MOSFET Switching Loss Calculator
Enter the voltage, current, switching times and frequency to get the switching loss.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
A MOSFET doesn't switch on or off instantaneously — during the brief turn-on and turn-off transition times (t_on, t_off), it's simultaneously carrying significant current and dropping significant voltage, dissipating energy as heat. The switching power loss is approximated as P = 0.5 · Vds · Id · (t_on + t_off) · fsw, where Vds and Id are the blocking voltage and conducted current, and fsw is the switching frequency — meaning loss scales linearly with how fast you switch the device.
Power electronics engineers calculate this when designing switch-mode power supplies, motor drives, and DC-DC converters, since switching loss (together with conduction loss) determines how much heatsinking a MOSFET needs and sets a practical ceiling on how high the switching frequency can go before efficiency and thermal limits are exceeded.
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