The calculator you reach for first
A scientific calculator is the workhorse of school and college maths: the four basic operations, plus the functions that turn arithmetic into real problem-solving — trigonometry, logarithms, powers, roots and constants. This one keeps all of that one tap away, with a history panel so you never lose an earlier result.
Degrees, radians, and the mistake everyone makes
The single most common source of a wrong trig answer is the angle mode. In degrees, sin 30 = 0.5. In radians, that same 0.5 comes from sin(π/6). Feed degrees into a calculator set to radians and the number will be quietly, confidently wrong.
The toggle at the top switches every trig function between the two at once, so set it before you start and the rest takes care of itself. Everything runs in your browser, free, with the history panel keeping your recent results within reach.
Frequently asked questions
What can a scientific calculator do that a basic one cannot?
Beyond the four basic operations it adds trigonometry (sin, cos, tan and their inverses), logarithms and exponentials, powers and roots, factorials, constants like π and e, and usually memory keys. It is the standard tool for school and college maths, physics and engineering.
Does it work in degrees or radians?
Both. There is a toggle that switches the angle mode for every trig function at once. In degrees, sin 30 is 0.5; in radians, sin of π/6 is the same 0.5. Getting this setting wrong is the most common cause of a trig answer that looks off.
How do the memory keys work?
M+ adds the current value to memory, M− subtracts it, MR recalls what is stored and MC clears it. It lets you set a number aside and build up a running total without writing it down — handy when a calculation has several parts.
Can I type with my keyboard?
Yes. Digits, the operators + − × ÷, parentheses and Enter all work from the keyboard, and the on-screen keypad mirrors them. The history panel keeps your recent results so you can reuse one without retyping it.
Is it free and private?
Completely. It runs entirely in your browser with no sign-up, no install and no ads inside the tool. Nothing you calculate is sent anywhere or stored between visits.