Scientific Calculator

How to use

1. Type or Tap — Type an expression or use the keypad — supports parentheses, functions, and constants.
2. Choose DEG / RAD — Toggle degrees or radians for trig functions.
3. Get the Answer — Press = to evaluate. History saves your last 20 results for re-use.

The Scientific Calculator handles algebra, trigonometry, logarithms, exponents, and constants — entirely inside your browser. No download, no ads in the result area, and no risky eval().

Features

• Custom safe expression parser (no eval / Function).
• DEG / RAD toggle for trigonometric inputs.
• Constants π and e plus full function library.
• Calculation history — last 20 results re-usable with one click.
• Keyboard input or visual keypad — your choice.

Common uses

• Students — homework, exam prep, lab reports.
• Engineers — quick on-screen sanity checks.
• Finance teams — percentage and power calculations.

Privacy

Expressions are evaluated client-side. Nothing is logged, transmitted, or persisted beyond your tab's local history.

Frequently asked questions

What operators and functions are supported?

Arithmetic (+ − × ÷ %), exponent (^), parentheses, sin, cos, tan and their inverses, log (base 10), ln, sqrt, abs, exp, floor, ceil, round, plus constants π and e.

Is my data safe?

Yes — every calculation runs locally in your browser. No network requests, no analytics on expressions, nothing leaves your device.

Why not just use eval()?

eval() is a security risk and allows arbitrary code execution. We use a custom tokenizer + shunting-yard parser, so only mathematical expressions evaluate — anything else throws an error.

Can I use scientific notation?

Yes — 1.5e3, 2.4e-7 and similar are recognised as a single number.

Related free tools

• Tip Calculator — Calculate tip amounts and split bills among any number of people.
• Unit Converter — Convert length, weight, temperature, volume, area, speed, and data units.
• Hex to Decimal Converter — Convert between hexadecimal, decimal, binary, and octal.
• Binary to Decimal Converter — Convert binary numbers to decimal, hex, and octal instantly.
• Date Difference Calculator — Calculate days, weeks, months, and years between any two dates.
• Aspect Ratio Calculator — Calculate and scale aspect ratios with common presets.
• Number to Words — Convert numbers to their English word representation.
• Roman Numeral Converter — Convert between Roman numerals and decimal numbers.
• GPA Calculator — Calculate cumulative GPA on the 4.0 scale. Add courses, credits, and grades with real-time updates.
• Sales Tax & VAT Calculator — Add or remove sales tax, VAT, GST, or HST from any amount. Works for US, UK, EU, AU, IN, CA.
• Invoice Maker — Free professional invoice generator — multi-currency, VAT/GST, discount, instant PDF download. No sign-up, no watermark.
• Day of the Week Finder — Find what weekday any date falls on, plus ISO week, day of year, and leap-year status.