Loona Calculators
A full scientific calculator in your browser: trig functions and their inverses, logarithms, powers and roots, factorial and percent — with DEG/RAD angle modes and complete keyboard support.
DEG measures angles in degrees (a full turn is 360°) and RAD measures them in radians (a full turn is 2π). School and everyday maths usually use degrees; advanced maths and science often use radians. Always check the mode before using sin, cos or tan — sin(30) is 0.5 in DEG mode but about −0.988 in RAD mode.
Tap 5, then the xʸ button, then 3, then =. You can also type 5^3 with your keyboard. The x² button is a shortcut that squares the number before it.
It divides the number before it by 100, so 50% becomes 0.5 and 8% becomes 0.08. For example, 200 × 8% = 16 — handy for quick tax, tip and discount sums. For percentage change between two numbers, use our Percentage Calculator.
This calculator reads your whole expression and works it out using the standard order of operations — the same rules taught in school:
1. Brackets first — anything inside ( ) is worked out before everything else.
2. Powers and roots — xʸ, x² and √ come next. Powers are right-associative: 2^3^2 means 2^(3^2) = 512.
3. Multiplication and division — × and ÷ are done left to right. You can also write multiplication by placing things side by side, like 2π or 2(3 + 4).
4. Addition and subtraction — + and − are done last, left to right.
Functions such as sin, log and ln apply to the value in their brackets. log is base 10 (log 1000 = 3) and ln is the natural logarithm, base e. The n! button gives the factorial — 5! = 5 × 4 × 3 × 2 × 1 = 120 — and works for whole numbers from 0 upwards.
Almost always the angle mode. If the calculator is in RAD mode it treats 30 as 30 radians, not 30 degrees. Tap the DEG/RAD button so it shows DEG, then try again. The mode is shown on the button at the top-left of the keypad.
Use a fractional power: the cube root of 27 is 27^(1/3) = 3. In general, the nth root of a number x is x^(1/n). The √ button covers the common square-root case.
Yes, it is completely free with no sign-up. Everything is calculated in your own browser — your expressions are never sent to or stored on a server.
Add this calculator to your own website or blog — it is completely free, needs no sign-up, and always shows the latest version. Copy the code below and paste it into your page where you want the calculator to appear. Keeping the small “Powered by Loona Automation” credit line under the embed helps keep this tool free — but you are free to style or remove it; the tool works either way.