How much water for a 10 mg vial? (reverse math)
Water (mL) = 10 mg ÷ the concentration you want (mg/mL). 10 mg in 1 mL is 10 mg/mL, in 2 mL is 5 mg/mL, in 4 mL is 2.5 mg/mL and in 5 mL is 2 mg/mL. This is arithmetic only; it does not tell you which concentration or amount to use. Water changes concentration, not the 10 mg total.
The math
water (mL) = vial mg ÷ target concentration (mg/mL) mcg per U-100 unit = concentration (mg/mL) × 10 Example: 10 ÷ 2.5 = 4 mL; 2.5 × 10 = 25 mcg per unit
| Target mg/mL | Water for 10 mg | mcg per U-100 unit |
|---|---|---|
| 10 | 1 mL | 100 |
| 5 | 2 mL | 50 |
| 2.5 | 4 mL | 25 |
| 2 | 5 mL | 20 |
| 1 | 10 mL | 10 |
Note: The 10 mL row (1 mg/mL) is more water than many vials hold; check your vial's capacity.
Math only, not medical advice. This page converts numbers; it does not recommend any compound or amount.
Draw to
5 units
= 0.05 mL · concentration 5 mg/mL (5000 mcg/mL) · 40 draws per vial
Concentration = 10 mg ÷ 2 mL = 5 mg/mL Volume = 250 mcg ÷ 5000 mcg/mL = 0.05 mL Units = 0.05 mL × 100 (U-100) = 5 units
Math only, not medical advice. Verify every number yourself.