Have you tried using a **pcb trace width calculator** (which can be found online)?

See: [https://easyeda.com/forum/topic/PCB-high-current-thermal-design-562f7a69a7ad41a38b18ea150d6703ed](https://easyeda.com/forum/topic/PCB-high-current-thermal-design-562f7a69a7ad41a38b18ea150d6703ed)

Hi! I usually use this tool to calculate trace widths: [https://www.7pcb.com/trace-width-calculator.php](https://www.7pcb.com/trace-width-calculator.php) So good rule of thumb for 1oz copper: Power traces: 24mil - 32mil = 1A 32mil - 48mil = 2A - 3A 48mil or more = 3A or more for more amps then I recommend using more than 1oz copper. Signal traces: 12mil - 16mil Quite many electronics projects here don't use more than 1A current. Therefore, I recommend using 24mil - 32mil track width for your power traces. Regards, Markus Virtanen HW / Electronics Designer

Remember that in most online calculators, the calculation for trace dimensions vs. current is based on the allowable temperature rise in the trace. That temperature rise is something you have to decide upon. For high current traces, this is usually the limiting factor but for narrow traces it may be that the voltage drop and therefore the resistance of the track needs to be considered. Using Copper Areas for ground a nd supply can often avoid problems with trying to route wide tracks because, depending on the layout, they can either provide large and therefore low resistance areas of copper or several smaller paths that aggregate to effectively form a low resistance path. For high speed, RF and microwave designs then the trace widths may be dictated by the required characteristic impedance of the signal tracks. For that you need to use information and tools like: [https://cart.jlcpcb.com/impedance?_ga=2.192032042.1483863324.1601746493-139248169.1592496815](https://cart.jlcpcb.com/impedance?_ga=2.192032042.1483863324.1601746493-139248169.1592496815) [https://cart.jlcpcb.com/impedanceCalculation?_ga=2.192032042.1483863324.1601746493-139248169.1592496815](https://cart.jlcpcb.com/impedanceCalculation?_ga=2.192032042.1483863324.1601746493-139248169.1592496815) And for more advanced work: Rogers supply the very nice MWI-2020 tool (and their ring resonator tool is great for helping characterise the substrate material) for free: [https://rogerscorp.com/Tools](https://rogerscorp.com/Tools) and for other work a multi-layer dielectric field solver tool such as mdtlc: [http://mdtlc.sourceforge.net/](http://mdtlc.sourceforge.net/) and a Smith Chart Tool: [https://www.microwaves101.com/smith-chart/smith-chart-tool-v1](https://www.microwaves101.com/smith-chart/smith-chart-tool-v1) [https://www.will-kelsey.com/smith_chart/](https://www.will-kelsey.com/smith_chart/) and this free tool is priceless: [http://www.hp.woodshot.com/](http://www.hp.woodshot.com/) (IIRC, it runs OK on WINE.)