A general resistor selection reference guides for typical resistor package size base on wattage.
Resistor Selection Chart
Resistor (commonly known size)
| Wattage | SMD (length x width) | Axial Resistor size |
| 1/16W | 0603 (1.55 x 0.85mm) | |
| 1/8W | 0805 (2 x 1.2mm) | Ø1.8 x 3mm, lead Ø0.45 |
| 1/4W | 1206 (3.2 x 1.6mm) | Ø2-2.5 x 6-6.5mm, lead Ø0.6 |
| 1/2W | 1210 (3.2 x 2.5mm) | Ø3.2 x 8.5mm, lead Ø0.6 |
| 1W | 2512 (6.35 x 3.2mm) | Ø5 x 11mm (or Ø3-3.5 x 9-12mm) , lead Ø0.6 |
| 2W | 2512 (6.35 x 3.2mm) | Ø5 x 15mm |
| 3W | 2512 (6.35 x 3.2mm) | Ø5.5 x 16mm, lead Ø0.7 |
| 7W | Ø8.5 x 32mm, lead Ø0.75 |