About the Scientific Calculator
Here is a full scientific calculator that opens in under a second and installs absolutely nothing. It covers sine, cosine and tangent with their inverse functions, natural and base-10 logarithms, square roots, powers, factorials, the constants π and e, percentages and nested parentheses. A DEG/RAD toggle switches between degrees for everyday geometry and schoolwork, and radians for calculus and physics.
Unlike a physical calculator, the whole expression stays visible in an editable field — type with your keyboard, tap the on-screen keys, or mix both, then fix a typo anywhere in the line before pressing equals. Results are cleaned of floating-point noise so answers read the way you expect. It is free, works on any device, and keeps running offline once loaded.
Features
- Trig and inverse trig in degrees or radians
- Natural log, log base 10, roots and powers
- Factorials, π, e, percent and parentheses
- Type expressions or tap the on-screen keypad
- Full expression stays visible and editable
- Free, no download, works offline once loaded
How to use the scientific calculator
- Choose DEG or RAD depending on your angle units.
- Build your expression with the keypad or type it directly.
- Use parentheses to group operations as needed.
- Press = to evaluate the whole expression.
- Press AC to clear, or the backspace key to edit.
Frequently asked questions
Should I use DEG or RAD mode?
Use DEG when angles are measured in degrees — everyday geometry, navigation and most school trigonometry, where sin(90) = 1. Use RAD for calculus, physics and engineering, where angles come in radians and sin(π ÷ 2) = 1. The toggle affects sin, cos, tan and their inverse functions.
Which functions does this calculator support?
It handles sin, cos, tan, asin, acos, atan, natural log (ln), base-10 log, square roots, powers via the ^ key, factorials with !, absolute value, percent, and the constants π and e — plus parentheses for grouping. That covers typical high-school, university and engineering coursework.
Does it follow the correct order of operations?
Yes. Expressions are evaluated with standard mathematical precedence: parentheses first, then functions and factorials, then exponents, then multiplication and division, then addition and subtraction. So 2 + 3 × 4 gives 14, and you can add parentheses whenever you want to force a different grouping.
Why do some calculators show a tiny number instead of zero?
Computers store numbers in binary floating point, so results like sin(180°) can come out as 0.0000000000000001 rather than exactly 0. This calculator rounds every displayed answer to ten decimal places, which removes that floating-point noise while still preserving more than enough genuine precision for coursework and engineering calculations.
Can I type instead of pressing the buttons?
Yes — the display is a real text field. Click into it and type digits, operators and function names directly, use your arrow keys to move around, and correct mistakes anywhere in the expression. Tapping the on-screen keys inserts at the end, and both input styles mix freely.