About Scientific Calculator in Degree Mode
This scientific calculator opens in DEG mode, the setting used in most school trigonometry. Type sin(30) and you get 0.5, not a long decimal, because the common angles are computed exactly rather than through radians. It is free, needs no sign-up and runs in your browser, so nothing you enter is uploaded.
Degree mode matters because the same keys give different answers in radians: sin(30) is 0.5 in degrees but −0.988 in radians. If your answer looks wrong, the display unit is the first thing to check.
Inverse functions return degrees here: asin(0.5) is 30 and atan(1) is 45. You can switch to RAD or GRAD at any time without retyping.
How to use Scientific Calculator in Degree Mode
- Choose the angle unit first: DEG for degrees, RAD for radians or GRAD for gradians.
- Type the expression with the keyboard, or tap the keys. On a phone the scientific keys sit behind the "Show scientific keys" button.
- Read the live answer under the expression. Press Enter or = to keep it in the history and store it as Ans.
- Press 2nd for inverse functions, then a function key such as sin to get sin⁻¹.
- Use nCr(10,3), nPr(5,2) and root(27,3) with a comma between the numbers, or write 10 nCr 3.
- Tap a history entry to load its expression again, or Use to paste its result into the line you are writing.
Features
- Degrees, radians and gradians, with exact results at the common angles: sin(30°) is 0.5 and sin(180°) is 0, not 1.2e-16.
- Sin, cos, tan, their inverses, sinh, cosh, tanh and their inverses.
- Natural log, base-10 log and log with any base, written log(8,2).
- Squares, cubes, any power, square root, cube root and nth root, factorial, reciprocal and absolute value.
- Combinations nCr and permutations nPr, as functions or in the infix form 10 nCr 3.
- Percent, modulo, E notation (1.5E3), constants π and e, and Ans for the previous answer.
- Memory keys MC, MR, M+, M− and MS.
- A live typeset preview of the input, and a result display in large tabular figures.
- Optional fraction form of the result: 0.625 shown as 5/8 as well.
- History with click-to-reuse, a clear button and a copy button for the result.
Worked examples
sin(30) gives 0.5
Exact at 30 degrees.
sin(30)+cos(60)+tan(45) gives 2
0.5 + 0.5 + 1.
asin(0.5) gives 30
The angle whose sine is 0.5.
tan(90) gives no value
Tangent is undefined at 90 degrees, so the calculator reports it.
Privacy: how it works
- Every calculation runs in your browser tab. The history is saved in this browser only (local storage) and is never sent to Ulkaa or anyone else. Clear it with one button, or clear your browser data.
Tips
- log means base 10 and ln means natural log. Use log(x,b) for any other base.
- Percent turns the number before it into a hundredth, so 200×10% is 20. Write mod for a remainder: 10 mod 3 is 1.
- Factorial works for whole numbers up to 170 and gives an error beyond, because the result no longer fits in a number.
- If the keypad is in the way on a phone, tap the keyboard button beside the expression to type with the device keyboard.
- tan(90°) has no value, and the calculator says so instead of showing a huge number.
Frequently asked questions
Is it really free?
Yes. There is no price, no trial and no credit card. Ulkaa Tool does the work with your own device, so there is no server bill to pass on to you.
Do I need an account?
No. There is no sign-up and no login. Open the page and use it. An Ulkaa account is not needed for anything on this tool.
Does it run in my browser?
Yes. Your calculations are processed by code running in your browser tab, on your own device.
Is my data uploaded?
No. Your calculations are never sent to Ulkaa or to anyone else. You can check this yourself by watching the Network tab in your browser developer tools while you use the tool.
How do I put the calculator in degree mode?
This page opens in DEG. If you changed it, tap DEG above the display.
Why is sin(180) exactly 0 here?
Many calculators compute it through radians and show a number like 1.2e-16. This one reduces the angle first, so the common angles come out exact.
More Scientific Calculator pages
- Scientific CalculatorA full scientific keypad with degrees, radians and gradians, memory, history and a live formula preview.
- Scientific Calculator in Radian ModeTrigonometry in radians, with π as a key and inverse functions that return radians.
- Scientific Calculator in Gradian ModeTrigonometry in gradians, also called gons or grades, where a full turn is 400.
- Scientific Calculator With Fraction ResultsType a calculation and see the answer as a decimal and, when it has a simple form, as a fraction.
- Factorial CalculatorPress x! after a number to multiply it by every whole number below it.
- Combinations and Permutations CalculatorType nCr(n,r) to count unordered choices and nPr(n,r) to count ordered arrangements.
- Exponent and Root CalculatorUse xʸ for powers and √, ∛ and ⁿ√ for roots, in one expression.
- Logarithm CalculatorCalculate log base 10, natural log ln and logarithms to any base.