Geometry Calculators

Geometry Calculator

Use these geometry calculators with steps to check results, units, formulas, and reverse calculations for common shapes.

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Direct answer

What does the geometry calculator solve?

The geometry calculator solves common 2D and 3D shape problems with formulas and steps. It includes circle, triangle, rectangle, square, cylinder, cone, and sphere calculators, and each result shows the answer, unit, formula used, and step-by-step substitution. Use it to check homework, reverse calculations, unit-labeled answers, and shareable result URLs quickly.

Quick formula table

Calculator formulas

Calculator	Formula	What it finds
Circle	$A = π r^{2}$	Area
Circle	$C = 2 π r = π d$	Circumference
Circle	$d = 2 r$	Diameter
Triangle	$A = \frac{1}{2} \times b \times h$	Area
Triangle	$P = a + b + c$	Perimeter
Triangle	$a^{2} + b^{2} = c^{2}$	Right triangle hypotenuse
Rectangle	$A = l w$	Area
Rectangle	$P = 2 (l + w)$	Perimeter
Rectangle	$d = l^{2} + w^{2}$	Diagonal
Square	$A = s^{2}$	Area
Square	$P = 4 s$	Perimeter
Square	$d = s 2$	Diagonal
Cylinder	$V = π r^{2} h$	Volume
Cylinder	$L S A = 2 π r h$	Lateral surface area
Cylinder	$T S A = 2 π r (r + h)$	Total surface area
Cone	$V = \frac{1}{3} π r^{2} h$	Volume
Cone	$l = r^{2} + h^{2}$	Slant height
Cone	$T S A = π r (r + l)$	Total surface area
Sphere	$V = \frac{4}{3} π r^{3}$	Volume
Sphere	$S A = 4 π r^{2}$	Surface area
Sphere	$d = 2 r$	Diameter

Calculator

Circle Calculator

Results include the answer, unit, formula, and calculation steps.

Calculator

Triangle Calculator

Results include the answer, unit, formula, and calculation steps.

Calculator

Rectangle Calculator

Results include the answer, unit, formula, and calculation steps.

Calculator

Square Calculator

Results include the answer, unit, formula, and calculation steps.

Calculator

Cylinder Calculator

Results include the answer, unit, formula, and calculation steps.

Calculator

Cone Calculator

Results include the answer, unit, formula, and calculation steps.

Calculator

Sphere Calculator

Results include the answer, unit, formula, and calculation steps.

Formula reference

Related formula pages

FAQ

Geometry Calculator FAQ

What does the geometry calculator show?

Each calculator shows the result, unit, formula used, and step-by-step calculation.

Can I use different units?

Yes. Enter the unit label you want, but keep all measurements in the same unit.

Does the calculator replace learning formulas?

No. It is designed to support the formula pages by showing how the formulas are applied.