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A free scientific calculator online for students, engineers, and everyday maths. Use this calculator for trigonometry, logarithms, powers, roots, and more — no sign-up required.
Enter a number using the digit pad, then press any scientific function — sin, log, √x, x², and so on — to apply it instantly to the displayed value. For binary operations like xʸ (power), enter the base, press xʸ, enter the exponent, then press =. Use the DEG/RAD button to toggle between degree and radian mode for all trigonometric functions; the active mode is always shown in the display.
Parentheses let you group sub-expressions: press (, enter your sub-expression, then press ) to close it before continuing. The EXP button enters scientific notation — type a number, press EXP, then type the exponent (e.g. 1.5 EXP 3 gives 1500). For memory, use M+ / M− to accumulate values and MR to recall the stored total; a small M badge in the display confirms when memory is non-zero.
Keyboard input is fully supported: type digits and operators directly, press Enter to evaluate, Backspace to delete, Escape to clear, and parentheses with ( / ). The expression history above the main display always shows the last completed calculation so you can follow your working.
A scientific calculator handles the extended maths needed in science, engineering, and advanced study — trigonometry, logarithms, exponents, roots, and more — beyond the four basic operations. It is a calculator for students taking physics, chemistry, or higher-level maths, as well as professionals who need precise results quickly.
DEG (degrees) and RAD (radians) are two units for measuring angles. A full circle is 360° in degrees and 2π ≈ 6.2832 in radians. Trigonometric functions (sin, cos, tan) give different results depending on which unit you use, so always check the mode matches your problem. Physics and engineering often work in radians; everyday geometry usually uses degrees.
First set the correct angle mode with the DEG/RAD button. Then type your angle value — for example, 45 — and press sin, cos, or tan. The result appears instantly. For inverse functions (to find the angle from a ratio), use sin⁻¹, cos⁻¹, or tan⁻¹ in the same way.
The e button inserts Euler's number (≈ 2.71828), the base of natural logarithms. It appears throughout calculus, statistics, and compound growth formulas. The related eˣ button computes e raised to the power of the current display value — useful for exponential growth and decay problems.
Press M+ to add the current value to memory, or M− to subtract it. Press MR at any time to recall the stored total into the display. Press MC to clear the memory back to zero. A small M indicator appears in the display whenever memory holds a non-zero value, so you always know when something is stored.
Yes, completely free. No account, no sign-up, and no usage limit. Use it as many times as you need in any browser, on any device, at no cost.