How do you convert mg to mL?

Divide the milligrams by the concentration in mg per mL: mL = mg ÷ (mg/mL). Get the concentration from the label — if it says 160 mg per 5 mL, the concentration is 160 ÷ 5 = 32 mg/mL, so a 160 mg dose is 5 mL. Without a concentration there is no single answer, because mg is weight and mL is volume.

How many mg are in a mL?

For water, 1,000 mg — 1 mL of water weighs 1 gram. For anything else it depends on what is dissolved in it: children’s acetaminophen has 32 mg of drug per mL (160 mg/5 mL), children’s ibuprofen 20 mg/mL (100 mg/5 mL), and testosterone cypionate 200 mg/mL. Read the “mg per mL” or “mg per 5 mL” line on the label.

How many mL are in a mg?

For water, 0.001 mL — one milligram of water is one thousandth of a milliliter (one microliter). For a medicine, 1 mg = 1 ÷ concentration mL: at 10 mg/mL, 1 mg is 0.1 mL; at 2.5 mg/mL it is 0.4 mL.

Is 1 mg the same as 1 mL?

No. A milligram is a unit of mass and a milliliter is a unit of volume. Only for water does 1 mL weigh exactly 1,000 mg (1 g). Confusing mg with mL is a common cause of medication errors — the FDA has reported overdoses of 5 to 20 times the intended dose from this mix-up with compounded semaglutide.

What is 2.5 mg in mL?

It depends on the concentration. At 10 mg/mL (a common compounded tirzepatide strength), 2.5 mg = 0.25 mL, which is 25 units on a U-100 insulin syringe. At 2.5 mg/mL, 2.5 mg = 1 mL; at 5 mg/mL, 0.5 mL. For water, 2.5 mg is just 0.0025 mL.

At 1 mg/mL (e.g. cetirizine syrup), 5 mg = 5 mL. At 2.5 mg/mL (diphenhydramine 12.5 mg/5 mL), 5 mg = 2 mL. At 5 mg/mL, 1 mL; at 10 mg/mL, 0.5 mL. The formula is always mL = 5 ÷ mg per mL.

How many mL is 10 mg?

10 mg is 10 mL at 1 mg/mL, 4 mL at 2.5 mg/mL, 2 mL at 5 mg/mL, 1 mL at 10 mg/mL and 0.5 mL at 20 mg/mL. In water, 10 mg is 0.01 mL.

1 mg of water is 0.001 mL. For a medicine, divide 1 by the concentration: 1 mL at 1 mg/mL, 0.4 mL at 2.5 mg/mL, 0.1 mL at 10 mg/mL.

How many mL is 100 mg?

100 mg of children’s ibuprofen (100 mg per 5 mL) is 5 mL. 100 mg at 200 mg/mL is 0.5 mL, at 50 mg/mL 2 mL, at 20 mg/mL 5 mL. 100 mg of water is 0.1 mL. Going the other way, 5 mL of children’s ibuprofen contains 100 mg.

How many mL is 500 mg?

For amoxicillin 250 mg/5 mL, 500 mg = 10 mL; for the 400 mg/5 mL suspension, 500 mg = 6.25 mL. 500 mg of water is 0.5 mL. Always use the strength on your own bottle — the same drug comes in several strengths.

How many mL is 1,000 mg?

1,000 mg (1 g) of water is exactly 1 mL. For a 1,000 mg CBD oil in a 30 mL bottle the concentration is 33.3 mg/mL, so the whole bottle is the 1,000 mg — 1 mL contains about 33 mg. 1,000 mg of vegetable oil is about 1.09 mL because oil is lighter than water.

How do I convert mL to mg?

Multiply: mg = mL × concentration (mg/mL). 5 mL of children’s ibuprofen (20 mg/mL) is 100 mg; 10 mL of a 2% solution (20 mg/mL) is 200 mg; 1 mL of water is 1,000 mg. Switch the calculator to “mL → mg”.

How many mg are in 5 mL (a teaspoon)?

