Research instrument

Reconstitution calculator

Compute peptide concentration, draw volume, and syringe units for any vial size, bacteriostatic-water volume, and target dose. Eight common peptides pre-set; switch syringes to match your supply.

Vial size
0.1–100 mg
Syringes
U-100 / U-40 / tuberculin
Use
Research reference only

Inputs

Peptide in vialmg

Bacteriostatic watermL

Desired dosemcg

Syringe

Outputs

Concentration

2.50mg/mL

2.50 mg/mL

Draw volume

0.10mL

≈ 10.0 IU

0U-100 insulin (1 mL) · 1 mL total1 mL

How the math works

01Compute concentration — divide the total peptide mass in the vial by the volume of bacteriostatic water you added.5 mg ÷ 2 mL = 2.50 mg/mL
02Compute draw volume — divide your target dose by the concentration. The result is the volume to draw.250 mcg ÷ 2.50 mg/mL = 0.10 mL
03Translate to syringe units — divide the draw volume by the syringe's volume-per-unit increment.0.10 mL ÷ 0.01 mL/unit = 10.0 IU

≈ 20 doses from the full vial at this dose size.

Practical notes

Reconstituted peptides keep at 2–8 °C for ~28 days. Lyophilized (dry) vials are stable at room temperature for short transit windows but should be refrigerated for long-term storage.
Use sterile technique: wipe rubber stoppers with alcohol before each draw. Inject bacteriostatic water down the vial wall slowly, swirl gently — never shake.
Reagents on this site are sold strictly for laboratory research. The calculator assumes a properly reconstituted vial and clean draw technique.

This tool is provided as a research-protocol reference only. It does not constitute medical advice, and the values shown should never be applied to humans or animals outside a properly governed research setting. Consult primary literature for compound-specific PK and study-design considerations.

How to use it

Four steps from vial to syringe

Read the steps once, then keep the calculator open as you reconstitute. The math is intentionally explicit so you can sanity-check it.

01
Pick a preset on the left, or enter your vial's labeled peptide mass and the volume of bacteriostatic water you plan to add. The concentration updates live.
02
Enter the dose you intend to draw (in mcg). The draw volume updates immediately, in both millilitres and syringe-unit ticks.
03
Choose the syringe you actually have in hand — U-100 (most common, 100 units/mL) or U-40 / tuberculin if you stock those. The unit count adjusts to match.
04
Confirm against the schematic. The black tick on the fill bar shows roughly where the plunger will sit on a real syringe — useful for verifying you're not at the absolute extremes of capacity.

Glossary Research Shop catalog