Common Mistakes Students Make with the Casio fx-9750GIII
Wrong angle mode for trigonometry
The calculator defaults to degrees. If your problem uses radians as most calculus and higher-level problems do — you need to change the angle unit in Setup (SHIFT → MENU). Using degrees when radians are expected is the most common source of wrong trigonometric answers on this calculator.
Forgetting to multiply explicitly
The calculator requires an explicit multiplication sign. Writing 2x is not recognized you must write 2*x. This catches many students who are used to pencil-and-paper notation where juxtaposition implies multiplication.
View window set too large or too small to see the curve
If you graph a function and see nothing on screen, the function's values likely fall outside your current window range. Use the ZOOM function on the physical calculator or adjust xMin/xMax and yMin/yMax in the Window Settings on this online version.
Confusing log and ln
On the Casio fx-9750GIII, the LOG key computes log base 10, and the LN key computes the natural logarithm (base e). This matches mathematical convention but catches students who assume LOG always means natural log as it sometimes does in certain science contexts.
Not saving work before the screen times out
The physical calculator screen turns off after a set period of inactivity to save battery, but memory is retained. On this online calculator, values are held in browser memory for the session only. Downloading the result as CSV or noting key values before closing the tab is good practice.
Frequently Asked Questions
Graph Examples
Function Syntax Reference
fx-9750GIII at a Glance
Calculator Features
Function Grapher
Plot 3 functions with custom window settings
Scientific Calculator
Full scientific mode with trig, log, complex
Statistics Analysis
Mean, median, std dev, regression
Equation Solver
Quadratic, cubic, simultaneous equations
Fahad Ahmad
Founder of CalculatorsKit · Full-Stack JavaScript Developer · SEO & Digital Product Creator
Fahad Ahmad is the founder of CalculatorsKit and a full-stack JavaScript developer with more than 10 years of experience building modern web applications and online tools. He specializes in developing fast, accurate, and user-friendly calculators that help people make informed decisions in finance, health, education, business, mathematics, construction, and everyday life.
Every calculator published on CalculatorsKit is carefully researched, tested, and designed for accuracy and ease of use. Using modern technologies including Next.js, React, Tailwind CSS, and Shadcn UI, Fahad focuses on creating privacy-friendly tools that work instantly in the browser without requiring downloads or registration.
In addition to building calculators, Fahad writes educational articles that explain formulas, calculation methods, financial concepts, and practical examples in simple language so students, professionals, and everyday users can better understand the results they receive.