Zener Diode Calculator

Design zener diode voltage regulator circuits with proper component values.

Circuit Parameters

Nominal Input Voltage (V)

Min Input Voltage (V)

Max Input Voltage (V)

Zener Voltage (V)

Load Current (mA)

Zener Power Rating (mW)

69.7

Calculated (ohms)

Standard (ohms)

0.68W

Power Dissipation

1.5W

Recommended Rating

Valid Design

Voltage Across Resistor6.90 V

Total Current99.02 mA

Nominal Zener Current49.02 mA

Iz at Min Vin20.32 mA

Iz at Max Vin92.07 mA

Min Iz Required9.80 mA

Max Iz Allowed98.04 mA

Zener Power (Max Vin)469.6 mW

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MyCalcBuddy Editorial Team

This page is maintained as an educational calculator reference.

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Formula Source: Standard Mathematical References

by Various

ðŸ”„Last reviewed: May 2026

âœ“Formula checks are based on standard references and internal QA review.