Peptide Reconstitution Calculator
Enter your vial’s labeled concentration, or its drug amount and confirmed final solution volume, and your prescribed dose to calculate units on a U-100 insulin syringe. Ready-mixed liquid needs no added water.
Step 1
Your vial & dose
What’s in your vial?
Vial values are examples. Replace them with your product or pharmacy label values.
Example vial inputs — not mixing instructions
Use the final volume confirmed by your product instructions or pharmacist. It may differ from the diluent volume added. If the label gives mg/mL, choose “Label concentration”.
Step 2
Type the dose exactly as written on your prescription or label. We don’t suggest doses.
Step 3
Syringe size
Smaller barrels have finer marks, which makes small doses easier to read.
Live syringe preview · 100-unit
Draw to
—
Enter the dose on your prescription to see how many units to draw.
- Concentration
- 5 mg/mL
- Each unit contains
- 50 mcg
Quick reference
Units → dose at your concentration
5 mg/mL · 50 mcg per unit
Arithmetic examples only. These amounts are not suggested doses.
2 units
100 mcg
0.02 mL
5 units
250 mcg
0.05 mL
10 units
500 mcg
0.1 mL
15 units
750 mcg
0.15 mL
20 units
1 mg
0.2 mL
25 units
1.25 mg
0.25 mL
30 units
1.5 mg
0.3 mL
40 units
2 mg
0.4 mL
50 units
2.5 mg
0.5 mL
60 units
3 mg
0.6 mL
75 units
3.75 mg
0.75 mL
100 units
5 mg
1 mL
Explore by medication
Peptide dosage calculators
Tirzepatide
GIP / GLP-1 receptor agonist
Example vial inputs: 5 mg, 10 mg, 15 mg, 20 mg, 30 mg
Open calculator
FDA-approved (brand)Semaglutide
GLP-1 receptor agonist
Example vial inputs: 2 mg, 5 mg, 10 mg
Open calculator
InvestigationalRetatrutide
GIP / GLP-1 / glucagon receptor agonist
Example vial inputs: 5 mg, 10 mg, 20 mg
Open calculator
Not FDA-approvedBPC-157
Synthetic peptide
Example vial inputs: 5 mg, 10 mg
Open calculator
Not FDA-approvedTB-500
Synthetic thymosin β-4 fragment
Example vial inputs: 2 mg, 5 mg, 10 mg
Open calculator
Not FDA-approvedCJC-1295 / Ipamorelin
Growth-hormone secretagogue blend
Example vial inputs: 5 mg, 10 mg
Open calculator
FDA-approved (brand)Tesamorelin
Growth hormone–releasing hormone analog
Example vial inputs: 2 mg, 5 mg, 10 mg
Open calculator
Not FDA-approvedNAD+
Coenzyme (often sold alongside peptides)
Example vial inputs: 100 mg, 500 mg, 1000 mg
Open calculator
Before reconstitution
Five checks for a powder vial
For powder (freeze-dried) vials only. If your vial arrived as a liquid, it is already mixed — never add water to it; use the concentration on the label. Your product’s own instructions always take priority over these general steps.
- 01
Check the product
Confirm that you have a powder intended for preparation and the instructions for that exact product. Ask your pharmacist if anything is unclear.
- 02
Confirm the diluent
Use only the diluent and volume specified in those instructions. The calculator cannot determine whether a diluent or mixing volume is suitable.
- 03
Follow the instructions
Follow the product’s preparation method and the technique your pharmacist taught you. These checks are not a substitute for its Instructions for Use.
- 04
Verify concentration
Use the labeled concentration after preparation, or the total drug amount and final solution volume. The final volume may differ from the amount of diluent added.
- 05
Check storage & discard
Follow the product’s storage conditions and discard time. Some preparations require immediate use. Do not infer a storage period from the calculator.
Coming soon
Your dose, remembered.
Log injection days, see how much is left in your vial, and get a gentle reminder when the next dose is due.
Please read before injecting
Always confirm your dose, concentration and syringe markings with your prescriber or pharmacist. Small calculation errors can have serious consequences. This tool does math — it doesn’t tell you what dose to take.
Good to know
Frequently asked questions
What does “units” mean on an insulin syringe?
U-100 insulin syringes are marked in units of volume: 100 units = 1 mL, so 10 units = 0.1 mL. Units tell you how much liquid to draw, not how much medication — that depends on the concentration of your vial.
How much bacteriostatic water should I add?
Confirm the diluent and preparation volume in your product or pharmacy instructions. This calculator cannot judge whether a diluent, volume or preparation is suitable. For the calculation, use the labeled concentration or confirmed final solution volume; that may differ from the amount added. If your vial arrived as a liquid, don’t add water.
Which syringe size should I use?
1 mL syringes hold 100 units and are usually marked every 2 units. 0.5 mL (50 units) and 0.3 mL (30 units) syringes are marked every unit, which makes small doses easier to read accurately.
My dose is more than the syringe holds — what now?
The calculator flags this and shows how many syringe fills it would take. First double-check the dose unit (mcg vs mg) and the concentration. Then ask your pharmacist how the dose should be given — don’t change how you mix a vial without their advice.
How long does a reconstituted vial last?
It depends on the product. Some mixed vials keep in the fridge until a beyond-use date; others must be used immediately and the remainder discarded. Follow your pharmacy or product label, and don’t use a vial if the liquid looks cloudy or has particles.
Is this medical advice?
No. This is an educational calculator that converts the dose you enter into syringe units. Your prescriber or pharmacist decides your dose.