Scientific Calculator

About This Scientific Calculator

This free online scientific calculator handles everything a handheld TI or Casio does — basic arithmetic, exponents and roots, trigonometric functions, logarithms, factorials, and memory storage — directly in your browser, with no app to download and nothing to buy. It's built for students working through algebra, trigonometry, and calculus homework, as well as engineers, scientists, and anyone who needs more than the four basic operations a default phone calculator offers. Every keystroke is evaluated instantly, and the running expression stays visible above the result so you can check your work before pressing equals.

Functions It Supports

The keypad covers the full set of scientific operations you'd expect from a graphing-class device. Arithmetic includes addition, subtraction, multiplication, division, and percentages, plus parentheses for grouping so the calculator respects the correct order of operations (PEMDAS). For powers and roots you get square (x²), arbitrary exponents (xʸ), square root, cube root, and the reciprocal (1/x). Trigonometric functions include sine, cosine, and tangent, along with their inverses (sin⁻¹, cos⁻¹, tan⁻¹), accessible by pressing the 2nd key. Logarithmic functions include the base-10 logarithm (log), the natural logarithm (ln), and their inverses 10ˣ and eˣ. You also get the factorial (n!), the constants π and e, and a memory bank (M+, MR, MC) for storing intermediate results across a long calculation.

Degrees vs. Radians

One of the most common sources of wrong answers in trigonometry is using the wrong angle mode. This calculator defaults to degrees (DEG), the unit most students use in geometry and early trig, but you can toggle to radians (RAD) for calculus and physics work where angles are expressed in terms of π. As a quick check: sin(30) should equal 0.5 in degree mode, while sin(π/6) equals 0.5 in radian mode. If your trig answers look wildly off, the angle mode is almost always the culprit — confirm the DEG/RAD indicator before you calculate.

Worked Examples

To find the hypotenuse of a right triangle with legs of 3 and 4, you'd compute √(3² + 4²) — enter the expression and the calculator returns 5. To solve a compound-growth problem like 1000 × 1.05⁸, use the xʸ key to raise 1.05 to the 8th power, then multiply by 1000 for a result of about 1477.46. For a statistics problem requiring the number of ways to arrange 5 items, the factorial key gives 5! = 120. Each of these chains multiple operations, and because the expression line stays on screen, you can spot a misplaced parenthesis before it throws off the answer.

Keyboard Shortcuts

You don't have to click — the calculator has full keyboard support for fast entry. Type 0–9 and . for numbers, + − * / for the four operators, ^ for exponents, % for percent, and ( ) for grouping. Press Enter or = to evaluate, Backspace to delete the last character, and Escape to clear the entire expression. This makes the tool especially fast on a laptop, where you can work through a problem set without ever reaching for the mouse.

Frequently Asked Questions

• Is this scientific calculator free to use?
  Yes. It's completely free, requires no sign-up, and runs entirely in your browser. There are no usage limits and no app to install.
• Why is my trig answer wrong?
  The most likely cause is the angle mode. Check whether the calculator shows DEG or RAD and switch using the mode toggle. Degree mode expects angles like 90; radian mode expects values like π/2.
• How do I use the inverse trig functions?
  Press the 2nd key to switch sin, cos, and tan to their inverses (sin⁻¹, cos⁻¹, tan⁻¹). The button labels update to show the active function.
• Does it follow order of operations?
  Yes. The calculator evaluates full expressions using standard PEMDAS rules, so 2 + 3 × 4 returns 14, not 20. Use parentheses whenever you want to force a different grouping.