Heat Sink Size Calculator

Introduction: Heat sinks are crucial components in electronic devices, dissipating heat generated by various components. The Heat Sink Size Calculator assists in determining the appropriate heat sink size based on thermal power and thermal resistance.

Formula: The recommended heat sink size is calculated by multiplying the thermal power by the thermal resistance.

How to Use:

  1. Enter the thermal power (in watts) in the first input field.
  2. Enter the thermal resistance (in °C/W) in the second input field.
  3. Click the “Calculate” button to obtain the recommended heat sink size.

Example: Suppose the thermal power is 10 watts, and the thermal resistance is 2 °C/W. Enter “10” in the first input field and “2” in the second input field. Click “Calculate,” and the result will provide the recommended heat sink size, which might be approximately 20 cm².


  1. *Q: Can I use this calculator for all types of heat sinks?
    • A: The calculator provides a general guideline. Consult with manufacturers for specific recommendations based on their heat sink models.
  2. *Q: Does the calculator account for different materials of heat sinks?
    • A: The calculator focuses on thermal power and resistance. Consider material specifications separately for more accurate sizing.
  3. *Q: Can I use this calculator for passive and active cooling systems?
    • A: The calculator is suitable for both passive and active cooling. Adjust other parameters as needed for specific system requirements.
  4. *Q: What happens if I choose a heat sink size smaller than recommended?
    • A: An undersized heat sink may not effectively dissipate heat, leading to potential overheating. It’s advisable to follow the recommended size for optimal performance.
  5. *Q: How often should I use the calculator to determine my heat sink size?
    • A: Use the calculator when designing a new system or upgrading existing components. Changes in thermal requirements may also warrant recalculating.

Conclusion: The Heat Sink Size Calculator is a valuable tool for engineers and enthusiasts working with electronic components. Use it as a starting point and consider additional factors for a customized solution. Ensure your devices stay cool and perform optimally with the right-sized heat sink!

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