Addition of 3 digits calculator is a simple tool to calculate the sum of 2 three-digit numbers instantly. The 3 digit addition calculator consists of a total of 6 input boxes (three in each row). In the first row, it is mentioned “First Number” and in the second row, “Second Number” is mentioned.
In the first row, enter the first three-digit number and in the second row, enter the second three-digit number. The input boxes across the first and the second numbers represent “thousands place”, “hundreds place”, and “units place”. It should be noted that only three digits number should be entered.