# How to calculate the efficiency of MOSFETS?

**URL:** <https://forum.plexim.com/t/how-to-calculate-the-efficiency-of-mosfets/1352>\
**Category:** PLECS\
**Tags:** 3phase-vsi-sic-mosfet\
**Created:** [April 24, 2024, 4:41am UTC](https://forum.plexim.com/t/how-to-calculate-the-efficiency-of-mosfets/1352 "2024-04-24T04:41:18Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Karthik\_Nandi\_Gopala](https://avatars.discourse-cdn.com/v4/letter/k/ba8739/32.png) [@Karthik\_Nandi\_Gopala](https://forum.plexim.com/u/Karthik_Nandi_Gopala)\
**Post date:** [April 24, 2024, 4:41am UTC](https://forum.plexim.com/t/how-to-calculate-the-efficiency-of-mosfets/1352/1 "2024-04-24T04:41:18Z")

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I am calculating the efficiency of the MOSFETS using a switch loss calculator probe. It calculates using the switching losses from the MOSFET and input source ( 1-Ploss/Pin). The value that I am getting is too high at 99.84 and above, do I consider this efficiency to be accurate and consider the values? As I am using the efficiency of the mosfets to validate my switching losses.

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**Author:** ![Kris\_Eberle](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/kris_eberle/32/6_2.png) [@Kris\_Eberle](https://forum.plexim.com/u/Kris_Eberle)\
**Post date:** [April 24, 2024, 12:13pm UTC](https://forum.plexim.com/t/how-to-calculate-the-efficiency-of-mosfets/1352/2 "2024-04-24T12:13:13Z")

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We are happy to give some feedback, but this is far too little information for anyone to help. Can you include your model and thermal description files here?