Convert a verified medication rate in mg/hr to pump rate in mL/hr using concentration in mg/mL, or solve for medication rate and solution concentration.

Required: ordered rate in mg/hr and a verified concentration in mg/mL.
Calculation aid only. Do not use this tool to choose a dose. Before administration, verify the patient, order, medication, units, final concentration, pump channel and settings, dose limits, and required independent check under your facility policy.
Use the final concentration on the pharmacy label, MAR, or approved standard-concentration record.
Enter the labeled final volume, including any required overfill convention from your approved process.
Do not round a pump setting unless the device increment and facility policy specify how.
This tool performs dimensional conversion only. It does not evaluate patient-specific appropriateness, compatibility, stability, maximum concentration, dose limits, or monitoring requirements.

Related Calculators

Mg/Hr to Ml/Hr Conversion Formula

The following formula is used to convert a dosage from mg/hr to ml/hr.

Flow rate (ml / hr) = Dosage (mg / hr) / Concentration (mg / ml)

Variables:

  • Dosage is the prescribed amount of medication in milligrams per hour (mg/hr)
  • Concentration is the concentration of the medication in milligrams per milliliter (mg/ml)

To convert a dosage from mg/hr to ml/hr, divide the dosage by the concentration.

mg/hr to mL/hr Conversion Table (Assumes concentration = 1 mg/mL)
Dose rate (mg/hr) Volume rate (mL/hr)
0.50.500
11.000
22.000
33.000
55.000
7.57.500
1010.000
12.512.500
1515.000
2020.000
2525.000
3030.000
4040.000
5050.000
6060.000
7575.000
100100.000
150150.000
200200.000
250250.000
* Rounded to 3 decimals. Assumes concentration = 1 mg/mL. Formula: mL/hr = (mg/hr) ÷ (mg/mL). Note: 1 mL/hr = 0.001 L/hr.

What is Dosage Conversion?

Dosage conversion is the process of converting the amount of medication prescribed in milligrams per hour to the volume that should be administered in milliliters per hour. This is a common calculation in the medical field, especially for nurses and pharmacists who prepare and administer intravenous medications. The conversion is necessary to ensure that patients receive the correct amount of medication according to the prescribed dosage and concentration.

How to Calculate Dosage Conversion?

The following steps outline how to calculate the dosage conversion from mg/hr to ml/hr.

  1. First, determine the prescribed dosage in milligrams per hour (mg/hr).
  2. Next, determine the concentration of the medication in milligrams per milliliter (mg/ml).
  3. Use the formula from above to calculate the flow rate in milliliters per hour (ml/hr).
  4. Finally, enter the values into the calculator to verify the result.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Prescribed dosage (mg/hr) = 50 mg/hr

Medication concentration (mg/ml) = 2 mg/ml