Dosage Calc
Questions and
Answers Updated
2026
determiningBgtt/minB-dropBfactorB-BAnswer
BconvertBgivenBhoursBtoBminutes=B1hr/60min=xhrs/xmin
volume(mL)/minutesBxBdropBfactor(gtt/min)=BxBgtt/min
1.5BLBtoBinfuseBoverB16Bhours.BDropBfactorBisB20Bgtt/min.BShouldBbeBsetBtoBdeliverB
howBmanyBgtt/min?BRoundBtoBnearestBwholeBnumberB-BAnswer
B1500mL/B360Bmin.BxB20Bgtt/min=B83
OneBgrainBisBequalBtoB-BAnswer
B60Bmilligrams,BthereforeBaBgrainBisBaBmoreBpowerfulBdoseBthanBaBmilligram
1BgramB(Gm)B=B?BmgB-BAnswer B1000mg
1BmilligramB(mg)B=?BmcgB-BAnswer B1000mcg
1BliterB(L)B=B?BmlB-BAnswer B1000ml
1BgrainB(gr)B=B?mg.Bgr1/4=?mg.Bgriii=?mgB-BAnswer B60mg.B15mg.B180mg.
1BteaspoonB(tsp)B=B?mlB-BAnswer B5ml
, 1BtablespoonB(Tbsp.)B=B?mlB-BAnswer B15ml
1BounceB(oz.)B=B?mlB-BAnswer B30Bml
1BkgB=B?lbsB-BAnswer B2.2lbs
TheBbasicBformulaBforBdosageBcalculationsBis:B-BAnswer
BD/HB×BVB=BamountBtoBgive.BAllBmustBbeBinBsameBunitBsystem.
DB(desiredBdose):BtheBdoseBordered
HB(on-handBdose;BsuppliedBdose):BdoseBonBlabelBofBcontainer
VB(vehicle):BformBandBamountBofBsuppliedBdrug.
OrderedBdose:BErythromycinB500mgBbyBmouthBeveryB8Bhours
SuppliedBdose:BErythromycinB250mg
Vehicle:B1BtabletB-BAnswer B250B×B1B=B2Btablets
Ratio-ProportionBFormulaB-BAnswer
BDoseBonBhand/QuantityBonBhandB=DoseBdesiredB/XB(quantityBdesired).BCrossBmultipl
yBandBsolveBforBx.BAllBmustBbeBinBsameBunitBsystemB.BCalculatingBforBtheBquantityB
ofBsuppliedBmedicationBthatBisBequalBtoBtheBprescribedBdosage
DoseBonBhandB(suppliedBdose):BErythromycinB250Bmg
QuantityBonBhand:B1Btablet
DesiredBdoseB(orderedBdose):BErythromycinB500BmgB-BAnswer
B250Bmg/1BtabletB=B500Bmg/XBtablet.BByBcrossBmultiplyingBandBsolvingBforBX,ByouBh
ave
250XB=B500
XB=B2Btablets
Questions and
Answers Updated
2026
determiningBgtt/minB-dropBfactorB-BAnswer
BconvertBgivenBhoursBtoBminutes=B1hr/60min=xhrs/xmin
volume(mL)/minutesBxBdropBfactor(gtt/min)=BxBgtt/min
1.5BLBtoBinfuseBoverB16Bhours.BDropBfactorBisB20Bgtt/min.BShouldBbeBsetBtoBdeliverB
howBmanyBgtt/min?BRoundBtoBnearestBwholeBnumberB-BAnswer
B1500mL/B360Bmin.BxB20Bgtt/min=B83
OneBgrainBisBequalBtoB-BAnswer
B60Bmilligrams,BthereforeBaBgrainBisBaBmoreBpowerfulBdoseBthanBaBmilligram
1BgramB(Gm)B=B?BmgB-BAnswer B1000mg
1BmilligramB(mg)B=?BmcgB-BAnswer B1000mcg
1BliterB(L)B=B?BmlB-BAnswer B1000ml
1BgrainB(gr)B=B?mg.Bgr1/4=?mg.Bgriii=?mgB-BAnswer B60mg.B15mg.B180mg.
1BteaspoonB(tsp)B=B?mlB-BAnswer B5ml
, 1BtablespoonB(Tbsp.)B=B?mlB-BAnswer B15ml
1BounceB(oz.)B=B?mlB-BAnswer B30Bml
1BkgB=B?lbsB-BAnswer B2.2lbs
TheBbasicBformulaBforBdosageBcalculationsBis:B-BAnswer
BD/HB×BVB=BamountBtoBgive.BAllBmustBbeBinBsameBunitBsystem.
DB(desiredBdose):BtheBdoseBordered
HB(on-handBdose;BsuppliedBdose):BdoseBonBlabelBofBcontainer
VB(vehicle):BformBandBamountBofBsuppliedBdrug.
OrderedBdose:BErythromycinB500mgBbyBmouthBeveryB8Bhours
SuppliedBdose:BErythromycinB250mg
Vehicle:B1BtabletB-BAnswer B250B×B1B=B2Btablets
Ratio-ProportionBFormulaB-BAnswer
BDoseBonBhand/QuantityBonBhandB=DoseBdesiredB/XB(quantityBdesired).BCrossBmultipl
yBandBsolveBforBx.BAllBmustBbeBinBsameBunitBsystemB.BCalculatingBforBtheBquantityB
ofBsuppliedBmedicationBthatBisBequalBtoBtheBprescribedBdosage
DoseBonBhandB(suppliedBdose):BErythromycinB250Bmg
QuantityBonBhand:B1Btablet
DesiredBdoseB(orderedBdose):BErythromycinB500BmgB-BAnswer
B250Bmg/1BtabletB=B500Bmg/XBtablet.BByBcrossBmultiplyingBandBsolvingBforBX,ByouBh
ave
250XB=B500
XB=B2Btablets