How does it work?
- Type your calculation the way it’s written: “sin” writes “sin(”, and forgotten brackets close by themselves when you press “=”.
- 2nd gives you the inverse functions for one key: sin⁻¹, cos⁻¹, tan⁻¹, eˣ, 10ˣ, 1/x, ˣ√y, e and |x|.
- DEG or RAD sets the angle unit, shown at the top of the display. Ans brings back the last answer.
Keyboard shortcuts
- Digits and operators: 0 to 9, +, -, * (multiply), / (divide), %.
- ^: power; ( and ): brackets; !: factorial. Functions are entered with the buttons.
- Decimal point: the period key, or the comma key.
- Enter or =: calculate.
- Backspace: delete the last digit; Esc: clear all.
- Ctrl + C or ⌘ + C: copy the result; Ctrl + V or ⌘ + V: paste a number or a calculation.
Frequently asked questions
Degrees or radians: which should I pick?
Degrees (DEG) for everyday geometry: a right angle is 90°. Radians (RAD) for calculus and physics: a full turn is 2π. Careful: sin 30 is 0.5 in degrees but −0.988 in radians, so check the label at the top of the display.
In what order are calculations done?
Brackets and functions first, then powers, from right to left (2^3^2 = 2^9 = 512), then × and ÷, and finally + and −. The minus sign comes after the power: −2² = −4, as in maths. An implied “×” is written out: 2π becomes “2 × π”.
How do I work out a power or an nth root?
xʸ raises to a power: 2 xʸ 10 = 1,024. For an nth root, type the index, then 2nd and ˣ√y, then the number: 3 ˣ√ 8 = 2, the cube root of 8. The square root has its own key, √.
What does the n! key do?
The factorial multiplies every whole number from 1 up to the number: 5! = 5 × 4 × 3 × 2 × 1 = 120. It counts the ways to arrange things: 10 bananas can be lined up in 3,628,800 ways. It goes from 0! to 69!; beyond that, the result exceeds 10¹⁰⁰.
Why does sin 180° give exactly 0 here?
π has no finite decimal form, so many calculators answer 1.2 × 10⁻¹⁶ instead of 0. Here, calculations run in decimal on 40 digits, and notable angles (multiples of 90°) give their exact value. And nothing is sent anywhere: it’s all worked out in your browser.
