Geometry Calculators
Free geometry tools for circles, rectangles, right triangles, triangles, cylinders, spheres, cones, trapezoids and square footage — diameter, circumference, area, perimeter, diagonal, Pythagorean theorem, Heron's formula, volume, slant height, surface area and conversions to square meters and acres. Every calculator is free, instant and private.
Circle Calculator
Diameter, circumference and area from the radius.
Pythagorean Theorem
Find the hypotenuse or a missing leg of a right triangle.
Triangle Area Calculator
Area from base and height, or from three sides with Heron's formula.
Rectangle Calculator
Area, perimeter and diagonal from length and width.
Cylinder Calculator
Volume and total surface area from radius and height.
Sphere Calculator
Volume and surface area from the radius.
Cone Calculator
Volume, slant height, and lateral and total surface area from radius and height.
Trapezoid Calculator
Area and median (midsegment) from the two parallel sides and height.
Triangle Calculator
Solve any triangle from 3 values — SSS, SAS, ASA, AAS and the ambiguous SSA case.
Square Footage Calculator
Area in square feet, square meters and acres from length and width in ft, in, yd or m.
Circumference Calculator
Circumference of a circle from radius, diameter, area, or circumference itself.