Geometry Calculators
Solve area, volume, triangles and circles with the correct formula every time.
Updated June 2026 · Free · No sign-up
Geometry covers the measurement of shapes in two and three dimensions, from the area of a circle to the volume of a cone and the angles inside a triangle. This cluster gathers the calculators you reach for in school and college maths, including the Area calculator, Volume calculator, Surface Area calculator and the dedicated Circle calculator.
Each tool applies the standard textbook formula and shows the working, so you can check homework as well as get an answer. The Triangle and Right Triangle calculators solve sides and angles, the Pythagorean Theorem calculator finds a missing side of a right triangle, and the Slope and Distance Formula calculators handle coordinate geometry between any two points.
All Geometry Calculators
Area Calculator
Calculate area of circle, rectangle, triangle, trapezoid, and other shapes.
Volume Calculator
Calculate volume of cube, sphere, cylinder, cone, and other 3D shapes.
Triangle Calculator
Calculate triangle sides, angles, area, and perimeter with any known values.
Pythagorean Calculator
Find the hypotenuse or legs of a right triangle using the Pythagorean theorem.
Circle Calculator
Calculate area, circumference, diameter, and radius of a circle from any one known value.
Surface Area Calculator
Calculate surface area of sphere, cylinder, cone, cube, and rectangular prism.
Right Triangle Calculator
Calculate all sides and angles of a right triangle from any two known values.
Slope Calculator
Calculate slope, y-intercept, and line equation between any two coordinate points.
Distance Formula Calculator
Calculate distance between two points on a coordinate plane using the distance formula.
Frequently asked questions
What is the formula for the area and circumference of a circle?
The area of a circle is A = pi r squared, and its circumference is C = 2 pi r, where r is the radius. If you only know the diameter d, use r = d / 2, so the circumference can also be written as C = pi d. Our Circle calculator finds all of these from any single known value.
How does the Pythagorean theorem find a missing side?
For a right triangle with legs a and b and hypotenuse c, the theorem states a squared + b squared = c squared. To find the hypotenuse, compute c = the square root of (a squared + b squared); to find a leg, rearrange to a = the square root of (c squared - b squared). It only applies to right-angled triangles.
What is the difference between area, surface area and volume?
Area measures the space inside a flat 2D shape and is given in square units such as square cm. Surface area is the total area of all the faces of a 3D solid, also in square units, while volume measures the space a 3D solid contains and is given in cubic units such as cubic cm. For a sphere of radius r, surface area is 4 pi r squared and volume is (4/3) pi r cubed.
How do you calculate the slope of a line between two points?
The slope m between points (x1, y1) and (x2, y2) is the change in y divided by the change in x: m = (y2 - y1) / (x2 - x1). A positive slope rises left to right and a negative slope falls; a horizontal line has slope 0, while a vertical line has an undefined slope because x2 - x1 equals zero.
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