Circle Area Calculator

Calculate circle area using radius, diameter, or circumference. Visual representation with full breakdown.

Calculate Using *

Output Unit

Radius (r) *

units

Distance from center to edge

Decimal Precision

Show π Value

⚠️

Circle Area

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⭕

Circle Visualization

Graphical representation of your circle

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📋

Calculation Breakdown

Step-by-step area calculation

⭕

Area

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A = πr²

📏

Radius

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r = d/2

📐

Diameter

—

d = 2r

🔄

Circumference

—

C = 2πr

📖

Circle Formulas

All related circle calculations

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Circle Geometry Tips

Understanding circle area

⭕ Mathematical Disclaimer: This circle area calculator uses standard geometric formulas. Results are for educational purposes. Ensure measurements use consistent units. π is approximated to the selected precision.