Free tool
Calculate an infusion rate in mL/hr, a gravity drip rate in drops per minute, or how long a bag will take to run - with the formula and the working shown for each.
Built for PTCE and nursing dosage-calculation prepEnter the volume and time to see the rate.
IV rate questions reward practice until the setup is automatic - Encodr keeps formulas like these on a spaced-repetition schedule so they stick.
Get started freeFlow rate: mL/hr = total volume (mL) ÷ time (hr). Convert any
minutes to hours first (30 minutes = 0.5 hr).
Drip rate: gtt/min = (volume (mL) × drop factor (gtt/mL)) ÷ time (min).
The drop factor comes from the tubing. You can't count part of a drop, so the answer is rounded to
a whole number of drops. With 60 gtt/mL microdrip tubing, gtt/min equals mL/hr.
Infusion time: time (hr) = total volume (mL) ÷ rate (mL/hr).
Worked examples: 1,000 mL over 8 hours is 1,000 ÷ 8 = 125 mL/hr. The same bag on 15 gtt/mL tubing is (1,000 × 15) ÷ 480 min = 31.25, so 31 gtt/min. 500 mL at 100 mL/hr takes 500 ÷ 100 = 5 hours. This is a study tool - always follow the order and your facility's protocol for a real patient. More prep: the PTCB exam deck and the exam pass score calculator.
The IV flow rate (mL/hr), drip rate (gtt/min) and infusion time formulas, with worked examples, drop factors and a dose-based rate problem.
The calculation types behind the PTCE outline (conversions, doses, days supply, percent strength, dilutions, alligation, IV rates) with worked examples.
Who can take the PTCE for CPhT certification, what PTCB requires for education or experience, and how recertification every two years works.
Add eye, verbal and motor responses into a Glasgow Coma Scale total. A study aid for EMS students, not for patient care.
Open tool →Tick burned body regions for an adult or a child and get the estimated percent of total body surface area, as an NREMT study aid.
Open tool →Mean arterial pressure and pulse pressure from a blood pressure reading, with the 60 and 70 to 100 mm Hg benchmarks, as an NCLEX study aid.
Open tool →Pick the finding for each of the five Apgar signs and get the 0 to 10 total, with the repeat-at-10-minutes and escalation rules from the NCLEX course.
Open tool →Estimated date of delivery from the first day of the last menstrual period by Naegele's rule, with each step shown and optional gestational age.
Open tool →Add the six Braden subscale scores into the 6 to 23 total and see the pressure injury risk band: mild, moderate, high or severe.
Open tool →