Enter mg/mL concentration for mg↔mL conversions
Converted Value
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⚠️ Critical Safety Note: Always verify conversions independently and confirm with a pharmacist before administering any medication. A 10-fold dosing error is one of the most common medication mistakes, especially with mcg vs mg confusion.
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Sources & Methodology
All conversion factors follow SI (International System of Units) standards and USP (United States Pharmacopeia) volume measurement conventions.
Medication Dosage Conversion Reference
Accurate unit conversion is critical in medication administration. A confusion between mcg and mg — a 1,000-fold difference — is one of the most dangerous medication errors in healthcare. This calculator covers all common medical weight and volume units.
Weight Conversions
1 g = 1,000 mg = 1,000,000 mcg
1 kg = 1,000 g = 2.2046 lb | 1 oz = 28,349.5 mg | 1 lb = 453.592 g
Volume Conversions
1 tbsp = 15 mL | 1 tsp = 5 mL | 1 fl oz = 29.5735 mL
1 L = 1,000 mL | 1 cup = 240 mL = 48 tsp = 16 tbsp
Common Pediatric Dose Conversions
- Acetaminophen (Tylenol): 10–15 mg/kg every 4–6 hours. 160 mg/5 mL suspension = 32 mg/mL
- Ibuprofen (Advil/Motrin): 5–10 mg/kg every 6–8 hours. 100 mg/5 mL suspension = 20 mg/mL
- Amoxicillin: 25–45 mg/kg/day divided every 8–12 hours. Available in 250 mg/5 mL or 400 mg/5 mL
💡 Safety Tip: When in doubt between mcg and mg on a prescription or label, always confirm with the prescribing physician or pharmacist before administering. A 10× or 1,000× error in medication dosing can be life-threatening.
Frequently Asked Questions
How many mg are in 1 mL of a medication?
This depends entirely on the concentration of the medication. A 10 mg/mL solution contains 10 mg per mL. A 200 mg/5 mL suspension contains 40 mg per mL. Always check the medication label or prescription for the specific concentration before converting between mg and mL.
What is the difference between mcg and mg?
1 milligram (mg) = 1,000 micrograms (mcg). The "micro" prefix means one-millionth, so 1 mcg = 0.000001 g. Confusing these two units is one of the leading causes of medication overdose. For example, 100 mcg of fentanyl is a standard analgesic dose, but 100 mg would be a potentially fatal 1,000× overdose.
How do I calculate a weight-based pediatric dose?
Multiply the prescribed dose rate (mg/kg) by the child's weight in kg. For a 25 kg child prescribed 10 mg/kg of amoxicillin: 10 × 25 = 250 mg. Then divide by the medication concentration to get volume: 250 mg ÷ 50 mg/mL = 5 mL. Always confirm with the physician or pharmacist and double-check the calculation.
How many teaspoons is 10 mL?
10 mL = 2 teaspoons. The standard conversion is 1 teaspoon = 5 mL. This is why many pediatric liquid medications use 5 mL as a dose — it equates to exactly 1 tsp, making home measurement simpler. Use a proper measuring syringe rather than a household teaspoon, which can vary significantly in actual volume.
Can I use a regular kitchen teaspoon to measure medications?
No — household teaspoons can vary from 3 to 7 mL, which introduces significant dosing error. Always use a calibrated oral syringe, medicine cup, or dosing spoon provided with the medication or obtained from a pharmacy. This is especially important for pediatric liquid medications where the therapeutic window may be narrow.
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