Online calculator

Unlike a button calculator, here you type the whole expression exactly as you would write it on paper. That removes the most common mistake: losing track halfway through a long calculation.

The expression is parsed following operator precedence, so 2 + 3 * 4 returns 14, not 20.

Your text is turned into an operation tree before anything is computed. Brackets are resolved first, then powers, then multiplication and division, and finally addition and subtraction.

You can use constants (pi, e) and functions by typing their name followed by brackets: sqrt(16), abs(-5), round(2.7).

Everything is calculated in your browser

Nothing is sent to any server. The numbers you type never leave your machine, so you can use it with data you would rather not share. It is also why it works instantly and offline once the page has loaded.

Order of operations is not negotiable

Brackets first, then powers, then multiplication and division left to right, and finally addition and subtraction. Typing 2 plus 3 times 4 gives fourteen, not twenty. When in doubt, brackets are free and settle arguments: the viral puzzle that divides the internet every few months is resolved by adding them.

The minus in front of a power

Minus two squared gives minus four if read as the negative of two squared, and four if the sign is taken as part of the base. The mathematical convention is the first. To express the second you must write the brackets explicitly.

Decimals are not exact in binary

Zero point one plus zero point two does not give exactly zero point three in any system using floating point, spreadsheets included. The differences appear around the fifteenth decimal place and only matter in chained high precision calculations.