Scientific Calculator 🧮
Advanced online scientific calculator with trig, log, powers, memory, history, and keyboard support. Free — works like Casio and TI in your browser.
Free Scientific Calculator Online — Advanced Math for Students & Engineers
Our free online scientific calculator provides the full mathematical function set of a physical scientific calculator — trigonometric functions (sin, cos, tan and their inverses), logarithms (log base 10 and natural log), powers (x², x³, xⁿ), roots (square root, cube root), factorial, absolute value, reciprocal, percentage, memory functions, and mathematical constants (π, e, φ) — all running instantly in your browser with full keyboard support. Whether you need a quick non-graphing scientific calculator for a homework problem, an engineering calculation, or a statistics exercise, this tool handles it without installing an app or buying a physical calculator.
Casio fx-300 Scientific Calculator — Free Online Alternative
The Casio fx-300 series (fx-300ES Plus, fx-300MS) is one of the most widely used scientific calculators in US schools — approved for SAT, ACT, AP exams, and PSAT. It covers trigonometry, logarithms, powers, roots, factorial, and fraction calculations. This free online scientific calculator covers the same core function set, with the addition of calculation history (the fx-300 has none), a memory display showing your stored value at all times, and full keyboard input — making it faster to use on a desktop or laptop for homework, online exams, and coursework than hunting for a physical calculator.
Texas Instruments TI-30XIIS Scientific Calculator — Online Version
The Texas Instruments TI-30XIIS is the standard scientific calculator required or recommended in most US middle schools, high schools, and colleges. It is approved for the SAT, ACT, AP, and PSAT, and covers two-line display, trigonometry, logarithms, powers, roots, fractions, and statistical functions. This online scientific calculator replicates all of these core functions with a clean, modern interface, adding features the TI-30XIIS lacks — full calculation history showing your last 10 calculations, a persistent memory display, and keyboard input for faster use on computers during online coursework and homework.
Trigonometry Calculator — sin, cos, tan in Degrees and Radians
The trigonometric functions in this calculator work in both degree mode (the default for everyday geometry — angles from 0 to 360°) and radian mode (used in calculus, physics, and engineering — angles from 0 to 2π). Toggle between modes using the DEG/RAD button. The INV button switches to inverse trig functions (arcsin, arccos, arctan) for finding angles when you know the ratio. For example: sin(30°) = 0.5, arcsin(0.5) = 30°, sin(π/6) in radian mode = 0.5.
Logarithm Calculator — log and ln
This calculator includes both log base 10 (common logarithm, written log) and natural logarithm (ln, base e). log is used in chemistry (pH calculations), acoustics (decibels), earthquake magnitude (Richter scale), and finance (compound interest). ln is used in calculus, differential equations, physics (radioactive decay), and economics (continuous compounding). To calculate log(100), press log, enter 100, close the bracket, and press equals — result is 2. To calculate ln(e), press ln, enter e, and equals — result is 1.
Memory Functions — M+, M-, MR, MC
Memory functions are essential for multi-step calculations. M+ adds the current display value to the memory register. M- subtracts it. MR recalls the stored value to the display. MC clears the memory. For example, to calculate (15 × 4) + (12 × 7): calculate 15 × 4 = 60, press M+. Calculate 12 × 7 = 84, press M+. Press MR to see 144. The current memory value is always shown at the top of the calculator for reference.
What Makes This Scientific Calculator Different?
Most free online scientific calculators are basic four-function calculators with a few extra buttons. This tool adds features that paid and physical calculators lack online: a full calculation history showing the last 10 calculations with their expressions and results (click any to restore), a persistent memory display, an INV button for inverse trigonometric functions, φ (golden ratio) as a constant alongside π and e, |x| for absolute value, 1/x for reciprocal, EXP for scientific notation input, and full keyboard support for fast desktop use. All calculations run in the browser — no account, no install, no ads.
Frequently Asked Questions
How do I use the online scientific calculator for trigonometry?
Select DEG or RAD mode, click sin/cos/tan, enter your value, close the bracket, and press equals. Press INV first for inverse functions (arcsin, arccos, arctan). Example: sin(30) in DEG mode = 0.5.
Is this similar to Casio fx-300 or Texas Instruments TI-30XIIS?
Yes — it covers the same core functions. It adds calculation history, persistent memory display, and keyboard input that physical calculators lack. A free browser alternative for homework and online coursework.
How do I calculate powers and exponents?
Use x² for squaring, x³ for cubing, or xⁿ to raise to any power. Example: 2 → xⁿ → 8 → = gives 256. You can also type ^ on your keyboard.
What are memory functions and how do I use them?
M+ adds to memory, M- subtracts, MR recalls, MC clears. Useful for multi-step calculations where you need to hold a subtotal. The current memory value is always shown at the top.
Does this calculator support keyboard input?
Yes. Type numbers, +−×÷, parentheses, decimal point, and press Enter to calculate. Backspace deletes the last character. Escape clears. Much faster than clicking buttons on a desktop.
How do I calculate factorial on this calculator?
Enter a whole number and press n! to calculate its factorial. Example: 5! = 120. Supports up to 170! before hitting JavaScript's floating-point limits.
About This Tool — What Makes It Different
This Scientific Calculator was built by the FreeImageTools team — students, engineers, and developers who use mathematical calculators daily. The original 5-function tool was rebuilt from scratch into a full 25-function scientific calculator covering the complete function sets of the Casio fx-300 and Texas Instruments TI-30XIIS, with additions: INV mode for arcsin/arccos/arctan, φ (golden ratio) constant, absolute value, reciprocal, EXP notation input, calculation history (last 10 with expression and result, click to restore), persistent memory display, and full keyboard support. All calculations run in the browser using JavaScript's Math library — no server calls, no data stored. Reviewed and tested across all functions in June 2026.