Scientific Calculator
Type a calculation or tap the keys: powers, roots, logarithms, factorials, percent and trigonometry in degrees or radians, with your last answer kept as Ans. What you type stays in your browser.
Ans: no answer yet
Enter or = works it out, Esc clears. Numbers are double-precision floating point; answers are shown to 12 significant digits.
This visit’s answers
Nothing yet. Your last 10 answers appear here until you leave the page. Select a calculation to use it again.
A scientific calculator that tells you what went wrong
Homework, a recipe scaled by an awkward factor, or the angle of a garden ramp: some sums need powers, roots or trigonometry. Type the calculation the way you would write it, or tap the keys, and the answer appears as you go. If something doesn’t add up, such as a missing bracket, the calculator says what to fix.
How to use it
- Type a calculation, such as 2+3×4, or tap the keys. On a keyboard, * or x works for ×, and / for ÷.
- Choose degrees or radians before using sin, cos or tan.
- Press = or Enter. The answer becomes Ans and joins the history.
- Press an operator straight after an answer to carry on from it: + after 36 starts Ans+.
How it reads a calculation
- Order: brackets, then powers, then × and ÷, then + and −, as in written math. So −3² is −9; type (−3)² for 9. Powers work right to left: 2^3^2 is 2^9.
- Side by side means times: 2π, 3(4+1) and 2√9 are multiplications at the same level as × and ÷, so 1/2π is (1/2)×π. Type 1/(2π) if you mean that.
- Percent: 10% is 0.1, but after + or − it’s a percent of the number before, so 200+10% is 220.
- Functions need brackets: sin(30), ln(5), and root(8, 3) for the cube root of 8. √ and ∛ work without them: √16.
- Large and small numbers: 2.5E3 is 2,500 (EXP types the E). Factorials work on whole numbers up to 170.
How precise it is
Numbers are stored as double-precision floating point, the usual computer format for decimals, which holds about 15 to 17 significant digits. Answers are rounded to 12 significant digits for display, which hides the tiny binary leftovers in most results, while Ans keeps the full value. An angle that lands on a multiple of 90° (or π/2) gives an exact 0, 1 or −1, so sin(180) is 0.
Good to know
- Keyboard: Enter or = works it out, Esc clears and Backspace deletes, even while a key has focus.
- Clear errors: an open bracket, dividing by zero or √ of a negative number gets a message, not a wrong answer.
- Not saved: the history keeps your last 10 answers until you leave the page.
- Counting words instead? Try the Word and Character Counter.