mg ↔ mL Converter
Convert mg to mL (and back) from a concentration. Compute pediatric weight-based dose, handles syrups, suspensions and injectable solutions. A handy guide for nursing students and parents.
Medical warning: This digital tool is a calculation aid. It does not replace the expertise, prescription, or validation of a healthcare professional (doctor, pharmacist, registered nurse). Always verify dosages according to your facility's protocols before any administration.
Good to know :
This answer helps you understand a topic or make an estimate, but it is not a substitute for professional advice. For any important decision regarding your health, finances, rights, safety or administrative procedures, please consult an official source or a qualified specialist.
Go deeper
Why convert mg to mL?
On a medicine box, the dose is expressed in milligrams (mg) — the amount of active ingredient. But for a syrup or suspension, you administer a volume in milliliters (mL) with a syringe or measuring cup. To bridge the two, you need the concentration: how many mg of active substance are dissolved in each mL of liquid.
This tool applies the standard pharmaceutical formula: volume (mL) = dose (mg) ÷ concentration (mg/mL). It works in reverse (volume → dose) and offers a third mode to compute a pediatric dose in mg/kg/intake.
Pharmaceutical formulas cheatsheet
mg → mL
Volume = Dose ÷ Concentration. Example: 250 mg of paracetamol at 100 mg/5 mL → 12.5 mL.
mL → mg
Dose = Volume × Concentration. Useful to check what a pre-filled syringe contains.
mg/kg → mL
Total dose = weight × unit posology, then divide by the concentration to obtain the volume.
Ratio (1:1000)
A 1:X ratio means 1 g per X mL, i.e. (1000/X) mg/mL. Epinephrine 1:1000 = 1 mg/mL.
The 5 golden rules before administration
- Right patient — check name, surname, date of birth.
- Right drug — confirm the active ingredient on the box.
- Right dose — cross-check the math with a colleague or a pharmacist.
- Right route — oral, IM, IV: never mix up presentations.
- Right time — respect the interval between two intakes.
This tool is an educational aid, it does not replace the medical prescription or the nursing double-check.
FAQ
Can I convert mg to mL without knowing the concentration?
No, it's impossible. mg is a mass unit (how much active substance) and mL a volume unit (the amount of liquid). To go from one to the other, you must know the medicine's concentration, written on the box or leaflet (e.g. 100 mg/5 mL).
How to read the concentration on a syrup bottle?
Look for a mention like "X mg / Y mL" or "X mg / dosing cup of Y mL". Common example: Doliprane 2.4% = 24 mg/mL. If you see "g/100 mL", multiply by 10 to get mg/mL.
How to convert µg (micrograms) to mg?
1 mg = 1,000 µg. To convert µg to mg, divide by 1,000. Example: a 500 µg dose equals 0.5 mg. Enter that value in mg in the tool to get the matching volume.
How do I compute a dose in IU (international units)?
IU don't convert directly to mg: each substance (insulin, vitamin D, heparin…) has its own conversion factor. Refer to the leaflet or pharmacopoeia for the IU ↔ mg ratio, then use the tool to switch to mL.
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