Calculator: how it works
Switch between Basic for everyday sums and Scientific for trigonometry, logarithms, powers, roots and factorials. It follows the normal order of operations: brackets, then powers, then × and ÷, then + and −. So −2² is −4 and 2³² (2^3^2) is 512.
Trig functions work in degrees or radians: choose Degrees or Radians above the keys to switch. A number next to a bracket, π or a function multiplies, so 2π and 3 sin(30) work as written. The % key divides by 100, so 50% × 200 = 100.
On a keyboard, use * for ×, / for ÷, ^ for powers, ! for factorial, Enter for equals, Backspace to delete and Esc to clear.
Calculator FAQs
Does it use degrees or radians?
Degrees by default, which suits most school and trade maths. Choose Radians above the keys to switch; your choice is remembered on this device.
Why does it say Math error?
The input has no real answer, such as the square root of a negative number, the log of 0, tan 90° or the factorial of a fraction.
Is anything I type saved or sent anywhere?
No. Everything runs in your browser. The tape of recent sums is cleared when you leave the page.
Why does 0.1 + 0.2 show 0.3?
Results are rounded to 15 significant digits to hide the tiny floating-point errors common in computer arithmetic. Very large and very small results are shown in scientific notation.