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Scientific Tools · Updated October 21, 2026 · Reviewed by FormatFlow Editorial

Scientific Calculator

You can evaluate scientific expressions in your browser with a safe parser: arithmetic, powers, parentheses, factorial, constants and trig or log functions, with degree or radian mode and a history list.

Runs in your browserFree · No sign-up · No watermark
EXPRESSION → RESULTRuns in your browser
Loading the tool…

Everything runs locally in this tab. No file is uploaded while the tool loads.

This tool runs in your tab. Nothing is uploaded and no copy is stored.

How files are handled

At a glance

Works with
EXPRESSION → RESULT
Processing
In your browser
Price
Free, no account
Updated
October 21, 2026
All Scientific Tools

About Scientific Calculator

A scientific calculator is only useful if you trust what it did with the expression. Typing sin 30 with the wrong angle mode or misplacing a parenthesis gives a confident wrong answer, and an interface that hides the parsed expression makes the mistake hard to spot.

This calculator parses the expression you type with a small recursive-descent parser rather than eval, then shows the canonical form it evaluated next to the result. Powers, factorial, constants π and e, trig, inverse trig, logarithms, square roots and exponentials are supported, with DEG/RAD mode, keypad and keyboard entry, and a short history list.

What this tool does

The details that matter when you use Scientific Calculator for real work.

  • Safe expression parser

    Expressions are tokenized and evaluated with a recursive-descent parser; no eval or Function constructor runs, so the page stays isolated.

  • Scientific functions

    Powers, factorial, π and e, sin, cos, tan, inverse trig, log10, ln, sqrt, abs and exp are available from the keypad.

  • DEG/RAD mode

    Trig arguments and inverse trig results switch between degrees and radians, and the active mode is shown beside the input.

  • Parsed form shown

    The canonical expression, with implicit multiplication made explicit, sits under the result so you can check what was evaluated.

  • History and keyboard

    Press Enter or = to keep the calculation, click an entry to reuse it, and type with the keyboard or the on-screen keypad.

How to use Scientific Calculator

No account, no installation — the whole job happens in this browser tab.
  1. 01

    Type or tap the expression

    Use the keyboard or the keypad; function keys insert their opening parenthesis automatically.

  2. 02

    Set the angle mode

    Choose DEG or RAD before using sin, cos, tan or their inverses.

  3. 03

    Read the interpreted expression

    Check the canonical form under the result to confirm operator order and implicit multiplication.

  4. 04

    Keep useful calculations

    Press Enter or = to add the calculation to history; click any entry to load it back into the input.

  5. 05

    Reuse a result

    Load a previous calculation from the history and edit the expression instead of retyping it from scratch.

How this tool works

Works with
EXPRESSION → RESULT
Processing
Client-side, in your browser. Nothing is uploaded.
Requirements
Chrome, Edge, Firefox or Safari · JavaScript enabled

Limitations worth knowing

  • No variable storage or graphing; it evaluates single expressions and keeps a short display history.
  • Scientific notation is not accepted as input (write a × 10^n instead), and results are rounded to 12 significant digits for display.
  • Factorial is limited to whole numbers from 0 to 170.

Privacy and file handling

Expressions are parsed and evaluated with plain JavaScript inside your browser tab. Nothing is uploaded, logged or stored, and the history is kept only in memory for the current page. Closing or reloading the page clears it.

Read the full privacy policy

Scientific Calculator FAQ

Short, direct answers to the questions people ask before using this tool.
Is the calculator really safe from eval injection?
Yes. The expression is tokenized and parsed by a small recursive-descent parser inside the page; no eval, Function constructor or DOM script is used, so the typed text cannot execute arbitrary code.
How are degrees and radians handled?
In DEG mode, arguments to sin, cos and tan are converted from degrees to radians, and asin, acos and atan return degrees. In RAD mode the standard radian values are used. The active mode is shown beside the input.
Why is 1e3 rejected in an expression?
Plain scientific notation would make the letter e ambiguous with Euler's number, so the parser rejects it and explains the alternative: write 1.2 × 10^3 instead.
What is the precedence of the operators?
Powers are evaluated before multiplication and division, which come before addition and subtraction; powers are right-associative and unary minus applies after the exponent. The interpreted form under the result shows the result of that parsing.
What does factorial accept?
Factorial needs a whole number between 0 and 170. Non-integers, negatives and larger values produce a clear error rather than an approximation.
Why does the result show fewer digits than I typed?
Results are rounded for display to 12 significant digits, which hides floating-point noise such as 0.30000000000000004 while keeping ordinary precision. The calculation itself runs at full double precision.
Can I use it without a keyboard?
Yes. Every function and digit is available on the on-screen keypad, which also works with keyboard focus and screen readers. The text field is there when typing is faster.
Are my calculations sent anywhere?
No. Parsing and evaluation happen in your browser; the expression and history stay in the tab and vanish when you close or reload the page.

Background reading

Format guides that explain the trade-offs behind Scientific Calculator.