To convert ounces to carats multiply by 141.7476. I've generated some hopefully helpful examples randomly below, as with most random sentences please excuse the repetitive and occasionally comic outcomes.
In 670 ounces of rice there are 94970.89 carats, to achieve this take 670 and just multiply by 141.7476.
To convert 790 ounces into carats multiply by 141.7476 giving 111980.6 carats.
You've got 340 ounces of salt but someone only wants to buy that in units of carats, to change the units multiply by 141.7476. Now you have 48194.18 carats.