Circle Calculator User Guide
Use our free online circle calculator to quickly calculate the circumference and area of a circle. Simply enter the radius or diameter, and get instant results.
Results Include:
- Circumference (C = 2πr)
- Area (A = πr²)
- π (Pi) ≈ 3.14159
How to Use:
- Select calculation method (radius or diameter)
- Enter the value you know
- Choose the unit of measurement
- Click "Calculate" button
- Get instant results for circumference and area
Example: Enter radius = 5 cm, results:
- Circumference: 31.42 cm
- Area: 78.54 cm²
Formulas:
- Circumference: C = 2πr = πd
- Area: A = πr²
- π (Pi) ≈ 3.14159265...
Common Uses:
- Math homework and exam preparation
- Engineering and design projects
- DIY crafts and circular material calculation
- Everyday life: pizza size, garden beds, pools
