Enter a Copper Weight (in oz/ft²) and choose your Conversion Direction to get the corresponding Thickness in mils, microns, or millimeters — or flip it around and enter a known Thickness to find the equivalent Copper Weight.
Thickness
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Thickness
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Thickness
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Copper Weight
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The standard formula is: Thickness (mils) = Weight (oz/ft²) × 1.37. This means 1 oz/ft² of copper equals 1.37 mils thickness, or 0.00137 inches.
Copper thickness affects current carrying capacity and trace impedance. Thicker copper can handle more current but may affect impedance calculations in high-speed digital and RF circuits.
The most common copper weights are 0.5 oz (0.7 mils), 1 oz (1.4 mils), and 2 oz (2.8 mils). Heavy copper applications may use 3 oz or higher.
To convert mils to micrometers (μm), multiply by 25.4. For example, 1.4 mils equals 35.6 μm. This conversion is useful for international specifications.
Copper weight (oz/ft²) measures mass per unit area, while thickness (mils/μm) measures physical dimension. Both describe the same copper layer but in different units.
Yes, trace current capacity depends on copper thickness and trace width. Thicker copper allows higher current density, typically following IPC-2221 standards for temperature rise calculations.