Complex Conjugate Calculator a+bi → a−bi. a b Conjugate 3-4i Step-by-step with your numbers: 1. Values used: 2. a = 3 3. b = 4 4. Conjugate = 3-4i Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! Flip the sign of the imaginary part. FAQ Use? Division of complex numbers. Related calculators Complex Number Magnitude |a+bi| = √(a²+b²). Complex Number to Polar Form a+bi → r∠θ.