Mathlean · Online math workspace
Complex conjugate calculator
Reflect a complex number across the real axis.
How to use this calculator
Edit Conjugate(3+4i); it returns 3−4i.
Tap the math below to edit it and see the result. Once a result is ready, press Tab on a hardware keyboard to accept it. Outside a matrix, Return completes the line; the phone math keyboard has the same Return action.
Try it here
Interactive tools require JavaScript. You can read the guide and example without it.
What to know
Conjugation changes the sign of the imaginary part, not the sign of the entire number.
Mathlean combines visual mathematical input with computation and canvas tools. Results depend on the expression and available engine support; check important answers independently.