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Sum of Positive Integers Calculator

n1:
n2:

About This Tool

The online Sum of Positive Integers Calculator is used to calculate the sum of first n numbers or the sum of consecutive positive integers from n1 to n2.

Sum of Consecutive Positive Integers Formula

The sum of the first n numbers is equal to:

n(n + 1) / 2

The sum of consecutive positive integers from n1 to n2 is equal to:

n1 + (n1 + 1) + ... + n2 = n2(n2 + 1) / 2 - n1(n1 - 1) / 2

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