Geometry & dimensions
Work with shapes and coordinates using explicit units. Work stays in your browser tab.
Circle arc length
Find arc length and sector area from radius and a central angle.
Ring area calculator
Find material area between concentric circles.
Ellipse area calculator
Find ellipse area from its major and minor full axis lengths.
Trapezoid area calculator
Find area between parallel sides with a perpendicular height.
Triangle area from three sides
Find triangle area using Heron’s formula after checking the triangle inequality.
Sphere volume and surface
Find volume and surface area of a sphere from its radius.
Cone volume and surface
Find volume and lateral surface of a right circular cone.
Cylinder volume and surface
Find the capacity and surface area of a closed right circular cylinder.
Conical frustum volume
Find the volume of a cone truncated between parallel circular faces.
Regular polygon dimensions
Find perimeter and area of a regular polygon with equal sides.
Distance between coordinates
Find Euclidean distance and midpoint for two planar coordinates.