PCB Tools & Calculators

Standards-based calculators that run entirely in your browser — no account required.

Signal Integrity

Trace Width Calculator

Calculate the minimum PCB trace width required to carry a given current without exceeding a temperature rise limit.

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Transmission Lines

Microstrip Impedance

Calculate the characteristic impedance of an external (microstrip) PCB transmission line.

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Power

Via Current Capacity

Estimate the current a plated through-hole via can safely carry based on its diameter and copper plating thickness.

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Passive Components

RC Time Constant

Calculate the time constant, cutoff frequency, and charge/discharge time for an RC circuit.

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LED Current-Limiting Resistor

Find the correct series resistor value to drive an LED at the desired current from a given supply voltage.

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Resistor Voltage Divider

Calculate output voltage, current draw, and power dissipation for a two-resistor voltage divider.

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