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Peptide Reconstitution Calculator
Enter your vial amount, final solution volume and target research amount to calculate concentration and measured volume.
Select Compound
Choose a preset or enter custom vial values
Editable presets · Custom amounts · mcg/mL, mL and U-100 units · Shareable results
How the reconstitution calculator works
- Enter the total vial amount in mg. Use the actual mass on the material documentation, or edit the compound preset.
- Enter your target research amount and solution volume. Select mg or mcg for the target amount. The volume input is in mL and is treated as final solution volume.
- Review the concentration and measured volume. The U-100 conversion is a volume scale; confirm the capacity and graduations of the device you use.
Concentration (mcg/mL) = vial amount (mg) × 1,000 ÷ solution volume (mL)
Measured volume (mL) = target amount (mcg) ÷ concentration (mcg/mL)
U-100 units = measured volume (mL) × 100
Complete portions = round down [vial amount (mcg) ÷ target amount (mcg)]
The portion count assumes no transfer loss. Adding more diluent lowers concentration and increases the volume needed for the same target amount.
Worked example: mg, mcg, mL and syringe units
For a hypothetical 10 mg sample in a final volume of 2 mL, with a user-selected target amount of 250 mcg:
- Concentration
- 5,000 mcg/mL
- Measured volume
- 0.05 mL
- U-100 scale
- 5 units
- Complete equal portions
- 40
These are arithmetic inputs, not a recommended amount for a compound. At a final volume of 3 mL, the same mass and target amount give 0.075 mL, or 7.5 U-100 units. The number of equal portions remains 40.
Peptide calculator FAQ
What does a peptide reconstitution calculator calculate?
It converts a total vial amount, solution volume and target research amount into concentration, measured volume and U-100 syringe units. It also calculates the number of complete equal portions in the vial. It does not choose a dose, solvent or experimental protocol.
How do I use this peptide calculator?
Choose a compound preset or Custom Compound and verify the total amount in milligrams. Enter your target research amount in mcg or mg and the solution volume in mL. Select Calculate Results to see concentration, volume and U-100 units. Presets are editable calculation examples, not recommended doses or preparation instructions.
How do I convert mg to mcg?
One milligram equals 1,000 micrograms: 5 mg is 5,000 mcg and 0.25 mg is 250 mcg. The vial input uses mg. The target-amount input supports mg or mcg, so confirm the selected unit before comparing your result.
How many U-100 syringe units are in 1 mL?
On the U-100 scale, 100 units equals 1 mL, 10 units equals 0.1 mL and 1 unit equals 0.01 mL. Syringe units describe volume on that scale, not peptide mass or biological activity. A 30-unit or 50-unit U-100 syringe uses the same scale but holds a smaller maximum volume. Other syringe scales require a different conversion.
Does solution volume mean water added or final volume?
The calculation treats the entered mL as the final solution volume. Using the amount of diluent added assumes that dissolving the material does not meaningfully change the final volume. Use a verified final volume when that assumption is unsuitable for your laboratory calculation.
Can I use this as a bacteriostatic water calculator?
You can compare how a chosen solution volume changes concentration and the measured amount. The calculator does not establish whether bacteriostatic water or another solvent is compatible with a particular material. Follow the product documentation and your validated laboratory method for solvent, storage and handling.
Can I calculate BPC-157 or other custom vial amounts?
Yes. Use an editable compound preset or Custom Compound and enter the actual total mass and solution volume. Verify the material and its form first: powders, prepared solutions and tablets are not interchangeable. The calculation does not establish that a product can or should be reconstituted.
How should I interpret a fractional syringe-unit result?
A calculated result such as 7.5 U-100 units equals 0.075 mL. Rounding it to a whole marking changes the represented amount. Display precision is not a guarantee of measuring accuracy; check the graduations, capacity and precision of your measuring device.
Is the peptide calculator free, and can I share a calculation?
The calculator is free to use without signing up. Its share-link control can include the entered calculation values in a URL. An account is needed only for account features such as saving a compound to your tracker.
Continue your research
For more on the calculation, read the peptide reconstitution math guide. For a walkthrough of the interface, see how to use the Blackwell calculator.
When sourcing materials, browse research peptides and laboratory compounds and check batch certificates of analysis. Review the bacteriostatic water specifications when your validated method calls for that diluent.