Geometry — Math
This directory groups geometry tools within Math. A mathematical answer should be independent of your country. These tools cover arithmetic, algebra, geometry, fractions and statistics, along with financial mathematics that uses rates you enter yourself. Begin with the quantity you need to find, then check the required units and whether the formula assumes a particular timing convention. A loan-growth example using an entered rate is not a statement about a lender’s current offer.
Start with these tools
Annulus Calculator
Calculate the area and boundary lengths of a ring between two concentric circles.
Area Calculator
Calculate area for rectangles, triangles, trapezoids, circles, sectors, ellipses, and parallelograms.
Circle Calculator
Provide a radius, diameter, circumference, or area to calculate every main circle measurement.
Distance Calculator
Calculate distance in 2D, 3D, or between two latitude/longitude coordinates on Earth.
Pyramid Frustum Calculator
Calculate volume and surface area for a square-pyramid frustum.
For geometry, use the same length unit throughout an example. For statistics, distinguish a population from a sample and check how missing values are handled. Fraction and significant-figure tools answer different questions: an exact numerical value does not by itself tell you the precision of a measurement. The formula notes explain those distinctions. Work through a small example before trusting a large result, keep intermediate precision where possible, and round only for the intended presentation. Saved input links are convenient but are not private storage; anyone receiving a link can inspect the values it contains.
geometry
Annulus Calculator
Calculate the area and boundary lengths of a ring between two concentric circles.
Area Calculator
Calculate area for rectangles, triangles, trapezoids, circles, sectors, ellipses, and parallelograms.
Circle Calculator
Provide a radius, diameter, circumference, or area to calculate every main circle measurement.
Distance Calculator
Calculate distance in 2D, 3D, or between two latitude/longitude coordinates on Earth.
Pyramid Frustum Calculator
Calculate volume and surface area for a square-pyramid frustum.
Regular Polygon Calculator
Calculate perimeter, area, apothem, circumradius, and angles from side count and side length.
Rhombus Calculator
Calculate rhombus area and perimeter from diagonals or from side and height.
Right Triangle Calculator
Solve a right triangle from two known values and calculate all sides, acute angles, altitude, area, and perimeter.
Stadium Calculator
Calculate area and perimeter of a stadium shape: a rectangle capped by two semicircles.
Surface Area Calculator
Calculate total and component surface areas for nine common three-dimensional shapes.
Triangle Calculator
Solve a general triangle from three known values, including at least one side, and calculate sides, angles, area, radii, and medians.
Triangular Prism Calculator
Calculate volume and surface area of a triangular prism from triangle sides, triangle height, and prism length.
Volume Calculator
Calculate volume and related surface measurements for eleven common three-dimensional shapes.
Frequently asked questions
How do I choose a tool from Geometry — Math?
Start with the quantity you need to solve for, then compare the required inputs and assumptions before entering values.
Are results in Geometry — Math guaranteed?
No. Read the formula, limitations and reference information on the individual calculator. Entered example rates are not current offers or professional advice.
Can I save a calculation from Geometry — Math?
The calculator pages support browser-local project and share controls. Shared links and exported files may contain your inputs.