Geometry Calculators -

Welcome to Sigma Calculator’s free geometry calculators — your shortcut to solving problems involving area, perimeter, volume, angles, and shapes. Whether you’re a student working through homework, a teacher preparing lessons, an engineer refining a design, or a DIY enthusiast planning a home project, these tools turn tedious manual math into instant, accurate answers.

Geometry is everywhere in daily life: measuring a room for new flooring, estimating the concrete needed for a patio, finding the volume of a water tank, or calculating the perfect angle for a woodworking cut. Doing this math by hand means juggling formulas for triangles, circles, rectangles, cubes, spheres, cylinders, cones, and pyramids — and a single slip can throw off an entire project. Our calculators apply the correct formulas automatically; you simply enter your measurements and get precise results in seconds.

From basic 2D shapes to 3D solids, from the Pythagorean theorem to angle conversions and distances between points, this hub brings together the geometry tools you’ll reach for again and again. Every calculator is completely free, works beautifully on phones, tablets, and desktops, and needs no sign-up or download. Formulas are verified against standard mathematical references, so every result is trustworthy. Bookmark this page and explore our growing library of geometry calculators — designed to make geometry simple, fast, and accessible to everyone.

Available Geometry Calculators

Area Calculator — Calculate the area of common 2D shapes instantly.
Circle Calculator — Find the radius, diameter, circumference and area of a circle.
Cube Calculator — Compute the volume and surface area of a cube.
Hypotenuse Calculator — Find the hypotenuse of a right triangle instantly.
Pythagorean Theorem Calculator — Solve for any missing side of a right triangle.
Sphere Calculator — Calculate the volume and surface area of a sphere.
Square Footage Calculator — Measure room and project areas in square feet.
Tank Volume Calculator — Find the volume of cylindrical and rectangular tanks.
Trapezoid Calculator — Calculate the area and perimeter of a trapezoid.
Triangle Calculator — Solve triangle sides, angles, area and perimeter.
Volume Calculator — Compute the volume of 3D shapes and solids.
Slope Calculator — Find the slope, angle and equation of a line.

Frequently Asked Questions

What can I calculate with these geometry calculators?

You can solve for area, perimeter, circumference, surface area, volume, angles, diagonal lengths, and other properties of 2D and 3D shapes — all with instant results.

Which shapes are supported?

Our collection covers triangles, squares, rectangles, circles, trapezoids, cubes, spheres, cylinders, cones, pyramids, and regular polygons — with more shapes added regularly.

Are these geometry calculators really free?

Yes. Every calculator on Sigma Calculator is 100% free — no sign-up, no downloads, no hidden limits, and no watermarks on your results.

Can I use them on my phone or tablet?

Absolutely. All of our calculators are fully responsive and work flawlessly on phones, tablets, laptops, and desktops.

How accurate are the results?

Very accurate. Every formula is checked against standard mathematical references, so students, teachers, and professionals can rely on every number.