Dose Calculator - Left handed 3.0
the author of this app says:
Dose Calculator lets you calculate doses from several inputs, including weight (Kg, lb or oz), dose (mg, kg, days), doses per day, and solution concentrations (mg, ml).
The calculated doses can be in mg, mL and tsp, and Dose Calculator will fine-tune a rounded-off dose.
In the right-handed version, features are available as dropdown lists, and there is no limit to rounding of doses.