A full scientific calculator: trig, inverse and hyperbolic functions, logarithms, powers, factorials, permutations and combinations, with history and memory.
M
History
Use it as a stand-alone app
To install: use the browser menu, "Install app" or "Add to home screen". It then works offline.
Keyboard: digits and operators, Enter for the result, Esc to clear, Backspace to delete.
Formula
The scientific calculator reads the whole expression and follows the standard order of operations: brackets, then functions, powers, multiplication and division, and finally addition and subtraction. Powers group from the right, so 232=29.
(rn)=r!(n−r)!n!nPr=(n−r)!n!
Trigonometric functions convert degrees to radians with θrad=θdeg⋅π/180 when DEG is selected. Results are rounded to 14 significant digits so values such as sin(180) show 0 and not a tiny leftover.
Worked example
Find the height of a tree from 20 m away when the angle to its top is 35 degrees and your eyes are 1.6 m above the ground.
Type 20 × tan(35) + 1.6 and press =.
tan(35) is 0.7002, so 20 × 0.7002 = 14.004, and adding the eye height gives 15.604.
The tree is about 15.6 m tall.
To see the same answer in scientific notation, press the display button until it shows SCI.
Common mistakes
Leaving the angle unit on RAD when the problem is in degrees. Check the DEG / RAD button first; it is the most common source of wrong trig answers.
Typing the power key and the number in the wrong order. Write 2 ^ 10, not 10 ^ 2, to get 1024.
Expecting 5 % to mean 5 per cent of something. Here % simply divides by 100, so 200 × 5 % is 10.
Using nPr or nCr with a fraction or a negative number. Both are defined only for whole numbers.
Frequently asked questions
Do the trig keys use degrees or radians?
Whichever the DEG / RAD button shows. It starts in degrees, so sin(30) is 0.5. Switch to RAD and sin(pi/6) gives 0.5. Inverse functions such as sin⁻¹ return their answer in the same unit.
Do I have to close every bracket?
No. Open brackets are closed for you when the result is calculated, so sin(30 and sin(30) give the same answer.
How do I continue from the previous answer?
After pressing = just type an operator, for example + 5, and the calculator starts from the last answer. You can also press Ans, or click any line in the history to bring its expression back.
What do nPr and nCr mean?
nPr counts ordered arrangements of r items taken from n, and nCr counts unordered selections. npr(5, 2) is 20 and ncr(5, 2) is 10. Both need whole numbers with r no larger than n.
Can I type instead of clicking?
Yes. The expression box takes the keyboard directly, including function names such as sin( and sqrt(. Enter calculates, Esc clears, and Backspace removes a whole function name in one press. On a phone the on-screen keypad is used so the system keyboard does not cover the calculator.