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IV Volume, Time & Rate Basics
Understand volume, time and rate as three connected values within one constant-rate interval before choosing a calculation.
MedMaths Learn pathway
IV Calculations
Learn rates, durations, drops, pump calculations and infusion relationships in a clear step-by-step progression.
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IV Volume, Time & Rate Basics
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Topic pathway
Work through IV Calculations
Follow the order below for a structured pathway, or open any lesson when you need that skill.
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IV Pump Rate (mL/hr)
Calculate mL/hr from a verified volume and time, including times stated in minutes.
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Infusion Time
Calculate duration from remaining volume and mL/hr, then interpret decimal hours safely.
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Drops per Minute (gtt/min)
Use the giving-set drop factor, volume and time in minutes to calculate a gravity drip rate.
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Calculated Medication Amount Over Time
Use concentration and a stated or calculated infused volume to calculate a medication amount for one verified infusion interval.
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Medication Rate (mg/hr & mg/min)
Calculate the medication dose rate represented by a verified concentration and matching current mL/hr, then convert mg/hr ↔ mg/min without mixing units.
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mcg/kg/min to mL/hr Infusion Rates
Move between an authorised mcg/kg/min dose rate and mL/hr using the verified dosing weight and current concentration, then reverse-check the represented dose rate.
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IV Medication Rate Change Calculations
Separate before and after intervals, verify the already-authorised new target and current preparation, then recalculate the represented medication rate, amount and pump mL/hr without choosing the titration step.
Practice
Build difficulty when the lesson makes sense
Foundation, Beginner, Intermediate and Advanced are quiz levels for each lesson, separate from the teaching lesson itself.
LEVEL 01
Foundation
Understand the question
LEVEL 02
Beginner
Calculate it
LEVEL 03
Intermediate
Interpret it
LEVEL 04
Advanced
Reason through it
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