Scientific Calculator

Your trusty scientific sidekick — trig, logs, powers and roots, all in one tidy keypad.

DEG RAD

What this calculator is for

A standard phone calculator handles a tip or a grocery total, but it stops short the moment you need a sine, a natural log, or a cube root. This scientific calculator fills that gap. It covers trigonometry (sin, cos, tan and their inverses), logarithms (log base 10 and natural log), exponents and powers, square and higher roots, factorials, and the constants π and e. It's the everyday tool for algebra, geometry, trig, physics, chemistry, and engineering coursework.

Degrees vs. radians — the setting that trips people up

The single most common wrong answer on a scientific calculator comes from the angle mode. In degrees, sin(30) = 0.5. In radians, sin(30) is about −0.988, because 30 radians is a completely different angle. Trig homework and most geometry problems use degrees; calculus and physics almost always use radians. Check the DEG / RAD toggle before you trust a trig result — if your answer looks wildly off, this is the first thing to fix.

A quick worked example

Say you want the hypotenuse of a right triangle with legs 3 and 4. Enter 3, tap x², add 4 x², then take the square root of the total: √(9 + 16) = √25 = 5. For exponents like 2 to the 10th power, use the x^y key: 2, x^y, 10 gives 1024. Logs work the same way — log(1000) returns 3 because 10³ = 1000.

How to use it

Set the angle mode with the DEG / RAD toggle before doing any trig — degrees for most homework, radians for calculus.
Type your numbers and tap function keys like sin, log, or x^y; use parentheses to group parts of a longer expression.
Press = to evaluate. The result stays on screen so you can keep operating on it.
Use the clear key to reset, or delete to fix a single mistaken keystroke without starting over.

FAQ

Why is my sine or cosine answer wrong?: Almost always the angle mode. A value expected between −1 and 1 that looks strange usually means you're in radians when you wanted degrees, or the reverse. Flip the DEG / RAD toggle and recompute.
What's the difference between log and ln?: log is base 10 (log 100 = 2) and ln is the natural log, base e ≈ 2.718. Chemistry pH uses log; growth, decay, and calculus use ln.
Can I use it on my phone during class?: Yes. It runs entirely in your browser with no app to install and no upload, so it works on a phone, tablet, or laptop as long as the page is loaded.
Is it free?: Completely free and supported by the ads on the page — there's no sign-up and no usage limit.