Why does 15 mg/5 mL equal 3 mg per mL?

Because the strength on the label describes a volume larger than one millilitre, so it has to be reduced before it is useful. Dividing the milligrams by the millilitres in the printed ratio gives 3 mg in every single millilitre, which is the number the syringe markings actually work with.

What if my bottle shows a different strength?

Use the strength in your hand, not the one you remember. Pharmacies substitute concentrations between refills, and pediatric and geriatric suspensions are the most common swaps. The calculator on this page accepts any dose, and the main converter accepts any concentration, so re-run the numbers whenever a new bottle comes home.

How should the volume be measured?

With the oral syringe or dosing cup dispensed with the medication. Kitchen teaspoons vary from roughly 2.5 mL to 7 mL, which is enough to turn a correct prescription into a wrong dose. Any volume with a decimal in it belongs in a syringe.

Is this chart safe for injections or insulin?

No. Insulin is dosed in units with a matched insulin syringe, and injectables should be drawn only by someone trained on that drug and device. This chart is for oral liquids, suspensions, and syrups.

Prednisolone 15 mg/5 mL Dosage Chart (mg to mL)

A Prednisolone 15 mg/5 mL liquid contains 3 mg in every millilitre, so 7.5 mg is 2.5 mL, 15 mg is 5 mL, and 30 mg is 10 mL. Divide the prescribed milligrams by 3 to get the volume to draw up.

How to use the Prednisolone 15 mg/5 mL Dosage Chart (mg to mL)

Enter your information in the fields above.
Review your instant prednisolone 15 mg/5 ml dosage chart (mg to ml) result and what it means.
Use the related tools and guides below for next steps.

Prescribed dose (mg)

15 mg/5 mL dosage chart

Every row below assumes the bottle reads 15 mg/5 mL, which is 3 mg in each millilitre. Find the milligram dose you were told to give in the left column and draw up the volume beside it.

Milligram dose to millilitre volume at 15 mg/5 mL
Dose (mg)	Volume (mL)
25 mg	8.33 mL
50 mg	16.67 mL
75 mg	25 mL
100 mg	33.33 mL
125 mg	41.67 mL
150 mg	50 mL
200 mg	66.67 mL
250 mg	83.33 mL
300 mg	100 mL
400 mg	133.33 mL
500 mg	166.67 mL
625 mg	208.33 mL
750 mg	250 mL
875 mg	291.67 mL
1000 mg	333.33 mL

Millilitre volume to milligram dose at 15 mg/5 mL
Volume (mL)	Dose (mg)
0.25 mL	0.75 mg
0.5 mL	1.5 mg
1 mL	3 mg
1.5 mL	4.5 mg
2 mL	6 mg
2.5 mL	7.5 mg
3 mL	9 mg
5 mL	15 mg
7.5 mL	22.5 mg
10 mL	30 mg
15 mL	45 mg
20 mL	60 mg

Reading a 15 mg/5 mL label without second-guessing it

The most frequent error with this strength is treating the first number as milligrams per millilitre. A 15 mg/5 mL bottle is not a 15 mg/mL liquid unless the label says so; the ratio has to be divided down first. Getting that step wrong shifts the volume by five times in either direction, which is the difference between a dose that does nothing and one that needs a call to poison control.

A quick sanity check catches most of it: a single oral dose above roughly 20 mL or below 0.2 mL deserves a second look before it is given. If the number from the chart feels far off what the pharmacy handed you last time, confirm the strength on the new bottle rather than reusing the old volume.

Charts for other label strengths

For any strength not listed, use the full medication dose converter or turn the doses into a daily routine with the medication schedule planner. The formula behind every row is worked step by step in mg to mL dosage calculations.

Frequently Asked Questions

Disclaimer: This tool is for educational purposes only. Consult a healthcare professional for medical advice.