Circuit Design Tools

This is twelve small, single-purpose calculators grouped into one tool, each solving a specific circuit-design problem: Ohm's Law and power dissipation (solve for whichever of voltage, current, resistance, or power you don't already know), voltage dividers, RC and RLC time-constant/resonance calculations, series and parallel resistor equivalence, Delta-Wye (Y-Δ) three-phase network transforms, a current-limiting resistor sizer for LEDs, an IPC-2221-style PCB trace width estimator, transformer turns-ratio/voltage conversion, and power factor from either real/apparent power or a phase angle.

Each tool is independent — pick it from the row of buttons above the form, and only the fields that specific calculation needs are shown. Ohm's Law and Power Dissipation both accept any two of voltage/current/resistance and solve for the rest, the same way a physical Ohm's Law wheel works, rather than forcing you to rearrange the formula yourself.

PCB trace width uses the IPC-2221 approximation for external and internal copper layers, which is standard for a first-pass estimate but not a substitute for your PCB manufacturer's own current-carrying-capacity tables at higher currents or unusual board stack-ups.

1. Pick a tool from the row of buttons — each is a self-contained calculator with its own fields.
2. Enter the known values; the result updates as you type.
3. For Ohm's Law, Power Dissipation, and Delta-Wye, only the fields needed for that direction are required — leave the value you want solved for blank where applicable.