A Free Scientific Calculator in Your Browser: Trig, Logs, Powers and More
Board exam practice at 11 pm, and the calculator is in a school bag at a friend's house. Or you're at work, need a quick log or a compound growth figure, and the phone's calculator only does the basics in portrait mode. Scientific calculator does the scientific functions in a browser tab, with a typed expression line and history you can reuse.
Steps
- Type an expression such as
2sin(30) + √16, or use the on-screen keys. - Choose DEG or RAD for trigonometry.
- Press = (or Enter on a keyboard). Tap a line in the history to reuse it.
The answer previews as you type, so you see mistakes before you press equals.
What it covers
- Trigonometric functions and their inverses, plus hyperbolic functions.
- Natural log and base-10 log.
- Powers and roots.
- Factorials, permutations and combinations.
- Percentages, π, e, a random number.
- Ans for the previous result, and memory for storing values.
Results show up to 12 significant digits, switching to scientific notation for very large or very small numbers.
Order of operations, and the -2² surprise
The calculator follows the standard order: brackets, powers, then multiplication and division, then addition and subtraction. It also understands implied multiplication, so 2π and 3(4 + 5) work.
The classic surprise: -2^2 gives -4, not 4. Powers are evaluated before the minus sign, as on most scientific calculators and in maths notation. If you mean "negative two, squared", write (-2)^2.
Another one: 1/2π. Is that 1/(2π) or (1/2)π? Implied multiplication varies between calculators. When in doubt, add brackets. Exam markers never penalise extra brackets.
Degrees vs radians
Half of all "the calculator's wrong" moments are a calculator in the wrong angle mode. sin(30) is 0.5 in degrees and about −0.988 in radians. The current mode is shown on the display and applies to sin, cos, tan and their inverses. School geometry problems use degrees; calculus and physics often use radians.
Example: a compound interest check
₹50,000 at 7.5% a year for 10 years: type 50000 × (1 + 0.075)^10 and get about ₹1,03,052. Need monthly compounding? 50000 × (1 + 0.075/12)^120. History keeps both lines so you can compare.
Example: combinations
How many ways to choose a team of 4 from 11 players? Use the combinations function: 11C4 = 330. If order matters (captain, vice-captain, etc.), permutations: 11P4 = 7,920.
Tips
- Type with the keyboard on a computer: numbers, operators, brackets and function names all work, and it's faster than clicking.
- Use Ans to chain steps instead of retyping long decimals.
- Check exam rules. Many exams ban phone or computer calculators, so practise on the model you'll be allowed to use as well.
- For plotting functions, use Graphing calculator.
Checking your working
The preview line is quietly the most useful feature for students. Type a long expression and watch the preview as you close each bracket: if the number jumps somewhere unexpected, a bracket is in the wrong place. It's much easier to spot a mistake mid-expression than to work out afterwards why the final answer doesn't match the textbook.
Privacy
According to the page, calculations and history are kept in this browser. Google ads run on the page, as across the site.
FAQ
How do I switch between degrees and radians? Press DEG or RAD; the mode shows on the display.
Can I type with the keyboard? Yes, then press Enter.
What does Ans do? It holds the last result, so you can continue from it.
Why is -2^2 equal to -4? Powers come before the minus sign. Use (-2)^2 for 4.
Keep Scientific calculator bookmarked for the next homework or work calculation.
— Alok Kumar Singh