Resistor Divider Calculator

Resistive Voltage Divider Calculator
This calculator helps you design a two-resistor voltage divider (R1 upper, R2 lower). The divider sets the output voltage according to the formula: V_out = V_in × R2 / (R1 + R2). Work modes: 1) known Vin & Vout (auto select standard resistors), 2) manual resistor entry, 3) known division ratio.

Input Voltage (Vin)

Output Voltage

Load Resistance (optional)

kΩ

Resistor Series / Tolerance

PPM for R1 (upper)

PPM

PPM for R2 (lower)

PPM

Resistor Range

kΩ

Resistor Specifications & Package Info

SMD Packages:

                0201: 50mW/15V (max. 50V)

                0402: 62.5mW/50V (max. 100V)

                0603: 100mW/50V (max. 100V)

                0805: 125mW/150V (max. 200V)

                1206: 250mW/200V (max. 400V)

                1210: 500mW/200V (max. 400V)

                2010: 750mW/200V (max. 400V)

                2512: 1W/200V (max. 400V)

Through-hole Packages:

                1/4W: 250mW/500V (Axial Ø2.3×6mm)

                1/2W: 500mW/500V (Axial Ø3.2×9mm)

                1W: 1W/500V (Axial Ø3.6×10mm)

                2W: 2W/500V (Axial Ø5×12mm)

                5W: 5W/500V (Axial Ø7×16mm)

⚡ Safety Factor: Calculator recommends 2.5x power margin for reliability

*Working voltage/Maximum voltage ratings based on industry standards

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