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PCB Trace Width Calculator (IPC-2221) — Free Online Tool

Current vs trace width vs temp rise

PCB trace width per IPC-2221A: required width for current carrying capacity given temp rise + copper weight (1oz, 2oz). Internal vs external traces.

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PCB Trace Width Calculator (IPC-2221A)

Calculate minimum PCB trace width for given current + allowed temperature rise. Per IPC-2221A standard. External vs internal layers, copper weight 0.5/1/2/3 oz.

How to use this tool

  1. 1

    Current + temp rise

    Trace current and allowed Δt.

  2. 2

    Copper weight + layer

    1oz/2oz, internal vs external.

  3. 3

    Min trace width

    Per IPC-2221A formula.

Frequently Asked Questions

IPC-2221A formula?
I = k × ΔT^0.44 × A^0.725. External: k = 0.048; internal: k = 0.024. ΔT in °C, A in mil² (cross-section), I in amps. Solved for required area.
Why are internal traces worse?
No air convection — heat trapped. Same trace width carries ~half the current vs external. Internal layers always need ~2× wider for same current.
1oz vs 2oz copper?
1oz = 35 µm thick, 2oz = 70 µm. 2oz roughly halves required width (more cross-section). Cost: 2oz costs ~30% more, used for power-handling boards.

Key Takeaways

  • PCB Trace Width Calculator (IPC-2221) is a free, browser-based calculator tool — current vs trace width vs temp rise.
  • No signup, no downloads, no file uploads — your data stays on your device.
  • Works on desktop, tablet, and mobile. Install as a PWA for offline access.

How to Use PCB Trace Width Calculator (IPC-2221)

  1. Open the tool: Launch PCB Trace Width Calculator (IPC-2221) on Toololis — no account or download needed.
  2. Enter your data: Paste text, enter values, or select a file directly in your browser.
  3. Get instant results: Everything is processed locally — results appear immediately.
  4. Copy or download: Save your output or share it. Bookmark for quick access next time.

PCB Trace Width Calculator (IPC-2221) — Quick Facts

Price
Free — no limits, no watermarks, no paywalls
Privacy
100% browser-based — no data is sent to any server
Platform
Any modern browser on desktop, tablet, or mobile
Category
Calculator Tools on Toololis
Offline
Works offline after first visit (Progressive Web App)
FeatureDetails
ToolPCB Trace Width Calculator (IPC-2221)
CategoryCalculator
Signup RequiredNo
File UploadNone — processed in browser
Mobile SupportFully responsive
CostFree forever

Why Use PCB Trace Width Calculator (IPC-2221)?

You should try PCB Trace Width Calculator (IPC-2221) for a quick, private way to current vs trace width vs temp rise. All processing happens in your browser. Your files and data never leave your device. According to web.dev, client-side processing is the gold standard for privacy.

On the other hand, dedicated APIs or desktop tools suit batch processing better. They also handle server-side automation. For everyday tasks, browser tools offer the best speed, privacy, and convenience.

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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.