Exactly what the label says per 5 mL: 160 mg for children’s acetaminophen, 100 mg for children’s ibuprofen, 12.5 mg for diphenhydramine, 5 mg for cetirizine, 250 or 400 mg for amoxicillin. 5 mL of water weighs 5,000 mg (5 g). Measure medicine with the syringe or cup that comes with it, not a kitchen spoon.

How many units is 0.25 mg of semaglutide?

At 2.5 mg/mL, 0.25 mg = 0.1 mL = 10 units on a U-100 insulin syringe. At 5 mg/mL it is 0.05 mL = 5 units. A 1 mg dose at 5 mg/mL is 20 units. Vial strengths differ between compounding pharmacies, so always use the strength on your vial.

How many units is 2.5 mg of tirzepatide?

At 10 mg/mL, 2.5 mg = 0.25 mL = 25 units; 5 mg = 0.5 mL = 50 units. At 20 mg/mL, 2.5 mg is 12.5 units. Confirm the units with your pharmacy before the first dose.

How do I convert mg to units on an insulin syringe?

First convert mg to mL (mg ÷ mg/mL), then multiply by 100: a U-100 insulin syringe holds 100 units per mL, so 1 unit = 0.01 mL. Units = mg ÷ (mg/mL) × 100. This only works for U-100 syringes; 0.3 mL, 0.5 mL and 1 mL U-100 syringes all use the same 1 unit = 0.01 mL scale.

How many mL is 200 mg of testosterone?

Testosterone cypionate usually comes as 200 mg/mL, so 200 mg = 1 mL, 100 mg = 0.5 mL and 50 mg = 0.25 mL. Some vials are 100 mg/mL, where 200 mg is 2 mL — check yours.

How many mL of children’s Tylenol or Motrin is a dose?

This page converts mg to mL; it does not choose the dose. Once you know the mg dose from the package or your pediatrician, children’s acetaminophen (160 mg/5 mL) needs 1 mL per 32 mg, so 160 mg = 5 mL. Children’s ibuprofen (100 mg/5 mL) needs 1 mL per 20 mg. Infants’ ibuprofen drops are twice as strong (50 mg/1.25 mL). For weight-based doses use our Tylenol and ibuprofen dosage calculators.

Is there an mg to mL conversion chart?

Yes — the charts below list 1 mg to 1,000 mg in water, a dose-by-concentration chart (1–200 mg/mL), common liquid medicine labels, and semaglutide and tirzepatide units. Every value is generated by the same formulas as the calculator.

How do I convert mcg to mL?

Convert mcg to mg first (1,000 mcg = 1 mg), then divide by the mg/mL concentration. 500 mcg at 1 mg/mL is 0.5 mL. If the label is in mcg/mL, divide mcg by mcg/mL directly. Pick “mcg” as the amount unit in the calculator.

How do I convert a percent solution to mg/mL?

Multiply the percent by 10. A w/v percentage means grams per 100 mL, so 1% = 1 g/100 mL = 10 mg/mL, 2% lidocaine = 20 mg/mL, and 0.9% saline = 9 mg/mL of sodium chloride.

How many drops are in a mL?

About 20 with a standard dropper, so one drop is about 0.05 mL. Real droppers range from roughly 15 to 30 drops per mL depending on the tip and the liquid, so never dose a medicine by drops unless the product’s own dropper is marked in mL or drops.

How many mg are in a mL of milk or oil?

Milk is about 1,030 mg per mL (1.028–1.035 g/mL), vegetable oil about 920 mg per mL (0.914–0.927 g/mL), olive oil about 918 mg, honey about 1,420 mg and ethanol 789 mg. Choose “Liquid density” in the calculator and pick the liquid.

Why should liquid medicine be measured in mL, not teaspoons?

The American Academy of Pediatrics recommends dosing oral liquids only in metric units (mL), with leading zeros (0.5 mL, not .5 mL), no trailing zeros, and an oral syringe or marked cup. Kitchen spoons vary widely in size, and “tsp” is easily mistaken for “tbsp” — three times the dose.

