△ Area, Perimeter & Volume
Find the area, perimeter, surface area or volume of common shapes and solids, from rooms and plots to tanks and cones. Enter dimensions in any unit and switch the result between square feet, square meters, gallons, liters and more. Formulas come from the free OpenStax textbooks.
20 free area, perimeter & volume calculators
Annulus (Ring) Area CalculatorFind the area of a ring (annulus) between two circles, plus ring width and both circumferences, from inner and outer radius.Box Volume CalculatorVolume, surface area and space diagonal of a box or rectangular prism, in cubic feet, cubic meters, liters or gallons.Capsule Volume CalculatorVolume and surface area of a capsule (a cylinder with hemispherical ends), such as a propane tank or pill, from its radius and overall length.Circle CalculatorCalculate a circle’s area, circumference, diameter and radius from any one of radius, diameter or circumference.Cone CalculatorVolume, slant height, lateral and total surface area of a right circular cone from its base radius and height.Cylinder Volume CalculatorVolume and surface area of a cylinder from radius or diameter and height, in cubic feet, liters or gallons.Ellipse CalculatorCalculate the area, exact perimeter (circumference), eccentricity and focal distance of an ellipse or oval from its semi-axes.Frustum (Truncated Cone) CalculatorVolume, slant height and surface area of a conical frustum (truncated cone) such as a bucket, planter or lampshade, from both radii and the height.Pyramid Volume CalculatorVolume and surface area of a right rectangular or square pyramid from base length, base width and height.Rectangle CalculatorFind the area, perimeter and diagonal of a rectangle or square from its length and width, in any units.Regular Polygon CalculatorArea, perimeter, apothem, circumradius and interior angle of a regular polygon (pentagon, hexagon, octagon…) from side length.Right Triangle & Pythagorean Theorem CalculatorSolve a right triangle with the Pythagorean theorem: find the hypotenuse or missing leg, both angles, area and perimeter.Sector Area & Arc Length CalculatorArea, arc length, chord and perimeter of a circular sector (pie slice) from its radius and central angle or arc length, plus the segment area.Slope CalculatorTurn rise and run into slope percent (grade), angle in degrees, 1:x ratio, pitch per 12 and slope length.Sphere CalculatorVolume, surface area, diameter and circumference of a sphere or ball from its radius, diameter or circumference.Square Footage CalculatorCalculate square footage of rooms, floors and yards. Add up to three areas (rectangle, circle or triangle) and get ft², m², yd² and cost.Tank Volume CalculatorTotal and filled volume of vertical cylinder, horizontal cylinder or rectangular tanks in gallons and liters from liquid depth.Torus CalculatorVolume and surface area of a torus (ring or doughnut shape) from its major and minor radii, plus its inner and outer diameters.Trapezoid Area CalculatorFind the area of a trapezoid from its two parallel sides and height, plus the median and isosceles leg and perimeter.Triangle CalculatorEnter three sides to get a triangle’s area (Heron’s formula), perimeter, all three angles and its type.