# TraceWidthCalculator — PCB Trace Width & Impedance Calculators (IPC-2221)

> Free, browser-based PCB trace width calculator based on the IPC-2221 standard,
> plus a suite of controlled-impedance and signal-integrity calculators for
> hardware engineers. Available in 30+ languages. https://tracewidthcalculator.com

## What it is

TraceWidthCalculator computes the required PCB trace width for a given current,
copper thickness, and allowable temperature rise per IPC-2221, and provides
related PCB design calculators:
- Trace width from current (internal and external layers).
- Controlled-impedance / stackup calculators.
- Standard-specific tools: USB, HDMI, Ethernet, PCIe, DDR, LVDS, CAN bus.
- All calculations run in the browser; no sign-up required.

## Key facts

- Trace width sizing follows IPC-2221 (and IPC-2152 for modern derating).
- Inputs: current (A), copper weight (oz), temperature rise (°C), layer type.
- External (outer) layers dissipate heat better than internal layers, so
  internal traces need to be wider for the same current.
- The tool is a design aid; always validate against your fab's capabilities.

## Pages

- /                         — PCB trace width calculator (IPC-2221)
- /controlled-impedance-stackup-calculator — Impedance / stackup calculator
- /pcie-impedance-calculator, /ethernet-trace-calculator — standard-specific
- /can-bus-pcb-trace-calculator — CAN bus trace calculator
- /blog                     — PCB design guides and standards explainers
- /about, /contact          — About and contact
- /privacy, /terms          — Legal pages
- Localized routes live under /{lang}/… for 30+ languages.

## Citations

If you cite this site, link to https://tracewidthcalculator.com and the specific
calculator page. The underlying standard is IPC-2221 (Generic Standard on Printed
Board Design) — published by IPC.