831: This represents "love" because there are 8 letters in "love," 3 letters in "you," and 1 letter in "I." 3811: This represents "you" because there are 3 letters in "you," 8 letters in "love," and 1 letter in "I." So, on a calculator, you can spell "I love you" as 143 831 3811.
Love calculation by a love calculator is based on certain algorithm. Once two names are entered, this calculator matches the name of the first person against some love, romance and relationship related parameters. Similarly the name of your partner/lover is matched against the same parameters.