# PCB Trace Designer > Size a PCB trace: width for current and temperature (IPC-2221) and controlled impedance for microstrip/stripline, in a single tool. Practice: elettronica Status: Proto v0.1 Tag: PCB, IPC-2221, Impedenza, Microstrip, Signal integrity Method, assumptions and limits: Page: --- Two PCB trace design tools in one. Trace width: from current, temperature rise and copper thickness get the minimum width per IPC-2221, with resistance and voltage drop. Controlled impedance: from geometry and dielectric compute the Z0 of microstrip and stripline, or start from the target impedance (50, 90, 100 Ω) and get the width. This file is a **descriptor**, not the tool's documentation: it says what the tool computes and by what method, in summary. Formulas, assumptions, validity conditions and limits are in the wiki linked above. The tool runs in the browser at the page given.