Last updated: October 2026
How to use this scientific calculator
Short answer: type a full expression such as sin(30)+sqrt(16) with your keyboard, or tap the buttons — then press = (or Enter). Parentheses nest as deep as you like, and pressing an operator right after a result continues the calculation from it.
Everything runs on a real expression parser (no shortcuts or approximations): operator precedence, right-associative powers (2^3^2 = 512), factorials, and unary minus all behave the way a physical calculator does. Floating-point dust is cleaned automatically — 0.1+0.2 shows 0.3, not 0.30000000000000004.
Degrees vs radians — which mode do you need?
Short answer: use DEG for school trigonometry (sin(30°) = 0.5) and RAD for calculus and programming (sin(π/2) = 1). The toggle sits top-left of the keypad; the mode applies to sin, cos, tan and their inverses.
Mixing up modes is the single most common scientific-calculator mistake — an answer that's "close but wrong" almost always means the mode is off. The calculator shows the active mode at all times so you can check before you trust a trig result.
Common functions at a glance
Worked examples
Hypotenuse: a ladder problem needs √(3² + 4²). Type sqrt(3^2+4^2) → 5.
Trig identity check: sin(30)^2+cos(30)^2 → 1 in DEG mode — a good sanity check that your mode is right.
Compound growth: 1000×1.05^10 → type 1000*1.05^10 → 1628.89462678.
Chaining with Ans: compute sqrt(2), then type Ans*Ans → 2 — no retyping.
Who is this scientific calculator for?
Students working through algebra, trigonometry, and precalculus homework; engineers and scientists running quick trig, log, and exponent calculations; and teachers demonstrating how expressions are evaluated in front of a class.
The key layout and functions mirror the classroom scientific calculators you're already used to — models like the Casio fx-991 or the TI-30 series — so nothing here will feel unfamiliar. One honest caveat: school exams that require an approved physical calculator still need the handheld. This page is for practice, homework, and real-world work.
Frequently asked questions
How do you use a scientific calculator online?
Type a full expression like sin(30)+sqrt(16) using your keyboard, or tap the buttons — then press = (or Enter). The calculator supports parentheses, nesting, and chaining: after a result, pressing an operator continues from it. Use DEG/RAD to switch angle mode and Ans to reuse your last answer.
What is the difference between DEG and RAD mode?
DEG mode measures angles in degrees (sin(30) = 0.5); RAD mode measures them in radians (sin(π/2) = 1). School trigonometry almost always uses degrees, while calculus and programming use radians. The toggle at the top of the calculator switches modes instantly — check it before trusting a trig answer.
How do you calculate sin, cos and tan on a scientific calculator?
Tap sin, cos or tan, type the angle, close the parenthesis and press =. For example, sin(30) = 0.5 in DEG mode. The inverse functions asin, acos and atan work the same way: asin(1) = 90° in DEG mode.
How do you do exponents and roots on a scientific calculator?
Use xʸ (the ^ key) for any power: 2^10 = 1024. x² squares instantly. For roots, tap √ for square root and ∛ for cube root — or use fractional powers, e.g. 27^(1/3) = 3. 1/x computes the reciprocal of the current entry.
What does the Ans button do?
Ans inserts your last computed result into the current expression, so you can chain calculations without retyping: compute sqrt(2), then type Ans*Ans to square it. Memory keys MC/MR/M+/M− give you a separate stored value that survives across calculations.
Why does the calculator say Error?
Error means the math is undefined or out of range: dividing by zero, sqrt of a negative number, log or ln of zero or a negative, asin/acos outside −1 to 1, or a result too large to display (overflow). Fix the input and calculate again — nothing is saved or sent anywhere.
Is my data private?
Completely. Every calculation happens locally in your browser with JavaScript — your expressions and results are never sent to a server, stored, or tracked in any way.
What are the keyboard shortcuts?
Digits and operators (+ − * / ^ % ( ) !) type straight into the expression, and function names like sin, cos, and log can be typed as text. p inserts π, and x works as multiplication. Enter (or =) evaluates, Backspace deletes the last entry, and Escape clears everything.
How do the memory keys M+, M−, MR, and MC work?
M+ adds the current value to memory, M− subtracts it, MR recalls the stored value into your expression, and MC clears memory back to zero. Memory survives across calculations — unlike Ans, which only holds your single most recent result.
How does the % key work?
The % key divides the last number you typed by 100, turning it into its decimal value. For example, typing 80*20% computes as 80×0.2 = 16 — handy for finding a percentage of a number without typing the decimals yourself.
Does this scientific calculator work on mobile phones?
Yes. The keypad and display are built for touch, so it works in any modern phone or tablet browser as well as on desktop. There's nothing to install — just open the page and start calculating.
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