If you learned math on a two-line calculator with a SHIFT key, your thumbs still remember the layout. This is that calculator, in your browser.
Free math tool
Scientific Calculator
The classic two-line school calculator, in your browser: trig, logs, powers, roots, factorials, memory, and full keyboard support. Switch to Advanced for fractions, S⇔D, nPr/nCr and hyperbolic functions.
Runs entirely in your browser. Click the calculator once, then your keyboard works too: digits, + − * / ^ ( ), Enter for =, Backspace for DEL, Escape for AC.
Reading the two-line display
The top line shows the expression exactly as you typed it, the bottom line shows the answer, the layout a whole generation learned math on. The point of it is checkability: when an answer looks wrong, the expression is still right there, and nine times out of ten the culprit is visible immediately, a missing parenthesis, or trig running in the wrong angle mode. The small DEG or RAD indicator above the display tells you which mode you are in before you press a trig key, not after the answer surprises you.
Scientific calculator FAQ
Why do sin, cos and tan give me the "wrong" answer?
Almost always because of the angle mode. In DEG mode, sin(30) is 0.5, the school answer. In RAD mode the same keys expect radians, so sin(30) means 30 radians and gives -0.988. The current mode is shown above the display; tap DEG/RAD to switch. This exact mix-up is the most common "broken calculator" report there is.
What does the SHIFT key do?
The same thing it does on a physical scientific calculator: it switches keys to their secondary function, printed above the key. SHIFT then sin gives you inverse sine (sin⁻¹), SHIFT then ln gives e to the power x, and so on. Press SHIFT again to leave shift mode without using it.
What is the Ans key?
Ans holds the result of your previous calculation, so you can chain work without retyping: after 12×4 gives 48, pressing ÷ 6 = automatically continues from Ans. Starting a new expression with an operator does the same thing, exactly like the classroom calculators this layout is based on.
Does this calculator follow the correct order of operations?
Yes. It parses the whole expression before evaluating, so 2 + 3 × 4 is 14, not 20, powers bind tighter than multiplication and are evaluated right-to-left (2^3^2 is 512), and parentheses override everything. You can also leave trailing parentheses unclosed and = will close them for you, like the classics did.
Can I type with my keyboard?
Yes. Digits, + - * / ^ ( ) and the decimal point insert directly, Enter evaluates, Backspace deletes, and Escape clears. On a phone, the on-screen keys work like the real thing, including a proper DEL.
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Why the two-line display beat everything that came before it
Older calculators showed you only the number you just typed, so a long calculation lived in your head and one slip meant starting over. The two-line design changed that: the expression stays visible on top while the answer appears below, which means you can actually check what you asked before trusting what you got. It is the same reason this version keeps your expression on screen after pressing equals, and lets DEL reopen it for editing instead of throwing it away.
The DEG/RAD trap that ruins more homework than anything else
Type sin(30) and get -0.988 instead of 0.5, and nothing is broken: the calculator is in radians while you are thinking in degrees. Every scientific calculator ever made has this trap, and every generation of students falls into it during one exam. The mode indicator sits directly above the display here, and one press of the DEG/RAD key switches it. Checking that indicator before any trig is the single habit that separates people who trust their calculator from people who fight it.
What the order of operations actually does with your keystrokes
This calculator reads the whole expression before computing anything, the way the classroom models do. So 2 + 3 × 4 is 14 because multiplication binds before addition, 2^3^2 is 512 because stacked powers evaluate from the top down, and -2² is -4 because the square applies before the sign, a convention that surprises people but matches both the classic calculators and standard mathematical notation. When in doubt, parentheses always win, and if you leave one unclosed, equals closes it for you.
Ans is the key that makes long work bearable
Every result is remembered. Press an operator right after equals and the calculation continues from the previous answer; press Ans anywhere in an expression to reuse it explicitly. Chained work, unit conversions in steps, iterating a formula, checking a result from both directions, stops requiring you to retype numbers you just computed, which is where most transcription errors are born.