Engineering calculators, grounded in the standard.
Size traces, decode IP ratings, check creepage, convert wire gauges - every tool tied to the applicable standard, formula or primary source, with the working shown. Free, fast, no sign-up.
Three toolkits, one standard of rigor
Each area groups its calculators with the guides that explain the standard behind them.
PCB Design
Trace width, via current, resistance and impedance, with documented methods and assumptions.
Enclosure & Safety
IP/NEMA ratings, creepage & clearance, pollution degree and UL 94 - grounded in IEC, UL & NEMA.
Converters & References
AWG↔mm, mAh↔Wh and component-code decoders - with the reference tables behind them.
Start with a popular calculator
PCB Trace Width
IPC-2221Width for current & temperature rise.
IP / NEMA Decoder
IEC 60529Decode IP codes and NEMA enclosure types.
Creepage & Clearance
IEC 60664Estimate creepage and impulse-based clearance within stated limits.
AWG ↔ mm²
ASTM B258Wire gauge to area and diameter.
UL 94 Ratings
UL 94Compare V-0, V-1, V-2, HB & 5V.
mAh ↔ Wh
BatteryCapacity to energy at a voltage.
Recently updated
Read each page’s method, sources and limits alongside its result. Here are the most recent content updates.
Built like an instrument, not a guess
Every result shows its method and source
Each tool names the applicable standard, formula or primary source, so you can trace the result back to its basis.
Both methods where they differ
Compare a legacy trace-current equation with a published IPC-2152-based approximation.
Method, assumptions & limits
Every calculator shows the formula, inputs, assumptions and validity limits needed to review the result instead of treating it as a black box.