Calculate the Sum

Calculator for the summation with the sum symbol Sigma, Σ. The sum is a repeated addition with a start value m and an end value n. As running variable, which is increased by 1 in each step, i is used, this must be an integer. Only this variable may occur in the sum term. The basic arithmetic operations + - * / are allowed, as well as the power function, like pow(2#i) for 2ⁱ. Further allowed functions are sin(), cos(), tan(), asin(), acos(), atan(), log() for the natural logarithm and fac() for the factorial. Also, the constants e and pi can be used.

Example: with m=1 and n=10, Σ i = 1+2+3+4+5+6+7+8+9+10 = 55
1/fac(i) with m=0 is one definition of Euler's number e.

An infinite sum is called series.