Sum of Integers

Sum 1+2+...+n

Sum
—

Sum 1 to n

S = n(n+1)/2

Quick Tips

  • Double-check your inputs for accurate results
  • Use parentheses to clarify order of operations
  • Results are rounded — consider significant figures

Frequently Asked Questions

n(n+1)/2

Related Calculators

Percentage Calculator

Calculate percentages of any number

Percentage Change Calculator

Calculate percentage increase or decrease between two values

Percentage Difference Calculator

Calculate the percentage difference between two values

Percentage Increase Calculator

Calculate percentage increase from original to new value

Popular in Math