How do I find how many doses are in a bottle?

Total mg in the bottle = mg/mL × bottle mL; doses = total mg ÷ dose mg. A 30 mL bottle of 1,000 mg CBD oil holds 40 doses of 25 mg (0.75 mL each). Use the “Bottle & doses” tab; leave a little extra for liquid lost in the dropper or vial.

How does this mg to mL calculator work?

It turns your input into a concentration in mg/mL — label amount ÷ label volume, percent × 10, or density in g/mL × 1,000 — converts mcg and g to mg, then applies mL = mg ÷ mg/mL (or mg = mL × mg/mL). It also shows U-100 syringe units (mL × 100), teaspoons (mL ÷ 5) and drops (mL × 20), and warns when a volume is too small to measure or larger than a 1 mL syringe.

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Unit conversion · medicine labels, GLP-1 vials & liquids · updated October 2, 2026

mg to mL Calculator: Convert Milligrams to Milliliters

Quick answer

mL = mg ÷ concentration (mg per mL). For water, 1 mL = 1,000 mg, so 1 mg = 0.001 mL. For a medicine, use the strength on the label: 2.5 mg of a 10 mg/mL vial is 0.25 mL (25 units on an insulin syringe), and 160 mg of children’s acetaminophen (160 mg/5 mL) is 5 mL. To go back, mg = mL × mg/mL. mg is weight and mL is volume, so there is no single mg-to-mL factor without a concentration.

Convert any dose from milligrams to milliliters (or mL to mg) using the strength on your medicine label, a percent solution or a liquid’s density. Turn mg into U-100 syringe units for semaglutide, tirzepatide or B12, and see how many doses are in a bottle or vial.

mg ↔ mL from any label, mcg, mg or g
12 common label strengths built in
U-100 syringe units for GLP-1 vials
Water, milk, oil and other liquids by density

Last updated October 2, 2026. Free, no sign-up. Guides: how to convert mg to mL · how many mg in a mL

mg to mL Calculator

Convert milligrams to milliliters (and back) from a medicine label, percent solution or liquid density — plus syringe units and doses per bottle.

Amount (weight)(mg)

Common label (optional)

Label amount(mg)

per volume(mL)

2.5 mg equals

0.25 mL

at 10 mg/mL

Concentration

10 mg/mL

50 mg per 5 mL

U-100 syringe

25 units

100 units = 1 mL

Concentration: 10 mg/mL (from the label).
Volume: 2.5 mg ÷ 10 mg/mL = 0.25 mL.
On a U-100 insulin syringe that is 25 units (100 units = 1 mL).

Educational conversion, not dosing advice. Use the dosing device that came with the medicine and follow your prescriber or pharmacist.

How mg to mL is calculated

Milligrams (mg) measure mass and milliliters (mL) measure volume, so converting between them needs a concentration. For a medicine, mL = mg ÷ concentration in mg/mL, where the concentration is the strength printed on the label (for example 160 mg per 5 mL = 32 mg/mL). For a pure liquid the concentration is its density: water is 1 g/mL, so 1 mL of water weighs 1,000 mg and 1 mg of water is 0.001 mL.

concentration (mg/mL) = label mg ÷ label mL · or % × 10 · or density g/mL × 1,000
mL = mg ÷ concentration · mg = mL × concentration · U-100 units = mL × 100 · tsp = mL ÷ 5

Label: 2.5 mg from a vial labelled 10 mg/mL → 2.5 ÷ 10 = 0.25 mL = 25 units.
Label per 5 mL: amoxicillin 250 mg/5 mL = 50 mg/mL, so 500 mg → 500 ÷ 50 = 10 mL.
Micrograms: 500 mcg = 0.5 mg; at 1 mg/mL → 0.5 mL.
Percent: 2% = 20 mg/mL, so 10 mL contains 200 mg.
Density: water is 1 g/mL = 1,000 mg/mL, so 250 mg of water = 0.25 mL.

