SS-31 Calculator
Enter your SS-31 vial size, the water you add and your dose to get the units to draw on a U-100 syringe. The units chart and water table below cover 10, 50 mg vials.
How many units is each SS-31 dose?
Units on a U-100 insulin syringe for common amounts, with 2 mL of bacteriostatic water in the vial. With a different water amount, use the calculator above.
| Dose (mg) | 10 mg vial + 2 mL | 50 mg vial + 2 mL |
|---|---|---|
| 1 mg | 20 units 0.2 mL | 4 units 0.04 mL |
| 2.5 mg | 50 units 0.5 mL | 10 units 0.1 mL |
| 5 mg | 100 units 1 mL | 20 units 0.2 mL |
| 10 mg | 200 units* 2 mL | 40 units 0.4 mL |
* More than one 1 mL syringe. Use more water or split the draw.
How much bac water for SS-31?
Water only changes how much liquid each dose takes up, not how much SS-31 is in it. To land a 5 mg dose on a round number of units, add:
| Vial | So 5 mg = 10 units | So 5 mg = 20 units |
|---|---|---|
| 10 mg | 0.2 mL | 0.4 mL |
| 50 mg | 1 mL | 2 mL |
How do you reconstitute SS-31?
- Concentration: 10 mg ÷ 2 mL = 5 mg/mL (50 mcg per unit).
- Volume to draw: 5 mg ÷ 5 mg/mL = 1 mL.
- Syringe units: 1 mL × 100 = 100 units on a U-100 syringe.
Example numbers only. They come from the default vial, water and amount above, not a recommendation.
What else do people ask about SS-31?
How many units is 5 mg of SS-31?
It depends on how much water is in the vial. With a 10 mg vial and 2 mL of water, 5 mg is 100 units (1 mL) on a U-100 syringe. Change the vial or water amount above to see your number.
How much bacteriostatic water do I add to a SS-31 vial?
There's no single right amount. More water makes each unit weaker and the draw bigger, which is easier to measure. Less water makes the draw smaller. Many people pick an amount that puts their dose on a round number of units. The "Units → water to add" tab and the table above work this out.
How many doses are in a 10 mg SS-31 vial?
At 5 mg per dose, a 10 mg vial holds 2 doses. The amount of water doesn't change this.
Does this page recommend a SS-31 dose?
No. This page only converts amounts you enter into syringe units. Ask a licensed clinician about whether and how to use SS-31.