If the surface is complex in shape, it may be possible to section the surface into simple shapes and add their square footages together. The formula for calculating the area of a circle is pi times radius squared. So, to find the area of a circle in square feet, follow these steps: 1. Then click Calculate. To work out your cost of materials, simply multiply this figure by your 'cost per square feet'. π is the symbol for pi (3.14159265). For example, if the circle's diameter equals 4.5 feet, divide 4.5 by 2 to get 2.25 feet for the radius. A circle is the set of all points on a plane with the same distance (the radius) to a certain point, which is called center. Favorite Answer. Enter one value and choose the number of decimal places. The area of a circle is pi times the square of its radius. radius = 8 feet. How to calculate square footage for rectangular, round and bordered areas. This gives you your square feet figure (ft 2). π is the symbol for pi (3.14159265). This is the length of the line from the middle of the circle to any point on its edge. To work out your cost of materials, simply multiply this figure by your 'cost per square feet'. So your radius measurement of 9 inches equals .75 feet. This gives you your square feet figure (ft 2). Relevance. Circumference, diameter and radii are calculated in linear units, such as inches and centimeters. The circumference is defined to be c=2πr. The formula for calculating the area of a circle is: π r 2 (with r being the radius of the circle, which is half the diameter). The radius of a one foot diameter circle it 1/2 or .5 feet. Then click Calculate. where the circumference is equal to 2 times pi times the radius If the diameter is 5ft then the radius is 2.5 ft (r=d/2) r=2.5 ft π≈3.1415926535898- c=2πr c=2π(2.5) c=5π c≈15.708 ft. Calculate square feet, meters, yards and acres for flooring, carpet, or tiling projects. A circle has many different radii and many different diameters, and each one passes through the center. Calculate square footage, square meters, square yardage and acres for home or construction project. If you need to convert into feet from another unit of measure, you can do it before or after performing this calculation; just make sure you always label your calculations with … Find the radius, circumference, and area of a circle if its diameter is equal to 10 feet in length. A circle has many different radii and many different diameters, and each one passes through the center. The radius of a circle is the distance from the … For instance if your radius measures 9 inches, you convert from inches to feet by dividing the radius by 12 because there are 12 inches in a foot. The radius is half the diameter, so the radius is 5 feet, or r = 5 . Square Footage Calculator. 5 Answers. Answer Save. Conversion factors: To convert among square feet, square inches, square yards, square centimetres, square millimetres and square meters you can utilize the following conversion table. Circle Calculator. When you first learned to calculate two-dimensional area, you probably practiced with squares and rectangles, using the simple formula length × width.There's a simple formula for determining the area of a circle in square feet too but, instead of length or width, you need to know the radius of the round area. Calculate the area of a pool so you'll know how much land a round pool will take up on your property. Our calculator gives you the option of calculating the exact cost of materials. Circle: A = πr 2 (Pi x Radius Squared) How To Calculate Square Footage. diameter = 16 feet. Determining the square feet of a circular pool is the same as determining the area of a circle. (Or, equivalently, measure the diameter and divide by two.) The Square Footage Calculator estimates the square footage of a lot, house, or other surfaces in several common shapes. Circle calculator, formula, work with steps, step by step calculation, real world and practice problems to learn how to find the area, circumference & diameter of a circle in inches, feet… Use a ruler or similar tool to measure the radius of the circle. Yes, it is that awesome. Calculations at a circle. This is a useful home tool that you can use whenever you need to compute an area, from when you are about to tile a floor, seed a lawn or to estimate wallpaper amount and started wondering how to calculate square footage. Circle area calculator and circumference calculator provide you with a simple way of determining the square footage area for various shapes. If however the circle is 6 feet circumference you need to find the diameter first. If the radius of the circle was measured in inches, multiply the number by 0.0833333 using the calculator. 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