Circle & Sphere Calculator

Calculate area, circumference, diameter, and volume from radius or diameter

Input

Enter radius or diameter to calculate

Visual Diagram

r = 10d = 20

Circle Calculations

Radius (r)
10 units
Diameter (d)
20 units
d = 2r
Circumference (C)
62.8319 units
C = 2πr
Area (A)
314.1593 units²
A = πr²

Sphere Calculations

Surface Area (SA)
1256.6371 units²
SA = 4πr²
Volume (V)
4188.7902 units³
V = (4/3)πr³

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About Circle & Sphere Calculator

Calculate Circle and Sphere Properties

This calculator helps you find all the important properties of circles and spheres. Simply enter the radius or diameter, and get instant calculations for area, circumference, volume, and surface area with formulas.

Features

  • Input by radius or diameter
  • Circle area calculation
  • Circle circumference calculation
  • Sphere volume calculation
  • Sphere surface area calculation
  • Visual diagram with measurements
  • Formulas displayed for each result
  • High precision calculations
  • Real-time updates
  • Clean, modern interface

Circle Formulas

Diameter: d = 2r
Radius: r = d/2
Circumference: C = 2πr = πd
Area: A = πr²

Sphere Formulas

Surface Area: SA = 4πr²
Volume: V = (4/3)πr³

How to Use

  1. Choose whether to input radius or diameter
  2. Enter your measurement value
  3. View all calculated properties instantly
  4. Check the visual diagram for reference
  5. Use the formulas to understand the calculations

Common Uses

  • Geometry homework and assignments
  • Engineering and design calculations
  • Architecture and construction planning
  • Physics and mathematics problems
  • Educational purposes and learning

Note

All calculations use the mathematical constant π (pi ≈ 3.14159). Results are displayed with up to 4 decimal places for precision. The units shown are generic - apply your specific units (cm, m, inches, etc.) as needed.