Peptide Reconstitution Calculator - assumptions and limitations

Assumptions

• Pure arithmetic only

  This calculator performs unit conversions and concentration math. It does not model peptide pharmacokinetics, stability, or protocol guidance.

• Powder displacement

  Powder displacement defaults to 0 mL. For most peptides this is a small correction; enable it under Advanced if your peptide ships with a known displacement value.

• U-100 syringe estimate

  Insulin-syringe units use the standard factor of 100 units/mL (1 unit = 0.01 mL). Confirm against your specific syringe markings before drawing.

• Doses per vial rounds down

  Doses per vial floors to whole doses based on the peptide amount and target dose. Days of supply uses full doses only; partial-dose remainder is not counted.

• BAC water labelling and storage

  Always label reconstituted vials with concentration, date, and storage location. This tool does not determine beyond-use dates.

Formulas used

Each output is derived from one of the formulas below. They run client-side, so what you see in the calculator is what the math actually does.

1. 1. Final volume (mL)

   final_volume_mL = bac_water_mL + displacement_mL

2. 2. Concentration (mg/mL)

   concentration_mg_per_mL = peptide_vial_mg / final_volume_mL

3. 3. Draw per dose (mL)

   draw_mL = target_dose_mg / concentration_mg_per_mL

4. 4. U-100 syringe units (estimate)

   units = draw_mL * 100

5. 5. Reverse mode: BAC water needed

   bac_water_mL = (peptide_vial_mg * desired_draw_mL / target_dose_mg) - displacement_mL

6. 6. Doses per vial

   doses_per_vial = floor(peptide_vial_mg / target_dose_mg)

7. 7. Days of supply

   days_of_supply = doses_per_vial * interval_days

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