Calculate medication dosages with three professional modes: liquid medication dosing, weight-based dosage, and IV drip rate. Trusted by healthcare professionals.
A patient is prescribed 500 mg of amoxicillin oral suspension. The medication is available as 250 mg per 5 mL.
Concentration: 250 mg ÷ 5 mL = 50 mg/mL
mL to Administer: 500 mg ÷ 50 mg/mL = 10 mL
Give 10 mL (2 teaspoonfuls) of the 250 mg/5 mL suspension per dose.
A child weighing 22 kg (48.5 lbs) needs ibuprofen at 10 mg/kg/dose, to be given every 6–8 hours (max 3 times daily).
Dose per administration: 22 kg × 10 mg/kg = 220 mg
Maximum daily dose: 220 mg × 3 = 660 mg/day
Using children's ibuprofen (100 mg/5 mL), give 11 mL per dose.
A patient needs 1000 mL of normal saline over 8 hours. The IV set has a drop factor of 20 gtt/mL.
Convert hours to minutes: 8 × 60 = 480 minutes
Drip rate: (1000 mL × 20 gtt/mL) ÷ 480 min = 42 gtt/min
Set the IV to deliver approximately 42 drops per minute.
A patient needs 50 mL of antibiotic solution infused over 1 hour using a microdrip set (60 gtt/mL).
Convert hours to minutes: 1 × 60 = 60 minutes
Drip rate: (50 mL × 60 gtt/mL) ÷ 60 min = 50 gtt/min
Using a microdrip (60 gtt/mL), set the rate to 50 drops per minute.
Accurate dosage calculation is critical in healthcare. This calculator supports the three most common clinical scenarios: liquid medication dosing, weight-based dosing, and IV drip rate calculation.
| Drop Factor | Type | Common Uses |
|---|---|---|
| 10 gtt/mL | Macrodrip | Blood transfusions, rapid infusions |
| 15 gtt/mL | Macrodrip | Standard adult IV sets |
| 20 gtt/mL | Macrodrip | Commonly used in many clinical settings |
| 60 gtt/mL | Microdrip | Pediatric infusions, precise medication delivery |
Always verify dosage calculations using a second method or have a colleague confirm. Medication errors can have serious consequences.
Use the patient's most recent weight in kilograms. Never estimate weight when calculating critical medications like chemotherapy or anesthetics.
Always confirm the drop factor (gtt/mL) of your IV administration set before starting an infusion. Check the packaging — it varies by manufacturer.
Always verify the medication concentration on the vial or bottle. Different formulations (e.g., 250 mg/5 mL vs. 125 mg/5 mL) can lead to tenfold errors.
A Dosage Calculator is a clinical tool used by healthcare professionals, nurses, pharmacists, and patients to determine the correct amount of medication to administer. Accurate dosage calculation is a fundamental skill in medicine — errors can lead to underdosing (ineffective treatment) or overdosing (toxicity).
Our calculator supports the three most common clinical scenarios: liquid medication dosing (determining how many mL to give based on the prescribed mg dose and the medication's concentration), weight-based dosage (calculating the dose per kilogram of body weight — essential for pediatrics and many adult medications), and IV drip rate (determining the drops per minute needed to deliver a specific volume over a specified time).
Medication errors are one of the most common preventable adverse events in healthcare. Dosage calculation errors can result from misreading a decimal point, confusing units, or using the wrong formula. By automating calculations, this tool reduces the risk of human error and provides a reliable double-check for manual calculations.
In pediatric care, weight-based dosing is especially critical because children's metabolic rates and body surface areas differ significantly from adults. A small error in mg/kg can have amplified effects in a child. Similarly, IV drip rate accuracy is essential in critical care settings where precise fluid and medication delivery can be life-saving.
Using this calculator is straightforward. Follow these simple steps:
Choose from Liquid Medication, Weight-Based Dosage, or IV Drip Rate using the radio buttons at the top of the calculator.
Fill in the required fields for your selected mode. Each mode has specific inputs tailored to the calculation type.
Press the "Calculate Dosage" button to get instant results with a detailed step-by-step breakdown.
Read the results carefully. The step-by-step section shows the formula and arithmetic so you can verify the calculation.
⚠️ Important Medical Disclaimer: This Dosage Calculator is for informational and educational purposes only. It is not a substitute for professional medical training, clinical judgment, or independent verification. Always verify all dosage calculations with standard reference materials and consult a qualified healthcare provider, pharmacist, or drug reference before administering any medication. Never base clinical decisions solely on the results from this calculator.