What this calculator does

This tool converts a mass expressed in milligrams (mg) into a volume expressed in milliliters (mL) and vice-versa for liquids and suspensions where a concentration or density is known. It’s ideal for medication dosing, lab prep, and any situation where you need to know how much liquid corresponds to a given mass of active ingredient.

Why you can’t convert mg → mL without extra information

Milligrams measure mass; milliliters measure volume. To convert between them you must know how concentrated the substance is (commonly given as mg per mL) or its density. That concentration is the key different liquids with the same mass can occupy very different volumes.

How to use the calculator

1. Choose the substance or pick Medications and select a preset (or “Custom”) if you have a specific concentration.
2. Enter the Concentration (e.g., 50 mg/mL) or pick the unit that matches the label on the bottle.
3. Type a mass (e.g., 50 mg) in the mg field or a volume (e.g., 2 mL) in the mL field. The calculator fills the other field instantly.

The quick formulas

• Mass → Volume

Volume (mL) = Mass (mg) / Concentration (mg/mL)

• Volume → Mass

Mass (mg) = Volume (mL) × Concentration (mg/mL)

When concentration is given in other units (g/L, µg/mL, etc.) the calculator converts those into mg/mL first, so you don’t need to do extra math.

Practical examples

• Example 1 – medicine app: You have a medicine labeled 10 mg/mL. For a 50 mg dose: mL=50÷10=5 mL\text{mL} = 50 \div 10 = 5\ \text{mL}mL=50÷10=5 mL
• Example 2 – reverse check: A vial is 20 mg/mL and you draw 0.5 mL. The active mass is: mg=0.5×20=10 mg\text{mg} = 0.5 \times 20 = 10\ \text{mg}mg=0.5×20=10 mg
• Example 3 – density awareness: If you need to convert a solid’s mass to liquid volume (uncommon), supply the substance’s density in mg/mL; without a density or concentration, a correct conversion is impossible.

Accuracy & best practices

• Always use the exact concentration printed on the product label (e.g., mg/mL). If a medication label gives mg per 5 mL, convert it to mg/mL first (divide mg by 5).
• For injections or clinical dosing, double-check calculations and round only where clinically appropriate. When in doubt, confirm with a pharmacist or clinician.

Know Each parameter

• Conversion for: Choose the liquid type (water, milk, oil, medication) — used to pick sensible default densities or allow custom values.
• Medications: Preset concentrations for common liquid medicines; choose Custom to enter any concentration.
• Concentration: Strength of the solution (how many milligrams of active per milliliter of liquid). Enter the numeric value and select the unit (mg/mL, g/L, µg/mL, etc.).
• mg Value (Mass): The active ingredient’s mass; accepts µg, mg, g, kg (kg converts through mg internally). Enter this when you know the dose by weight.
• mL Value (Volume): The liquid volume; accepts mL, L, cc, tsp, tbsp. Enter this when you know how much liquid to draw up.

FAQ

Q1. Can I convert liquid medicines like ibuprofen or amoxicillin?

A: Yes. The calculator includes common medication concentrations (e.g., 400 mg/5 mL, 100 mg/5 mL, 50 mg/mL, etc.). You can also enter custom values for any prescription or OTC medicine.

Q2. What if my medication label shows mg per teaspoon (mg/tsp)?

A: Simply choose the correct unit in the dropdown or convert tsp to mL first:

• 1 teaspoon = 5 mL
• 1 tablespoon = 15 mL

Our calculator supports tsp, tbsp, mL, cc, and liters.

Q3. Is this accurate for injections?

A: Yes, just enter the concentration listed on the vial (e.g., 200 mg/mL testosterone or 50 mg/mL morphine). Always verify with medical guidance before dosing.

Q4. Why do medications have different mg per mL values?

A: Each drug has unique chemical properties and manufacturing standards. For example:

• Amoxicillin is often 400 mg / 5 mL
• Ibuprofen infant drops may be 50 mg / 1.25 mL or 100 mg / 5 mL

That’s why the concentration must match your bottle or prescription.

Q5. I only know the dose in mL. Can I convert mL to mg?

A: Absolutely. Enter the mL value and concentration the calculator instantly returns the mg equivalent.

Q6. Does 1 mL always equal 1 cc?

A: Yes, 1 mL = 1 cc. The terms are used interchangeably in medicine and syringe measurements.

Q7. Can this calculator be used for pets?

A: Yes, as long as the concentration is entered correctly. Always confirm with a veterinarian when dosing animals.

Q8. Does temperature change the mg to mL conversion?

A: For biological and medical solutions (like medications), temperature effect is negligible for routine dosing. Industrial chemical conversions may require density adjustments.

Q9. Can I use this for powder-based supplements?

A: Yes, but the powder must be mixed into a liquid concentration first. mg alone cannot convert to mL without a known mg/mL value.

Q10. What units does the calculator support?

• µg (micrograms)
• mg (milligrams)
• g (grams)
• mL (milliliters)
• L (liters)
• cc (cubic centimeters)
• tsp (teaspoon)
• tbsp (tablespoon)
• kg (for weight dosing mode)

Safety disclaimer

This calculator is an aid for conversions only. It does not replace professional medical judgment. For prescription dosing or emergency care, consult a licensed healthcare provider before administering medication. The tool assumes accurate concentration input; an incorrect concentration will yield an incorrect dose. Need to convert units directly to milliliters? Try Units to mL Calculator.