https://www.uscis.gov/i-539
Filing Fee
$370.
You and each co-applicant must also pay an $85 biometric services fee.
Exceptions:
Individuals changing into or out of A-1, A-2, A-3, G-1, G-2, G-3, G-4, G-5, NATO-1, NATO-2, NATO-3, NATO-4, NATO-5, or NATO-6 status are not required to submit either the filing fee or the biometric services fee.
Individuals changing into or extending H-4, L-2, E-1, E-2, E-2C, E-3, or E-3D nonimmigrant status are not required to submit the biometric services fee, effective May 17, 2021 – May 17, 2023.