Diameter to Area Calculator
Area \( A = \pi \times \left(\frac{D}{2}\right)^2 = \frac{\pi D^2}{4} \)
Having a set of pre-calculated values can speed up your calculations and provide quick approximations for common diameters.
Table 1: Area by Diameter (Metric Units - meters)
| Diameter (m) | Area (m²) |
|---|
| 1 | 0.785 |
| 2 | 3.142 |
| 3 | 7.069 |
| 4 | 12.566 |
| 5 | 19.635 |
| 6 | 28.274 |
| 7 | 38.485 |
| 8 | 50.265 |
| 9 | 63.617 |
| 10 | 78.540 |
| 20 | 314.159 |
| 30 | 706.858 |
| 50 | 1963.495 |
Table 2: Area by Diameter (Imperial Units - feet)
| Diameter (ft) | Area (ft²) |
|---|
| 1 | 0.785 |
| 2 | 3.142 |
| 3 | 7.069 |
| 4 | 12.566 |
| 5 | 19.635 |
| 6 | 28.274 |
| 7 | 38.485 |
| 8 | 50.265 |
| 9 | 63.617 |
| 10 | 78.540 |
| 20 | 314.159 |
| 30 | 706.858 |
| 50 | 1963.495 |
Table 3: Diameter to Radius Conversion
| Diameter (d) | Radius (r) |
|---|
| 1 | 0.5 |
| 2 | 1 |
| 5 | 2.5 |
| 10 | 5 |
| 20 | 10 |
| 50 | 25 |
| 100 | 50 |
Table 4: Calculated Areas from Radius
| Radius (r) | Area (m² or ft²) |
|---|
| 0.5 | 0.785 |
| 1 | 3.142 |
| 2.5 | 19.635 |
| 5 | 78.540 |
| 10 | 314.159 |
| 25 | 1963.495 |
| 50 | 7853.981 |
Table 5: Diameter and Area for Common Objects
| Object | Diameter | Area |
|---|
| Standard dinner plate | 0.28 m | 0.0616 m² |
| Small round table | 0.76 m | 0.452 m² |
| Large dining table round | 1.5 m | 1.766 m² |
| Circular swimming pool (small) | 5 m | 19.635 m² |
| Circular tractor wheel | 3 ft | 7.07 ft² |