Pharmacy tools
Liquid Dose Calculator
Convert an ordered mg dose into mL using the liquid’s concentration (mg/mL).
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Version 1.0.0 · Last reviewed
Tool
Result
Live output from your inputs
Enter values and calculate to see results.
How it worksShow guideHide guide
Introduction
Convert an ordered milligram dose into milliliters using the product concentration (mg/mL). Common for syrups, suspensions, and injectable vials.
Disclaimer: This tool is for informational purposes only and is not professional medical, pharmaceutical, financial, or tax advice. Always verify doses with a licensed clinician or pharmacist.
Formula
Volume to administer equals the ordered dose divided by the liquid concentration.
- V — Volume to give (mL)
- D — Ordered dose (mg)
- C — Concentration (mg/mL)
Step-by-step
- Enter the ordered dose in milligrams.
- Enter the concentration in mg per mL from the label.
- Read the volume to give in milliliters.
Worked example
250 mg ordered from a 50 mg/mL suspension requires 5 mL.
Use cases
- Figure how many mL of a syrup to measure
- Check injectable reconstitution draw-up volumes
- Teach pharmacy technician liquid dose math
Frequently asked questions
What if the label is mg/5 mL?
Convert to mg/mL first. Example: 250 mg/5 mL = 50 mg/mL.
Is rounding included?
Results show up to three decimal places. Follow your site’s rounding and measuring-device policy for the final dispensed volume.
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