Medication safety

This calculator converts units; it does not tell you how much medicine to take. Use the dose from your prescriber, pharmacist or the package, and the measuring device supplied with the medicine. The same drug comes in different strengths (infants’ ibuprofen is twice as concentrated as children’s), and compounded GLP-1 vials vary between pharmacies — the FDA has linked mg/mL/“units” mix-ups to overdoses and hospitalizations. If a result looks unusual, stop and ask a pharmacist. In the U.S., Poison Control is 1-800-222-1222.

mg to mL for water

1 mL of water weighs 1,000 mg (1 g), so divide mg by 1,000.

Milligrams	Milliliters	Microliters
1 mg	0.001 mL	1 µL
2.5 mg	0.0025 mL	2.5 µL
5 mg	0.005 mL	5 µL
10 mg	0.01 mL	10 µL
20 mg	0.02 mL	20 µL
25 mg	0.025 mL	25 µL
50 mg	0.05 mL	50 µL
100 mg	0.1 mL	100 µL
200 mg	0.2 mL	200 µL
250 mg	0.25 mL	250 µL
500 mg	0.5 mL	500 µL
1,000 mg	1 mL	1,000 µL

mg to mL conversion chart by concentration

mL needed for each dose at common concentrations. Find your label’s mg/mL across the top.

Dose	1 mg/mL	2.5 mg/mL	5 mg/mL	10 mg/mL	20 mg/mL	50 mg/mL	100 mg/mL	200 mg/mL
1 mg	1	0.4	0.2	0.1	0.05	0.02	0.01	0.005
2.5 mg	2.5	1	0.5	0.25	0.125	0.05	0.025	0.0125
5 mg	5	2	1	0.5	0.25	0.1	0.05	0.025
10 mg	10	4	2	1	0.5	0.2	0.1	0.05
20 mg	20	8	4	2	1	0.4	0.2	0.1
25 mg	25	10	5	2.5	1.25	0.5	0.25	0.125
50 mg	50	20	10	5	2.5	1	0.5	0.25
100 mg	100	40	20	10	5	2	1	0.5
200 mg	200	80	40	20	10	4	2	1
250 mg	250	100	50	25	12.5	5	2.5	1.25
500 mg	500	200	100	50	25	10	5	2.5
1,000 mg	1,000	400	200	100	50	20	10	5

Common liquid medicine strengths in mg per mL

Typical U.S. label strengths (DailyMed). Your product may differ — always read your own label. The GLP-1 vial strengths are examples only; compounded products vary.

Product	Label	Concentration	mg in 5 mL	mL for 10 mg
Children’s / infants’ acetaminophen (Tylenol)	160 mg per 5 mL	32 mg/mL	160 mg	0.3125 mL
Children’s ibuprofen (Motrin, Advil)	100 mg per 5 mL	20 mg/mL	100 mg	0.5 mL
Infants’ ibuprofen concentrated drops	50 mg per 1.25 mL	40 mg/mL	200 mg	0.25 mL
Children’s diphenhydramine (Benadryl)	12.5 mg per 5 mL	2.5 mg/mL	12.5 mg	4 mL
Children’s cetirizine (Zyrtec)	1 mg per mL	1 mg/mL	5 mg	10 mL
Amoxicillin suspension 250 mg/5 mL	250 mg per 5 mL	50 mg/mL	250 mg	0.2 mL
Amoxicillin suspension 400 mg/5 mL	400 mg per 5 mL	80 mg/mL	400 mg	0.125 mL
Testosterone cypionate 200 mg/mL	200 mg per mL	200 mg/mL	1,000 mg	0.05 mL
Semaglutide vial 2.5 mg/mL	Check your vial — strengths vary	2.5 mg/mL	12.5 mg	4 mL
Semaglutide vial 5 mg/mL	Check your vial — strengths vary	5 mg/mL	25 mg	2 mL
Tirzepatide vial 10 mg/mL	Check your vial — strengths vary	10 mg/mL	50 mg	1 mL
CBD oil 1,000 mg in a 30 mL bottle	33.3 mg per mL	33.3 mg/mL	167 mg	0.3 mL

Semaglutide mg to mL and units

U-100 syringe (100 units = 1 mL). Example compounded vial strengths.

