Complex Number Addition Calculator Add Two Complex Numbers Enter two complex numbers in the form a + bi and click Calculate . Example: 3 + 2i, 1 - 5i Calculate Sum Result will appear here. Note: Adding complex numbers means adding the real parts together and the imaginary parts together. Complex Number Addition – Complete Explanation A complex number is a number of the form a + bi , where a is the real part , b is the imaginary part , and i is the imaginary unit with the property i² = -1 . Adding complex numbers is straightforward: simply add the corresponding real parts and imaginary parts separately. Complex Addition Rule (a + bi) + (c + di) = (a + c) + (b + d)i Addition is commutative and associative: z₁ + z₂ = z₂ + z₁ and (z₁ + z₂) + z₃ = z₁ + (z₂ + z₃) 1. Steps to Add Complex Numbers Identify the real parts of both complex numbers Identify the imaginary parts of both complex numbers Add the real parts together Add the ...