Dosage

dose ordered dose available volume available volume to give

Formula:

dose ordered dose available

x volume available

Examples

Give 100 mg of theophylline elixir. The elixir comes as 27 mg per 5 mL. Using the calculator, a dosage of 18.5 mL is prepared. In this example,

100 mg = dose ordered

27 mg = dose available

5 mL = volume available

100mg 27mg

x 5mL

Which = 18.52 mL

So the volume to give = 18.5 mL

See the example below.

Another example, give 650 mg of liquid acetaminophen (Tylenol^®). The liquid acetaminophen comes in a concentration of 120 mg per 5 mL. How much medication would you give? Answer: 27 mL.

650 mg = dose ordered


120 mg = dose available

5 mL = volume available

650mg 120mg

x 5mL

which = 27.08 mL

So the volume to give = 27 mL

Note

It doesn't matter what type of units are used in this calculator. You can figure out how many grams to give or how many milligrams to give, micrograms, units, grains, etc. Remember to be consistent (i.e. don't mix milligrams with grams).

---

Return to:

"The information provided on this page is property of, and provided courtesy of, ManuelsWeb.com."

www.manuelsweb.com

nursing calculators

Dosage

The following is a list of nursing calculators. Each calculator, along with examples and formulas, provides a unique way to review nursing math.

How to use the calculators

Each link below, describing the calculator, will take you to that calculator's web page. To work these calculators, everything above the "solve" button is for you to fill in. The answer(s) will be shown below the "solve" button. Friendly alerts will appear if you leave a box blank or type in something wrong. You may see examples of the calculator on those pages (examples shown are just for display).

This calculator does not work. It is just for display.	These radio buttons let you choose between options. Click and point with your mouse to select or change an option. The dot indicates which option is selected.
	All the boxes above the "solve" button are for you to fill in. These boxes require numbers or decimal points (periods) only.
	The "solve" button takes whatever information is entered and calculates the result.
	All boxes below the "solve" button are where the results are displayed. Don't put anything here.
	The "reset" button clears all information entered. The radio buttons will go back to their default option.

Dosage calculators:

1. PO dosage calculator calculates liquid medications such as acetaminophen elixir
2. IV dosage calculator calculates IV medications such as furosemide and digoxin
3. PO dosage calculator - solids i.e. tablets, caplets, capsules, lozenges

Calculate IV rates:

1. IV rate (gtt/min) calculates IV rates without using an IV pump
2. IV rate (mL/hr) calculates IV rates when given a time limit when IV must be infused
3. mcg/min as mL/hr calculates IV medication rates such as norepinephrine and nitroglycerine
4. mcg/kg/min as mL/hr calculates IV medication rates such as nitroprusside and dopamine

Calculate infusion time:

1. IV time (hrs) given an IV rate, calculates the duration of an IV

Calculate dosage given or infusing:

There are times when the only way to figure out how much medication is being infused is by looking at the information on the IV bag and the rate of the infusion.

1. mL/hr as dose/hr calculates the dose of medications infusing such as heparin
2. mL/hr as mcg/min calculates the dose of medications infusing such as nitroglycerine and norepinephrine
3. mL/hr as mcg/kg/min calculates the dose of medications infusing such as dobutamine and nitroprusside

Clinical Calculators

1. pediatric dose calculator converts an adult dosage into a pediatric using BSA
2. O2 remaining in e-cylinder calculates how much O2 is left according to rate infusing
3. bsa calculator calculates the BSA according to height and weight
4. drug absorption (Pka) determines how well a medication will be absorbed into the body
5. O.R. fluid requirements calculates IV rate according to the type of surgery
6. N.P.O. fluid replacement calculates fluid replacement for time NPO
7. allowable blood loss calculates how much blood can be lost without needing a transfusion
8. estimated blood volume estimates how much blood is in a person's body
9. Ideal Body Weight (IBW) compares an individuals weight against a statistical norm
10. Adjusted Body Weight (ABW) calculates the ABW in obese persons for more accurate drug dosing

Conversion Calculators

1. °F,°C conversions converts Fahrenheit and Celsius temperatures
2. pounds to kilograms converts pound and kilogram weights
3. inches to centimeters converts inch and centimeter lengths
4. % solutions to mg/mL converts % solution into mg/mL concentration
5. epinephrine solutions to mg/mL chart that converts a ratio into a mg/mL concentration

---

Return to

"The information provided on this page is property of, and provided courtesy of, ManuelsWeb.com."

www.manuelsweb.comThese radio buttons let you choose between options. Click and point with your mouse to select or change an option. The dot indicates which option is selected.

All the boxes above the "solve" button are for you to fill in. These boxes require numbers or decimal points (periods) only.

The "solve" button takes whatever information is entered and calculates the result.

All boxes below the "solve" button are where the results are displayed. Don't put anything here.

The "reset" button clears all information entered. The radio buttons will go back to their default option.



Dosage calculators:

1. PO dosage calculator calculates liquid medications such as acetaminophen elixir
2. IV dosage calculator calculates IV medications such as furosemide and digoxin
3. PO dosage calculator - solids i.e. tablets, caplets, capsules, lozenges

Calculate IV rates:

1. IV rate (gtt/min) calculates IV rates without using an IV pump
2. IV rate (mL/hr) calculates IV rates when given a time limit when IV must be infused
3. mcg/min as mL/hr calculates IV medication rates such as norepinephrine and nitroglycerine
4. mcg/kg/min as mL/hr calculates IV medication rates such as nitroprusside and dopamine

Calculate infusion time:

1. IV time (hrs) given an IV rate, calculates the duration of an IV



Calculate dosage given or infusing:

There are times when the only way to figure out how much medication is being infused is by looking at the information on the IV bag and the rate of the infusion.

1. mL/hr as dose/hr calculates the dose of medications infusing such as heparin
2. mL/hr as mcg/min calculates the dose of medications infusing such as nitroglycerine and norepinephrine
3. mL/hr as mcg/kg/min calculates the dose of medications infusing such as dobutamine and nitroprusside

Clinical Calculators

1. pediatric dose calculator converts an adult dosage into a pediatric using BSA
2. O2 remaining in e-cylinder calculates how much O2 is left according to rate infusing
3. bsa calculator calculates the BSA according to height and weight
4. drug absorption (Pka) determines how well a medication will be absorbed into the body
5. O.R. fluid requirements calculates IV rate according to the type of surgery
6. N.P.O. fluid replacement calculates fluid replacement for time NPO
7. allowable blood loss calculates how much blood can be lost without needing a transfusion
8. estimated blood volume estimates how much blood is in a person's body
9. Ideal Body Weight (IBW) compares an individuals weight against a statistical norm
10. Adjusted Body Weight (ABW) calculates the ABW in obese persons for more accurate drug dosing

Conversion Calculators

1. °F,°C conversions converts Fahrenheit and Celsius temperatures
2. pounds to kilograms converts pound and kilogram weights
3. inches to centimeters converts inch and centimeter lengths
4. % solutions to mg/mL converts % solution into mg/mL concentration
5. epinephrine solutions to mg/mL chart that converts a ratio into a mg/mL concentration

Return to

"The information provided on this page is property of, and provided courtesy of, ManuelsWeb.com."

www.manuelsweb.com