Our sector area calculator can help you calculate the area of a sector. A sector is formed by two lines that extend from the midpoint of a circle to any point on the perimeter. In simple terms it looks like a slice of pie. If the two lines are formed at a 180 degree angle then the sector is often referred to as a semi-circle.

To figure the area of a sector simply use our sector area calculator. The formula is a little complicated to do in your head. To better understand how to calculate the area of a sector it is important to understand that the angle formed by the two straights sides of the sector is proportional to the are of the circle. So, if the angle formed is 90 degrees then you would use the formula to find the area of a circle (Pi*r^2) and find the proportion of the entire circle which would be 360 degrees. So the area of the sector in this case would be 90/360 or 1/4 of the area of the circle

To use the sector area calculator simply enter the required information into the form fields and our calculator will take care of the complicated calculations for you. There is no need to try to remember this confusing formula. Although we do recommend you try to memorize the formula and understand it if you are a student using this as an education resource.