How can I write an algorithm that calculates the factorial of a number? Answer 14 Follow Request More Ad by Jigsaw Academy Accelerate your career with India's premier analytics institute. Stand out from the crowd and become job-ready with our exclusive PGDPM program in Bengaluru. Learn More 12 ANSWERS  Nishan Pantha, computer engineer, developer, programmer, dynamic programming Answered Sep 18, 2015 Here I am not going to write some code because you havent mentioned about the "programming language". Basically for factorial you just have to multiply all the numbers from 1 to the given number which is just a simple paper-pencil technique. So, the algorithm for the factorial goes like this: input a number n set variable final as 1final <= final * n decrease n check if n is equal to 0if n is equal to zero, goto step 8 (break out of loop)else goto step 3 print the result final By Nishan Pantha