KIWI PEPS RECONSTITUTION CALCULATOR
Work out mixing ratios on the bench, not on paper. Punch in your vial size, BAC water volume and target dose and this tool returns the exact syringe units for research use.
For laboratory research use only, not for human or animal use. Standard insulin syringes read 100 units per 1 mL. Always double-check the maths yourself against your protocol — this tool gives an estimate from the numbers you enter and is a reference aid, not dosing advice.
1. What is the total volume of your syringe?
2. Select research compound quantity
3. How much diluent (BAC water) are you adding?
4. What is your desired dose?
Bench Reading
10 mg compound + 1 ml diluent = 10.000 mg/ml concentration
Dose
0.5 mg
Draw Syringe To
5.00 Units
(0.050 ml)
Syringe Visual Guide (1 ml capacity)
Your Vial Contains
20 doses
Concentration
10.000 mg/ml
How this calculator does the maths
Kiwi Peps built this tool to take the guesswork out of mixing a lyophilised vial on the bench. It first turns your vial mass and the bacteriostatic (BAC) water you add into a concentration in mg/mL. It then divides your target dose by that concentration to find the draw volume in mL, and converts that into units on a standard 1 mL / 100-unit insulin syringe so the number matches what you read off the barrel.
The same three-step formula applies to any lyophilised compound in the Kiwi Peps range — BPC-157, TB-500, Retatrutide, Tirzepatide, CJC-1295, Ipamorelin, Semaglutide, GHK-Cu and others. Adjust vial size, BAC water or dose and the syringe reading updates on the spot.
The reconstitution formula
- Concentration (mg/mL) = vial mg ÷ BAC water mL
- Volume to draw (mL) = target dose mg ÷ concentration mg/mL
- Insulin syringe units = volume to draw (mL) × 100
Calculator FAQ
What is a peptide calculator?
A peptide calculator converts a vial's peptide mass and the amount of bacteriostatic (BAC) water you add into a concentration (mg/mL) and tells you exactly how many insulin-syringe units equal your target dose.
How do I calculate peptide dosage?
Divide the peptide amount in the vial (mg) by the volume of BAC water added (mL) to get the concentration in mg/mL. Divide your target dose (mg) by that concentration to get the volume to draw in mL, then multiply by 100 to convert to units on a standard 1 mL insulin syringe.
How much BAC water should I use to reconstitute a peptide?
Most researchers use 1–3 mL of bacteriostatic water per vial. More water gives an easier-to-measure draw for small doses; less water concentrates the peptide for larger doses. Enter your vial size and water volume above to see the resulting concentration and units per dose.
How many units is 0.25 mg of a peptide?
It depends on concentration. If you reconstitute a 10 mg vial with 1 mL BAC water (10 mg/mL), 0.25 mg = 0.025 mL = 2.5 units on a 1 mL / 100-unit insulin syringe. Use the calculator above for your exact vial.
Does this peptide calculator work for BPC-157, Retatrutide and GHK-Cu?
Yes. The math is the same for any peptide supplied as a lyophilised powder — BPC-157, TB-500, Retatrutide, Tirzepatide, CJC-1295, Ipamorelin, GHK-Cu, Semaglutide and others. Just enter the vial mg and your target dose.
Is this calculator for human use?
No. Kiwi Peps tools and products are supplied strictly for in-vitro laboratory research in New Zealand. They are not for human or animal consumption, and this calculator is not dosing advice.
Related research tools & pages
Pair this calculator with the NZ-held stock in our catalogue, or check the analytical paperwork behind each batch in The Batch Book.
Shop Research Peptides
BPC-157, Retatrutide, Tirzepatide, GHK-Cu, CJC-1295 and more — packed and dispatched from New Zealand.
Research Catalogue
Reference notes for every peptide category, cross-linked with the matching Batch Book entries.
The Batch Book
Independent HPLC-MS certificates confirming the KP-99 Purity Standard for every batch we ship.
Research Blog
Reconstitution walkthroughs, compound overviews and storage guidance for NZ researchers.