Scientific Calculator

What is scientific calculator?

A scientific calculator handles more than basic arithmetic. It understands brackets, powers, roots, logarithms, factorials and trigonometry, and it applies the order of operations so that multiplication and powers happen before addition.

This version reads a whole expression at once, which is faster than pressing keys one by one and lets you check your working before you press the button.

How to use the scientific calculator

1. Type your expression, for example 2*(3+4)^2.
2. Choose degrees or radians for sin, cos and tan.
3. Press Calculate and read the result.

How the scientific calculator works

The expression is read by a small parser that follows the standard order: brackets first, then factorial and powers, then multiplication, division and remainder, then addition and subtraction. Functions such as sin, cos, tan, sqrt, ln and log are evaluated on the value inside their brackets. Nothing is sent to a server and no code is executed from your input.

Worked example

Common uses of the scientific calculator

• Checking homework and exam practice.
• Engineering and physics estimates.
• Working out compound expressions in one line.
• Converting between angle based and ratio based results.
• Quick checks while coding or building a spreadsheet.

Tips and common mistakes

Use ^ for powers, so 2^10 is 1024.

In degrees mode sin(30) is 0.5. In radians mode the same input gives a different value, so check the mode first.

Write multiplication with a star. The tool does not guess that 2(3) means 2 times 3.

Background: what to know before you rely on it

Scientific calculators became common in the 1970s and replaced slide rules and printed tables of logarithms. The key idea they share is operator precedence, a rule set that decides which operation goes first so that everyone reads the same expression the same way. Trigonometric functions depend on the angle unit. A full circle is 360 degrees or 2 pi radians, and most mistakes with sin, cos and tan come from using the wrong mode. Floating point arithmetic stores numbers in binary, so a few results such as 0.1 plus 0.2 show tiny rounding differences, which this tool hides by rounding to 14 significant digits.

Private, free and fast

This tool runs entirely in your browser. What you type or choose is not uploaded to a server and is not saved after you close the page, which keeps it fast and private. It is free to use as often as you like. See more in all calculators, or browse the full list of tools.

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Results are for information and education. For legal, financial, medical or security decisions, check with a qualified professional. Financial results are estimates and exclude fees and taxes unless the tool says otherwise.