On-site Hardware Calculators: Trace Width, Via Current, Power Budget
Three browser-only calculators: every formula and constant is printed on the page, what you type stays in your browser and never reaches a server. The worked examples come from the same Python reference implementation the page recalculates against.
PCB Trace Width and Current Calculator
Give it the current, allowed temperature rise, copper weight and layer, and it inverts the common IPC-2221 chart fit for the minimum trace width, then adds the resistance, voltage drop and heating of that run. Calculated in the browser; nothing is uploaded.
Open the calculator →Via Current and Barrel Resistance Calculator
Works out the plated barrel cross-section from drill diameter and plating thickness, then uses the same IPC-2221 fit to estimate how much current one via carries, together with barrel resistance, drop and dissipation. Calculated in the browser; nothing is uploaded.
Open the calculator →Board Power Budget and Battery Runtime Calculator
List each load with voltage, current and supply path (direct / LDO / DC-DC) to get total input power and current, a margin-inclusive supply rating, and battery runtime converted through energy. Calculated in the browser; nothing is uploaded.
Open the calculator →How this set of pages works
Related on this site
Online Tools
No-install browser entry points for flashing, debugging and pinout lookup
Open the tool list →AI board selector
Hand the specification you just worked out to the selection assistant; it only recommends boards and projects indexed on this site.
Ask the assistant →Component sourcing and alternate-part cross-reference
Once the numbers are worked out you still need parts: BOM sourcing and cross-references can be handled here
Read the service note →Data and formulas last checked：2026-11-02 · 3 calculators, 9 worked examples, 17 Q&A entries indexed