Geometry Calculators
6 free geometry calculators — all with step-by-step working shown
Calculate area, perimeter, volume and more for all shapes.
Area Calculator
Calculate the area of any 2D shape with working shown
Perimeter Calculator
Calculate the perimeter of any 2D shape with working
Volume Calculator
Calculate the volume of any 3D shape with working shown
Circle Calculator
Find radius, diameter, area and circumference instantly
Pythagoras Theorem Calculator
Find any side of a right triangle using a² + b² = c²
Surface Area Calculator
Calculate the surface area of any 3D shape with working
Why step-by-step working matters
Geometry calculators for every 2D and 3D shape. Find area and perimeter for triangles, circles, rectangles and more. Calculate volume and surface area of 3D shapes. The Pythagoras theorem calculator — named after our brand — shows the famous a² + b² = c² proof step by step.
Unlike calculators that show only the final answer, every Pythagorist tool displays the complete method — the same working you would write in an exam. This means you can understand the process, not just copy a number. Students who understand the method score more marks, because examiners award points for correct working even when the final answer contains an arithmetic error.