Scientific Calculator
Trigonometry in degrees or radians, logs, powers, roots, factorials, permutations and combinations — with a live preview, memory, ANS and a history you can click to reuse.
A scientific calculator works out trigonometry, logarithms, powers, roots and factorials from a typed expression. Set DEG for school trigonometry: sin(30) = 0.5 in degrees but −0.988 in radians. Combinations use nCr = n! ÷ (r!(n − r)!), so 5C2 = 10 — the number of ways to choose 2 friends from 5.
Enter or = calculateEsc clear⌫ delete^ power! factorial
Tap a calculation to edit it again, or its answer to insert the value.
| Key | Meaning | Try |
|---|
A calculator that shows what it did
Type the whole expression the way it is written in your textbook. The answer previews as you type, and every calculation is kept in your history.
Pick DEG or RAD
School trigonometry uses degrees. Switch to radians for calculus and Class 11 graphs.
Type or tap
Use the keypad or your keyboard — sin(30), 5C2, 2^10, √(49), log(1000).
Press = or Enter
The answer appears in large type, with a fraction form when one exists.
Reuse answers
Use ANS for the last answer, M+ / MR for memory, or tap any history entry.
Degrees and radians
π radians = 180°
To convert, multiply degrees by π/180. So 90° = π/2 rad and 1 rad ≈ 57.30°. sin(30) is 0.5 in DEG mode but −0.988 in RAD mode — always check the mode!
Laws of logarithms
- log(ab) = log a + log b
- log(a/b) = log a − log b
- log(aⁿ) = n·log a
- Change of base: logbx = log x ÷ log b
Permutations & combinations
nPr = n! ÷ (n − r)!
nCr = n! ÷ (r! (n − r)!)
Arranging 2 of 5 books on a shelf: 5P2 = 20 ways. Choosing 2 of 5 friends: 5C2 = 10 ways (order doesn't matter).
Why do some inputs give an error?
Some operations have no real answer: dividing by 0, √ of a negative number, log of 0 or a negative number, tan 90°, and sin⁻¹ of values outside −1 to 1. The calculator tells you exactly which rule was broken.
Scientific Calculator — your questions
What is the difference between DEG and RAD mode?
Degrees split a full turn into 360 parts, radians into 2π. School trigonometry up to Class 10 uses degrees. The same input gives different answers in each mode: sin(30) is 0.5 in DEG but −0.988 in RAD. Always check the mode indicator before trusting a trigonometric answer.
How do I convert degrees to radians?
Multiply the degrees by π/180, because π radians equals 180 degrees. So 90° = 90 × π/180 = π/2 radians, and 60° = π/3. To go the other way, multiply the radians by 180/π, which makes 1 radian about 57.30°. Angles in calculus and in Class 11 graph questions are almost always in radians, so convert before you substitute.
What is the difference between nPr and nCr?
nPr counts arrangements where order matters and equals n! ÷ (n − r)!. nCr counts selections where order does not matter and equals n! ÷ (r!(n − r)!). Arranging 2 of 5 books on a shelf gives 5P2 = 20 ways, while choosing 2 of 5 friends gives 5C2 = 10 ways.
What are the laws of logarithms?
log(ab) = log a + log b, log(a/b) = log a − log b, and log(aⁿ) = n × log a. To change base, use log_b x = log x ÷ log b. On this calculator, log means base 10 and ln means base e, so log(1000) = 3 and ln(e) = 1.
Why does my calculation show an error?
Some operations have no real answer. Dividing by zero, taking the square root of a negative number, log of zero or a negative number, tan 90°, and sin⁻¹ of a value outside −1 to 1 all fail. The calculator names the rule that was broken so you can see which part of the expression to fix.
Are calculators allowed in CBSE board exams?
Calculators are not permitted in CBSE board examinations up to Class 12. Use this tool to check answers you have already worked out by hand and to spot patterns such as sin²θ + cos²θ = 1, rather than as a substitute for practice with pen and paper.