Free online scientific calculator with trigonometry, logarithms, exponents, square root, factorial, and memory functions. No download or sign-in needed — use this full-featured trigonometry calculator directly in your browser on any device.
Click buttons or type on your keyboard
This free scientific calculator runs directly in your browser — no app download, no account, no plugins. It covers every function you'd find on a physical TI-84 or Casio FX-115ES: sine, cosine, and tangent (and their inverses), natural log (ln), base-10 log (log), square root, cube root, exponents (x^y), factorials, and the mathematical constants π and e. The memory functions (MS to store, MR to recall) let you save intermediate results and use them in multi-step calculations. Keyboard input is fully supported — type numbers and operators directly, hit Enter to evaluate, Backspace to delete, and Escape to clear. All trigonometric functions use degrees, consistent with US high school and college math curricula.
A free online scientific calculator is genuinely useful for students in algebra, pre-calculus, trigonometry, statistics, and physics courses — especially for checking homework answers or working through problems on a laptop where a physical calculator isn't handy. Engineers use sine, cosine, and tangent daily for structural load calculations, circuit analysis, and signal processing. The natural logarithm (ln) and base-10 log (log) appear in chemistry (pH calculations), finance (continuous compounding), and information theory. Whether you're a high school student working on the unit circle, a college student taking Calculus 2, or an engineer double-checking a quick computation, this online scientific calculator handles it — no download required.
sin, cos, tan and their inverses (arcsin, arccos, arctan) are essential for geometry, physics, and engineering. All functions use degrees. Example: sin(30°) = 0.5, cos(60°) = 0.5, tan(45°) = 1. The Pythagorean identity sin²(x) + cos²(x) = 1 always holds.
log(x) is the base-10 logarithm — used in chemistry for pH = −log[H⁺]. ln(x) is the natural log (base e) — used in continuous compound interest: A = Pe^(rt). Exponents (x^y) let you compute compound growth: $1,000 at 7% for 10 years = 1000 × 1.07^10 = $1,967.
Square root (√) and cube root (∛) are common in geometry and physics — the hypotenuse of a 3-4-5 right triangle is √(9+16) = √25 = 5. Factorials (n!) are used in probability and combinatorics: 5! = 120 possible orderings of 5 items.
Use MS (Memory Store) to save a result, MR (Memory Recall) to reuse it. Keyboard: type numbers and +−×÷, press Enter to evaluate, Backspace to delete the last character, Escape to clear everything. Parentheses ( ) let you control order of operations in complex expressions.
A scientific calculator applies the standard order of operations, and most disputed results trace to that rather than to arithmetic error. The convention — parentheses, exponents, multiplication and division left to right, then addition and subtraction left to right — is a notational agreement rather than a mathematical truth, which is why ambiguous expressions like 6÷2(1+2) genuinely divide opinion and why competent notation avoids them. The other frequent source of wrong answers is angle mode: trigonometric functions expect radians or degrees depending on a setting that produces plausible but incorrect results when wrong.
Order: Parentheses → Exponents → Multiplication/Division (left to right) → Addition/Subtraction (left to right)Trigonometric functions require the correct angle modelog is base 10; ln is base e (2.71828)Implicit multiplication has no universal precedence — parenthesise insteadwhere:
Assumptions: Floating-point arithmetic is not exact: 0.1 + 0.2 does not equal 0.3 in binary representation. Calculators hide this by rounding the display, which is why a result can appear correct and fail an equality test.
Apply precedence strictly, then show what left-to-right evaluation would give.
Result13 — not the 11 that left-to-right evaluation gives
Note that multiplication does not outrank division: they share a level and are evaluated left to right, so 12 ÷ 4 × 3 is 9, not 1. Reading "×" as binding tighter than "÷" is the single most common precedence mistake.