Dose	2.5 mg/mL vial	5 mg/mL vial
0.25 mg	0.1 mL = 10 units	0.05 mL = 5 units
0.5 mg	0.2 mL = 20 units	0.1 mL = 10 units
1 mg	0.4 mL = 40 units	0.2 mL = 20 units
1.7 mg	0.68 mL = 68 units	0.34 mL = 34 units
2.4 mg	0.96 mL = 96 units	0.48 mL = 48 units

Tirzepatide mg to mL and units

Over 100 units means more than one 1 mL syringe — check with your pharmacy.

Dose	10 mg/mL vial	20 mg/mL vial
2.5 mg	0.25 mL = 25 units	0.125 mL = 12.5 units
5 mg	0.5 mL = 50 units	0.25 mL = 25 units
7.5 mg	0.75 mL = 75 units	0.375 mL = 37.5 units
10 mg	1 mL = 100 units	0.5 mL = 50 units
12.5 mg	1.25 mL = 125 units	0.625 mL = 62.5 units
15 mg	1.5 mL = 150 units	0.75 mL = 75 units

How many mg in a mL of common liquids

Weight of the liquid itself. Food values vary with fat content and temperature.

Liquid	Density	Range	mg per mL	mL per 1,000 mg
Water	1 g/mL	0.998 at 20 °C	1,000 mg	1 mL
Milk	1.03 g/mL	1.028–1.035	1,030 mg	0.9709 mL
Vegetable / cooking oil	0.92 g/mL	0.914–0.927	920 mg	1.09 mL
Olive oil	0.918 g/mL	0.91–0.92	918 mg	1.09 mL
Honey	1.42 g/mL	—	1,420 mg	0.7042 mL
Ethanol (alcohol)	0.789 g/mL	—	789 mg	1.27 mL
Glycerin	1.26 g/mL	—	1,260 mg	0.7937 mL
Seawater	1.03 g/mL	—	1,030 mg	0.9709 mL

Mass and volume units

Unit	Equals	Also
1 gram (g)	1,000 mg	1,000,000 mcg
1 milligram (mg)	1,000 mcg (µg)	0.001 g
1 microgram (mcg, µg)	0.001 mg	0.000001 g
1 milliliter (mL)	1 cc (cubic centimeter)	100 units on a U-100 syringe
1 teaspoon (tsp)	5 mL	Use an oral syringe for medicine
1 tablespoon (tbsp)	15 mL	3 teaspoons
1 US fluid ounce	29.57 mL	about 30 mL
1 drop (standard dropper)	about 0.05 mL	≈ 20 drops per mL; droppers vary

Find the mg/mL

The concentration is on the label as “mg per mL” or “mg per 5 mL”. Divide to get mg per 1 mL before converting.

Units are not mg

Syringe “units” measure volume (1 unit = 0.01 mL on U-100). The mg in each unit depends on the vial strength.

Measure in mL

Use an oral syringe or dosing cup marked in mL. Write 0.5 mL, never .5 mL, and avoid kitchen spoons.

Sources and how this calculator was checked

Label strengths were checked against DailyMed, safety guidance against the FDA and the American Academy of Pediatrics, and liquid densities against the FAO/INFOODS database and CRC data. The drop count (20 per mL) is the conventional metric-dropper figure. Every table on this page is generated by the same code as the calculator. This is a unit-conversion tool, not medical advice.

