Peptide calculator
Work out exactly how many units to draw up in a U-100 syringe based on your reconstitution.
Enter your values
Fill in the amount of peptide, how much BAC water you've added, and your desired dose.
Result
Units to draw up
20.0 U
Volume
0.20 ml
Concentration
5.0 mg/ml
Units per mg
20 U/mg
The formula is: (desired dose mg ÷ (peptide mg ÷ BAC water ml)) × 100 = units. U-100 means 100 units equals 1 ml.
Visual U-100 syringe
The blue marker shows how far up the syringe you should draw the solution.
U-100 · 1 ml = 100 units
1. Reconstitute
Add sterile BAC water to the vial of peptide. Gently roll between your hands until the powder has dissolved.
2. Calculate
Enter the amount of peptide and water above. The calculator works out the concentration and the volume you need.
3. Draw up
Use a U-100 insulin syringe and draw up exactly the number of units the calculator shows.
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See our rangePeptide calculator for reconstitution
A peptide calculator can be used for mathematical calculations of concentration and volume after reconstitution. By entering the amount of peptide and the amount of liquid, the tool can calculate the resulting concentration and related volume values — without you having to calculate by hand.
How the peptide calculator works
Enter the amount of peptide and liquid
Fill in how many milligrams of peptide the vial contains and how much BAC water (or other liquid) you added during reconstitution.
Calculate concentration and volume
The calculator divides the amount of peptide by the amount of liquid to work out the concentration (mg/ml), then converts your desired dose into a volume based on that concentration.
Understand the result
The result fields show how many units you need to draw up in a U-100 syringe, the corresponding volume in ml, the calculated concentration, and how many units each milligram corresponds to.
Peptide concentration and reconstitution
What does mg/ml mean?
mg/ml indicates how many milligrams of peptide are present per milliliter of liquid after reconstitution. That's the concentration itself — the same amount of peptide mixed with less liquid gives a higher mg/ml value.
What is reconstitution?
Reconstitution is the process of dissolving a powdered peptide by adding a liquid, usually bacteriostatic water (BAC water), until it forms a ready-to-use solution.
How is concentration calculated?
Concentration is calculated as the amount of peptide (mg) divided by the amount of liquid (ml). For example, 5 mg of peptide mixed with 1 ml of liquid gives a concentration of 5 mg/ml.
U-100 syringe and units
What does U-100 mean?
U-100 is a standard graduation for insulin syringes where 100 units always equals exactly 1 ml. This makes it possible to measure small volumes precisely in units instead of milliliters.
How does the U-100 graduation work?
The scale on a U-100 syringe is divided into 100 units per milliliter. The number of units you draw up therefore corresponds to an exact fraction of 1 ml, based on the solution's concentration and the desired amount.
Frequently asked questions about the peptide calculator
What is a peptide calculator?
A peptide calculator is a mathematical tool that works out concentration, volume and number of units based on how much peptide and liquid you mix. It doesn't replace manual checking, but it makes the calculation faster and less error-prone.
What does reconstitution mean?
Reconstitution means adding a liquid (such as BAC water) to a powdered peptide so it dissolves into a ready-to-use solution. The amount of liquid used determines the solution's concentration.
What does mg/ml mean?
mg/ml (milligrams per milliliter) is a measure of concentration — how many milligrams of peptide are present in each milliliter of liquid after reconstitution. The less liquid relative to the amount of peptide, the higher the concentration.
What does U-100 mean?
U-100 is a standard graduation on insulin syringes where 100 units equals exactly 1 ml of liquid. The graduation makes it possible to measure small volumes precisely by number of units instead of milliliters.
How is concentration calculated?
Concentration is calculated by dividing the amount of peptide (mg) by the amount of liquid added (ml). For example, if you mix 5 mg of peptide with 1 ml of liquid, the concentration is 5 mg/ml.
Which values do I need to enter?
You enter the amount of peptide in the vial (mg), how much liquid you've added (ml) and your desired dose (mg). The calculator then automatically works out concentration, volume and number of units.
Related resources
Explore our full range of peptides, see bacteriostatic water (BAC water) for reconstitution, or a U-100 insulin syringe to draw up the solution.