How do I add or take off a percentage?+−
Type it the way you say it: 200 + 10% gives 220 and 200 − 10% gives 180, because a percentage after plus or minus means that percent of the number before it - the way phone calculators work. Everywhere else 10% is just 0.1, so 200 × 10% is 20.
Degrees or radians?+−
Use DEG for angles measured in degrees (a right angle is 90) and RAD for radians (a right angle is π/2). The choice applies to sin, cos and tan and to the angle that sin⁻¹, cos⁻¹ and tan⁻¹ give back. A degree sign always means degrees: sin(30°) is 0.5 in either mode.
In what order does it calculate?+−
Brackets first, then powers, then multiplication and division, then addition and subtraction (BODMAS / PEMDAS). Powers group from the right, so 2^3^2 is 2^9 = 512, and a minus sign in front is applied after the power, so −2² is −4. Multiplication without a sign, as in 2π or 3(4+1), counts as an ordinary ×.
Why does 0.1 + 0.2 show 0.3 and not 0.30000000000000004?+−
Computers store most decimals as tiny binary approximations, and a careless calculator shows that leftover. Results here are rounded to 12 significant digits, like a handheld calculator, while the next step keeps working with full precision.
Which functions can I type?+−
sin, cos, tan and their inverses (asin or sin⁻¹), sinh, cosh, tanh, ln, log (base 10), log2, logb(base, x), sqrt or √, cbrt or ∛, root(n, x), abs, exp, round, floor, ceil, x! (fractions too), nCr, nPr, gcd, lcm and mod, plus π, e and Ans for the last result. Large and small numbers can be written as 1.5E-7.
Can I use a comma as the decimal point?+−
Yes. The calculator follows the language of the page: where 1,5 is one and a half, the comma is the decimal point and arguments are separated with a semicolon, as in nCr(5;2) - the same as in a spreadsheet. A dot typed as the decimal point still works.
Is my history saved?+−
Only in this browser on this device, so it's still there after a reload. Nothing you type is sent anywhere. Clear history removes it.