Reconstitution maths, made easy.
Tell us what's in the vial and how much diluent you add. We'll work out the concentration, the volume and the insulin units for you in seconds.
- U-100 syringes
- mcg or mg
- 0.3, 0.5 or 1 ml
- aConcentrationvial mg × 1,000 ÷ diluent ml = mcg per ml
- bVolumeamount per draw ÷ concentration = ml
- cUnitsml × 100 on a U-100 syringe
Your calculation
Results update as you type.
For laboratory research calculations only, not medical advice. We only do the maths.
Four simple steps
Check the vial
Type the amount on the label, in mg.
Add the diluent
Enter the bacteriostatic water, in ml.
Set an amount
Enter the amount per draw, in mcg or mg.
Read the scale
Choose your syringe and read off the units.
What is reconstitution?
Many research peptides arrive as a dry, freeze-dried powder. Reconstitution simply means dissolving that powder in a diluent – usually bacteriostatic water, which is sterile water with 0.9% benzyl alcohol as a preservative.
The diluent never changes how much peptide is in the vial. It only changes the strength: more diluent, weaker solution, bigger volume per draw.
Good questions
How many units are in 1 ml?
On a U-100 insulin syringe, 1 ml is 100 units. A 0.5 ml syringe holds 50 units and a 0.3 ml syringe holds 30. One unit is 0.01 ml.
What's the difference between mg and mcg?
1 mg is 1,000 mcg. Vials are usually labelled in mg; tap the mcg/mg switch and the calculator converts the number for you.
Does more diluent mean less peptide?
No – the amount of peptide stays the same. More diluent only makes the solution weaker, so the same amount takes up more volume.
What if it doesn't fit in my syringe?
You'll see a gentle warning and the syringe shows it's over the top. Pick a bigger syringe or split it into more than one draw.
Will it tell me how much to use?
No. The calculator only does the maths on the numbers you enter. It gives no dosing advice and suggests no amounts for any peptide. It's for laboratory research calculations only.