MG to ML Converter Dosage Chart
Converting milligrams (mg) to milliliters (mL) requires knowing the density of the liquid. For water-based solutions, 1 mL ≈ 1,000 mg (since water density = 1 g/mL). For supplement liquids like magnesium citrate, melatonin drops, and liquid vitamins, the concentration on the label (mg/mL) is the key conversion factor.
MG to ML Converter Dosage by Age Group
| Age Group | Age Range | Dose Range | Notes |
|---|---|---|---|
| Water-based solution (reference) | N/A | 1000 mg | 1 mL water = 1,000 mg (density 1 g/mL) |
| Magnesium citrate liquid | Adults | 170–175 mg | Per mL; typical 10 fl oz bottle = 1,700 mg Mg citrate |
| Liquid melatonin (typical) | Adults | 1–10 mg | 1–10 mg per mL varies greatly by product |
| Liquid vitamin D3 (typical) | Adults | 1000–2000 IU | IU per drop or per mL; read label carefully |
| Syrup / suspension (general) | Adults | 0 mg | Varies by product; always check mg/mL on label |
MG to ML Converter
Convert milligrams to milliliters for liquid supplements. Select the liquid type or enter a custom mg/mL concentration from your supplement label.
Common Liquid Supplement Concentrations
| Supplement | Concentration | Example: 500 mg = |
|---|---|---|
| Water / water-based solution | 1,000 mg/mL | 0.5 mL |
| Magnesium citrate (OTC laxative) | ~170 mg/mL | ~2.9 mL |
| Liquid vitamin C (250 mg/5 mL) | 50 mg/mL | 10 mL |
| Melatonin drops (1 mg/mL) | 1 mg/mL | 500 mL (too high) |
| Pediatric ibuprofen (100 mg/5mL) | 20 mg/mL | 25 mL |
Safety Cautions
- Never assume 1 mg = 1 mL or 1 mL = 1 mg for supplements — this conversion only applies to pure water at standard conditions.
- Always read the 'concentration per mL' on your supplement label before calculating doses.
- Oral syringes are more accurate than teaspoons for liquid supplement dosing — 5 mL ≈ 1 teaspoon but household spoons vary by 20%.
- For pediatric liquid medications, only use the measuring device provided with the product.
Frequently Asked Questions
How do I convert mg to ml for liquid supplements?
Divide the milligram dose by the concentration (mg/mL) listed on the label. If your supplement contains 200 mg per 5 mL (40 mg/mL) and you need 100 mg, calculate: 100 mg ÷ 40 mg/mL = 2.5 mL. Always check the label for concentration — it varies by product.
Is 1 mg the same as 1 ml?
No. 1 mg (milligram) is a unit of mass; 1 mL (milliliter) is a unit of volume. They are only numerically equal for pure water, where 1 mL weighs approximately 1,000 mg (or 1 gram). For most liquid supplements, the conversion factor is different — it depends on the solution's concentration and density.
How many ml is 500 mg?
It depends on the liquid concentration. For pure water: 500 mg = 0.5 mL. For a 250 mg/5 mL syrup (50 mg/mL): 500 mg ÷ 50 mg/mL = 10 mL. For a 100 mg/mL solution: 500 mg ÷ 100 mg/mL = 5 mL. Always check the concentration on your specific product label.
Sources & References
- NIST Handbook of Mathematical Functions
- USP Compounding Standards — Concentration notation