Scientific Calculator
A full online scientific calculator — trig, logarithms, powers, roots and factorial, with keyboard support and a Deg/Rad toggle, right in your browser.
Tip: you can type with your keyboard. Enter = evaluate, Esc = clear.
Quick answer
A scientific calculator handles far more than basic arithmetic: trigonometry (sin, cos, tan), logarithms (ln and log), powers and roots, parentheses and factorials. Type an expression with the buttons or your keyboard, press =, and the answer appears instantly. Everything runs in your browser, so it is free, private and works offline once loaded.
What a scientific calculator can do
Where a basic calculator stops at add, subtract, multiply and divide, an online scientific calculator adds the functions you need for algebra, trigonometry, statistics and science homework. This one covers the trigonometric functions sin, cos and tan, natural and base-10 logarithms (ln and log), square roots, any power through the xʸ key, factorials, the constants π and e, and full parentheses so you can build multi-step expressions and let the calculator respect the correct order of operations.
Order of operations and precedence
The calculator follows standard mathematical precedence, so you can type a whole expression in one go. Powers are evaluated before multiplication and division, which come before addition and subtraction, and anything inside parentheses is worked out first. Because the parser is right-associative for exponents, 2^3^2 is read as 2^(3^2) = 512, exactly as it would be on paper. If you ever mistype and the expression cannot be parsed, the display simply shows Error so you can correct it.
Degrees, radians and privacy
Use the Deg/Rad togglein the corner of the display to tell the trig functions whether your angles are in degrees or radians — a common source of wrong answers in homework. On a computer you can skip the buttons entirely and type with your keyboard: Enter evaluates and Escape clears. Every calculation is performed locally with JavaScript using a safe expression parser (no eval), so nothing you enter is uploaded or stored, and the tool keeps working even without an internet connection.
Frequently asked questions
Is this scientific calculator free to use?+
Yes. This online scientific calculator is completely free with no sign-up, no ads in the way and no limits. It runs entirely in your browser, so you can use it as often as you like on your phone, tablet or computer.
Does it work on a phone and with a keyboard?+
Both. The button grid is sized for touch on phones and tablets, and on a desktop you can type directly: digits, + − * / ^ ( ) ! and % all work, Enter evaluates the expression and Escape clears it.
What is the difference between Deg and Rad?+
The Deg/Rad toggle controls how the trigonometry functions read angles. In Deg mode sin, cos and tan treat your input as degrees (so sin(30) = 0.5); in Rad mode they treat it as radians (so sin(π/6) = 0.5). Tap the toggle in the top-left of the display to switch.
How do powers, roots and factorial work?+
Use xʸ (the ^ key) for any power, for example 2^10. The x² key squares the current value, √ takes a square root, and n! calculates the factorial of a non-negative whole number, such as 5! = 120. Percent (%) divides a value by 100, so 50% becomes 0.5.
Is my calculation private?+
Yes. Everything is computed on your own device with JavaScript — no expression is uploaded, stored or sent to a server. The calculator even keeps working offline once the page has loaded.