Calculate mL per hour from total volume and time, or find the volume delivered or time required at a set rate, with an optional IV drip rate in gtt/min.
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mL Per Hour Formula
The following formula is used to calculate the rate in milliliters per hour.
Variables:
- Volume is the total volume of fluid in milliliters (mL)
- Time is the duration over which the volume is administered in hours (hr)
- Rate is the flow rate in milliliters per hour (mL/hr)
To calculate the rate in milliliters per hour, divide the total volume of fluid by the time in hours.
What is mL Per Hour?
Milliliters per hour (mL/hr) is a measure of flow rate commonly used in medical dosing and various chemical processes. It indicates the volume of fluid that passes through a given point or is administered over the course of an hour. Infusion administration still requires an independently verified order, concentration, device setting and facility procedure; flow arithmetic alone does not establish safety.
How to Calculate mL Per Hour?
The following steps outline how to calculate the rate in milliliters per hour.
- First, determine the total volume of fluid (Volume) in milliliters (mL).
- Next, determine the duration over which the volume is administered (Time) in hours (hr).
- Use the formula from above: Rate (mL/hr) = Volume (mL) / Time (hr).
- Finally, calculate the rate in milliliters per hour (mL/hr).
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
total volume of fluid (Volume) = 500 milliliters
duration over which the volume is administered (Time) = 5 hours. The calculated constant rate is 500 mL ÷ 5 hr = 100 mL/hr.
