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Pediatric mg to mL conversion worksheet
Practice reading oral liquid concentration labels and converting checked-safe pediatric mg doses into mL volumes.
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Safety disclaimer
- Educational practice only; not medical advice or a medication order.
- Do not use worksheet examples for real patient dosing decisions.
- Always verify medication, dose, concentration, route, allergies, maximum dose, timing, measuring device, rounding, and local policy with licensed clinical guidance.
Before converting mg to mL
- Dose already checked against safe range and maximums
- Medication and route identified
- Concentration read from the exact label on hand
- mg/mL calculated correctly
- Final mL rounded only as instructed by assignment, device, or policy
Formula reminders
Concentration
label mg ÷ label mL = mg/mL
Volume
ordered mg ÷ mg/mL = mL
Compare bottles
same mg dose can equal different mL volumes
If the concentration is missing or unclear, do not guess. Flag the problem for clarification. Follow instructor or policy directions for rounding.
Practice problems
| # | Problem | Work space | Final check |
|---|---|---|---|
| 1 | Checked-safe order: 80 mg PO. Concentration: 160 mg / 5 mL. How many mL? | ☐ Label checked ☐ Units cancel ☐ mL reasonable | |
| 2 | Checked-safe order: 150 mg PO. Concentration: 100 mg / 5 mL. How many mL? | ☐ Label checked ☐ Units cancel ☐ mL reasonable | |
| 3 | Checked-safe order: 320 mg PO. Concentration: 400 mg / 5 mL. How many mL? | ☐ Label checked ☐ Units cancel ☐ mL reasonable | |
| 4 | Checked-safe order: 240 mg PO. Compare concentration A: 250 mg / 5 mL vs concentration B: 400 mg / 5 mL. How many mL for each? | ☐ Label checked ☐ Units cancel ☐ mL reasonable | |
| 5 | Practice order: 125 mg PO. Bottle concentration is not provided. What should the student do? | ☐ Label checked ☐ Units cancel ☐ mL reasonable | |
| 6 | Checked-safe order: 90 mg PO. Concentration: 120 mg / 5 mL. Calculate mL and round to the nearest tenth for the exercise. | ☐ Label checked ☐ Units cancel ☐ mL reasonable | |
| 7 | Checked-safe order: 62.5 mg PO. Concentration: 125 mg / 5 mL. How many mL? | ☐ Label checked ☐ Units cancel ☐ mL reasonable | |
| 8 | Checked-safe order: 45 mg PO. Concentration: 15 mg / 5 mL. How many mL, and is the volume reasonable to re-check? | ☐ Label checked ☐ Units cancel ☐ mL reasonable |
Answer key — reference only
- 160 mg / 5 mL = 32 mg/mL. 80 ÷ 32 = 2.5 mL.
- 100 mg / 5 mL = 20 mg/mL. 150 ÷ 20 = 7.5 mL.
- 400 mg / 5 mL = 80 mg/mL. 320 ÷ 80 = 4 mL.
- A: 250 mg / 5 mL = 50 mg/mL; 240 ÷ 50 = 4.8 mL. B: 400 mg / 5 mL = 80 mg/mL; 240 ÷ 80 = 3 mL.
- Flag/clarify: the concentration is required before converting mg to mL.
- 120 mg / 5 mL = 24 mg/mL. 90 ÷ 24 = 3.75 mL, which rounds to 3.8 mL for this exercise.
- 125 mg / 5 mL = 25 mg/mL. 62.5 ÷ 25 = 2.5 mL.
- 15 mg / 5 mL = 3 mg/mL. 45 ÷ 3 = 15 mL. Re-check because the volume is large for an oral liquid dose.