2 mg of oxazepam equates to 1 mg of diazepam according to the benzodiazepine equivalency converter, therefore 20 mg of oxazepam according to BZD equivalency equates to 10 mg of diazepam and 15 mg oxazepam to 7.5 mg diazepam (rounded up to 8 mg of diazepam). Some BZD equivalency converters use 3 to 1 (oxazepam to diazepam), 1 to 3 (diazepam to oxazepam) as the ratio (3:1 and 1:3), so 15 mg of oxazepam would equate to 5 mg of diazepam.