This calculator allows you to convert from Velocity of light in vacuum to Velocity of sound in sea water (20°C, 10 meter deep) and in a reverse direction. To convert from Velocity of light in vacuum to Velocity of sound in sea water (20°C, 10 meter deep), enter the amount of Velocity of light in vacuum into the first input and to convert from Velocity of sound in sea water (20°C, 10 meter deep) to Velocity of light in vacuum, enter the amount of Velocity of sound in sea water (20°C, 10 meter deep) into the second input.