Hi there, I was wondering if someone could help clarify something for me. I am using excel to find the area under a curve. I am using the : (B1+B2)/2*(A2-A1) equation to do it. However, due to the nature of the graph, all the value I am getting are negative. The values on the X axis decrease as the value on the Y axis increase and thus A2- A1 value are always negative giving a negative results to all my values. I am wondering, do I just ignore the minus sign and just take the number itself as the area under curve? The final value I got attained by summation was -3153. My apology if the answer is straightforward. I have been away from this area for many years and I am very rusty. Thank you in advanced and I do apologise if the thread was not posted in the right section.