For laboratory research use only. Not for human consumption. Not for clinical or therapeutic use. Not evaluated by the FDA.
For laboratory research use only. Not for human consumption. Not for clinical or therapeutic use. Not evaluated by the FDA.
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Bundle complementary compounds together — priced below buying each separately.
Research Tools
This free peptide calculator turns vial strength and bacteriostatic water into the numbers you actually need — the stock concentration in mg/mL and mcg/mL, and the exact insulin-syringe units to draw for a target amount. Pick a peptide to auto-fill its vial size, set your target in mcg or mg, choose a syringe, and read the draw. It doubles as a reconstitution, dilution, and bacteriostatic water calculator for lyophilized research peptides.
Reconstitution
Syringe
U-100 · 100 units = 1 mLDraw to
5units
= 0.05 mL on the 1.0 mL syringe
At 5 mg/mL, draw 0.05 mL to measure 250 mcg.
Add it to your own site or lab notes. It stays free, always shows the latest catalog, and links back here.
<iframe src="https://ascensionlabsresearch.com/tools/reconstitution-calculator/embed" title="Peptide Reconstitution Calculator by Ascension Labs" width="100%" height="900" loading="lazy" style="border:0;max-width:900px;border-radius:16px"></iframe>There is no single correct volume — the amount of bacteriostatic water you add sets the concentration of the stock solution. More water gives a lower concentration (easier to measure small amounts precisely); less water gives a higher concentration. A practical approach is to choose a volume that makes your target amount land on an easy-to-read mark on the syringe. Enter the vial mass and your water volume in the calculator to see the resulting mg/mL and mcg/mL instantly.
Concentration equals the mass of peptide divided by the volume of solvent. For example, 5 mg of peptide reconstituted in 2 mL of bacteriostatic water gives 2.5 mg/mL, which is the same as 2,500 mcg/mL. The calculator computes this automatically the moment you enter the vial mass and water volume.
On a U-100 insulin syringe, 100 units equals 1 mL. To find the units for a target amount, divide the target (in mcg) by the concentration (in mcg/mL) to get the volume in mL, then multiply by 100. The calculator does this for you and highlights the exact unit mark to draw to on your selected syringe size.
U-100 insulin syringes commonly come in 0.3 mL (30-unit), 0.5 mL (50-unit) and 1 mL (100-unit) sizes. Choosing the smallest syringe your measured volume fits in gives the most precise, readable measurement. The calculator lets you pick the size and warns you if the required volume exceeds it.
Yes. Use the mcg / mg toggle next to the target field — the value converts automatically. 1 mg equals 1,000 mcg, so 0.25 mg is 250 mcg.
Bring the lyophilized vial and the bacteriostatic water to room temperature, draw the calculated volume of water into a syringe, and add it slowly down the inside wall of the vial rather than spraying it onto the powder. Let the powder dissolve on its own — swirl gently if needed, but do not shake, which can cause aggregation. Store the solution refrigerated in single-use aliquots to limit freeze-thaw cycling.
Yes — it is completely free with no signup. It stays in sync with the live Ascension Labs catalog, so you can select a specific peptide to pre-fill its vial size, or type any vial mass and solvent volume manually.
Reconstitution math is a single division. The concentration of a stock solution equals the mass of peptide divided by the volume of solvent. For example, 5 mg of peptide dissolved in 2 mL of bacteriostatic water gives 2.5 mg/mL, or 2,500 mcg/mL. To find the volume that contains a target amount, divide the target (in mcg) by the concentration (in mcg/mL). On a U-100 insulin syringe, 100 units = 1 mL, so the volume in mL × 100 gives the unit mark to draw to.
This calculator is a laboratory tool for preparing and measuring research stock solutions and is provided for informational purposes for qualified researchers. All compounds sold by Ascension Labs are for laboratory research use only; not for human or veterinary use. Nothing here is dosing, administration, or medical guidance.