Calculator
0
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CE
C
√
x²
x^y
sin
cos
tan
÷
log
ln
1/x
×
7
8
9
−
4
5
6
+
1
2
3
=
0
.
π
e
%
+/−
Calculation History
- No calculations yet.
How to Use This Scientific Calculator
Tap the number and operator buttons to build an expression, then press = to evaluate it. The screen shows your full expression in grey above the live result.
Why Degrees vs Radians matters
Angles can be measured in two common units, and the same number means something completely different in each: sin(30) in degrees equals 0.5, but sin(30) in radians equals about -0.988, since 30 radians is many full rotations past 30 degrees. Always set the Degrees/Radians switch before evaluating a trig function.
Button reference
- C / CE — "C" clears the entire expression. "CE" (Clear Entry) removes only the last number or operator you entered.
- ⌫ (Backspace) — deletes the last digit you typed.
- sin / cos / tan — trigonometric functions. Use the Degrees/Radians switch at the top to choose the angle unit before evaluating.
- log is base-10 logarithm, ln is natural logarithm (base e).
- √ is square root, x² squares the current entry, x^y lets you type a custom exponent (e.g. 2 x^y 5 = 32).
- 1/x gives the reciprocal, +/− toggles the sign of the whole expression, and % divides the current entry by 100.
- π and e insert the mathematical constants pi (≈3.14159) and Euler's number (≈2.71828).
Worked example: sin(30°), step by step
- Make sure the Degrees/Radians switch reads "Degrees".
- Press the sin button to start the function.
- Press 3, then 0, then the closing parenthesis.
- Press = to see the result, 0.5.
Your last five calculations are kept in the history panel so you can refer back to them.
Frequently Asked Questions
Angles can be measured in two common units, and the same numeric input means something completely different in each: sin(30) in degrees equals 0.5, but sin(30) in radians equals about -0.988, since 30 radians is many full rotations past 30 degrees. Setting the correct mode before evaluating ensures the trigonometric functions interpret your angle input the way you intend.
log is the base-10 logarithm — it answers "10 to what power gives this number?" ln is the natural logarithm, base e (≈2.71828) — it answers "e to what power gives this number?" Base-10 log is common in engineering and everyday scientific notation, while natural log appears frequently in calculus, compound growth, and natural sciences.
"CE" (Clear Entry) is designed for fixing a typing mistake without losing the rest of a long expression you've already built — it removes only the most recent number or operator. "C" (Clear) resets the whole calculation, useful when you want to start a completely new problem rather than correct the current one.
x² is a shortcut that squares the current entry (raises it to the fixed power of 2) with a single button press. x^y is the general exponent function, letting you raise the current entry to any power you type — for example, 2 x^y 5 = calculates 2 raised to the 5th power, giving 32.
A percentage is mathematically a number divided by 100 — 25% is just another way of writing 0.25. Rather than displaying a percent symbol that would need separate interpretation, this calculator directly converts the current entry into its decimal equivalent, so it can be used immediately in further calculations like any other number.
π (pi, ≈3.14159) is the ratio of a circle's circumference to its diameter, used in geometry and trigonometry problems involving circles or angles. e (Euler's number, ≈2.71828) is the base of natural logarithms and appears in problems involving continuous growth or decay, like compound interest or radioactive decay. Both are irrational constants inserted at full calculator precision when you press their button.