PCB Design Calculators
Free and no sign-up needed — handy for quick checks. When you're working on a full board, Flux can handle these calculations for you inside the editor.
Voltage Divider Calculator
Work in either direction: get the output voltage from a resistor pair, or start from a target voltage and get the resistor values plus the nearest standard E-series parts, along with current and power dissipation.
Open CalculatorResistor Color Code Calculator
Decode 4-band, 5-band and 6-band resistors by setting each color band, and get the resistance, tolerance and temperature coefficient — or go the other way and turn a resistance value into its color code.
Open CalculatorPCB Trace Width Calculator
Size copper for current with IPC-2221: pick an external or internal conductor, enter the current, allowed temperature rise and copper thickness, and get the minimum trace width plus cross-section, resistance, voltage drop and power loss.
Open Calculator
