excelerAItor
excelerAItor Scientific Calculator
A free online scientific and graphing calculator that runs in your browser: trigonometry, logarithms, statistics, probability distributions, and graphing for up to six functions. Free, with no signup.
What it can do
- Scientific functions: sin, cos, tan and their inverses, ln, log, ex, 10x, square and cube roots, powers, absolute value, factorials, nCr and nPr.
- Graphing: enter up to six functions (Y1–Y6), adjust the window and zoom, trace along a curve, and view a table of values.
- Statistics and probability: one-variable statistics, normal, binomial, geometric, and t distribution functions.
- Memory and history: reuse your last answer with ANS, store values with STO→, and scroll back through earlier entries.
- Keyboard support: type expressions directly, with Enter to calculate and Backspace to delete.
How to graph a function
- Press Y= and enter a function such as X^2/4. To graph sin(X), first open MODE and choose Radian; in Degree mode it looks nearly flat on the default window.
- Press GRAPH to plot it.
- Use WINDOW or ZOOM to change the view, and TRACE to follow the curve.
Frequently asked questions
Is this calculator really free?
Yes. It is free to use with no account or signup. Calculations run in your browser.
How do I switch between degrees and radians?
Open the MODE screen to change the angle mode. The current mode (DEG or RAD) is shown at the top of the display.
What do the 2ND and ALPHA keys do?
Press 2ND to use the secondary function printed above a key, such as sin⁻¹ above sin. ALPHA gives access to letter variables.
Can I use it on an exam?
That depends on your instructor and institution, since calculator rules differ. Check your course policy before relying on any calculator in an exam.
excelerAItor turns your own notes into quizzes and flashcards, with spaced repetition so missed material comes back.
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