FDA — Dosing errors associated with compounded semaglutide (July 26, 2024)Patients overdosed 5–20× after confusing mg, mL and “units”; asks for doses in both mg and mL/units and the right syringe.
FDA — Concerns with unapproved GLP-1 drugs used for weight lossCompounded semaglutide and tirzepatide vary in concentration; dosing errors and hospitalizations reported.
American Academy of Pediatrics — Metric units and the preferred dosing of orally administered liquid medicationsDose liquids in mL only, use leading zeros and no trailing zeros, round to 0.1, 0.5 or 1 mL, and dispense oral syringes.
DailyMed (U.S. National Library of Medicine) — drug labelsLabel strengths for children’s acetaminophen, ibuprofen, diphenhydramine, cetirizine, amoxicillin and testosterone cypionate.
FAO/INFOODS Density Database v1.0Densities of milk (~1.03 g/mL), vegetable oils (0.914–0.927 g/mL), honey and ethanol.
Simon Fraser University — Densities of common liquids (CRC data)Water 0.998 g/mL at 20 °C, milk 1.028–1.035, glycerin 1.26, seawater 1.03.
NIST — SI units and metric prefixesmilli = 10⁻³ and micro = 10⁻⁶: 1 g = 1,000 mg = 1,000,000 mcg; 1 mL = 1 cm³.

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mg to mL Converter

Quick milligram-to-milliliter conversion for water, milk and oil.

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mg to mL Calculator: Convert Milligrams to Milliliters

How mg to mL is calculated

mg to mL for water

mg to mL conversion chart by concentration

Common liquid medicine strengths in mg per mL

Semaglutide mg to mL and units

Tirzepatide mg to mL and units

How many mg in a mL of common liquids

Mass and volume units

Sources and how this calculator was checked

Frequently Asked Questions

How do you convert mg to mL?

How many mg are in a mL?

How many mL are in a mg?

Is 1 mg the same as 1 mL?

What is 2.5 mg in mL?

How many mL is 5 mg?

How many mL is 10 mg?

What is 1 mg to mL?

How many mL is 100 mg?

How many mL is 500 mg?

How many mL is 1,000 mg?

How do I convert mL to mg?

How many mg are in 5 mL (a teaspoon)?

How many units is 0.25 mg of semaglutide?

How many units is 2.5 mg of tirzepatide?

How do I convert mg to units on an insulin syringe?

How many mL is 200 mg of testosterone?

How many mL of children’s Tylenol or Motrin is a dose?

Is there an mg to mL conversion chart?

How do I convert mcg to mL?

How do I convert a percent solution to mg/mL?

How many drops are in a mL?

How many mg are in a mL of milk or oil?

Why should liquid medicine be measured in mL, not teaspoons?

How do I find how many doses are in a bottle?

How does this mg to mL calculator work?

Related Calculators

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mg to mL Calculator: Convert Milligrams to Milliliters

How mg to mL is calculated

mg to mL for water

mg to mL conversion chart by concentration

Common liquid medicine strengths in mg per mL

Semaglutide mg to mL and units

Tirzepatide mg to mL and units

How many mg in a mL of common liquids

Mass and volume units

Sources and how this calculator was checked

Frequently Asked Questions

How do you convert mg to mL?

How many mg are in a mL?

How many mL are in a mg?

Is 1 mg the same as 1 mL?

What is 2.5 mg in mL?

How many mL is 5 mg?

How many mL is 10 mg?

What is 1 mg to mL?

How many mL is 100 mg?

How many mL is 500 mg?

How many mL is 1,000 mg?

How do I convert mL to mg?

How many mg are in 5 mL (a teaspoon)?

How many units is 0.25 mg of semaglutide?

How many units is 2.5 mg of tirzepatide?

How do I convert mg to units on an insulin syringe?

How many mL is 200 mg of testosterone?

How many mL of children’s Tylenol or Motrin is a dose?

Is there an mg to mL conversion chart?

How do I convert mcg to mL?

How do I convert a percent solution to mg/mL?

How many drops are in a mL?

How many mg are in a mL of milk or oil?

Why should liquid medicine be measured in mL, not teaspoons?

How do I find how many doses are in a bottle?

How does this mg to mL calculator work?

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