How to Use This Calculator
Enter the milligrams of TB-500 in the vial, then the bacteriostatic water added in mL. Enter the amount to draw in mcg and pick the syringe size, then click Calculate. The result shows the concentration, the draw in mL and units, and how many doses of that size the vial holds.
One Vial, One Peptide
This calculator is for a plain TB-500 vial that holds only TB-500. If your vial is a blend, for example BPC-157 with TB-500 or a KLOW mix, the draw has to be sized by the combined concentration, so use the BPC-157 and TB-500 Blend Calculator or the KLOW Blend Calculator instead.
Where This Fits Alongside Other Research Tools
The Peptide Reconstitution Calculator works out how much bacteriostatic water to add to reach a target concentration before you draw. The Peptide Dosage Calculator does the same mcg to units conversion for any single peptide at a known concentration. This page is the TB-500 version of that conversion, with the wording set for a single TB-500 vial.
TB-500 10 mg Vial: Draw Volume at Different Water Volumes
The table shows the math for a 10 mg TB-500 vial. The units column uses a 500 mcg draw only as a worked example. Change the numbers in the calculator above to match your own vial and draw.
| Bac water added | Concentration | mcg per mL | Units for 500 mcg |
|---|---|---|---|
| 1 mL | 10 mg/mL | 10,000 mcg | 5 units |
| 2 mL | 5 mg/mL | 5,000 mcg | 10 units |
| 3 mL | 3.33 mg/mL | 3,333 mcg | 15 units |
The number of doses in the vial does not change with the water volume. A 10 mg vial holds 10,000 mcg, so 500 mcg draws give 10,000 / 500 = 20 doses at any of these volumes. More water only makes each draw longer on the syringe. To convert a draw on its own, use the mg to units syringe calculator.
Who Should Use This
Researchers working with a single TB-500 vial who need the syringe draw for a given amount and the number of doses the vial holds.
What This Calculator Does
The TB-500 Calculator turns the milligrams of TB-500 in a vial, the bacteriostatic water added and an amount in mcg into the concentration, the draw in mL and units on a U-100 syringe, and the number of doses the vial holds.
Formula Used
Concentration (mg/mL) = TB-500 (mg) / BAC water (mL)Draw (mL) = Amount (mg) / ConcentrationUnits to draw = Draw (mL) x 100 (U-100 syringe)Doses per vial = FLOOR(TB-500 (mg) / Amount (mg))Example Calculation
Limitations
This is a unit-conversion tool, not guidance on what to use. It assumes the vial dissolves evenly and that the vial size on the label is accurate, and it ignores dead space and draw loss. Confirm the vial contents against the supplier label before entering them.
Frequently Asked Questions
How many units is 500 mcg of TB-500?
It depends on the concentration. In a 5 mg vial reconstituted with 2 mL of bacteriostatic water the concentration is 2.50 mg/mL, so 500 mcg is 0.200 mL, which is 20.0 units on a U-100 syringe. Change the vial size or the water volume and the units change with it.
How do I work out the concentration of a TB-500 vial?
Divide the milligrams of TB-500 in the vial by the millilitres of bacteriostatic water you added. A 5 mg vial with 2 mL of water is 2.50 mg/mL. A 10 mg vial with the same 2 mL is 5.00 mg/mL.
Can I use this for a BPC-157 and TB-500 blend?
No. A blend vial holds two peptides in one liquid, so the draw is sized by the combined concentration. Use the BPC-157 and TB-500 Blend Calculator for that vial.
Why is my draw less than one unit?
A concentrated vial can put a small amount below the smallest marking on a 1 mL syringe. Adding more bacteriostatic water lowers the concentration and makes the draw larger, and the Peptide Reconstitution Volume Optimizer shows which water volume puts the draw on a clear marking.
How do I reconstitute a 10 mg TB-500 vial?
Add bacteriostatic water to the vial, then divide the 10 mg by the mL of water to get mg per mL. For example, 10 mg in 2 mL is 5 mg per mL, or 5,000 mcg per mL. Divide the mcg you want to draw by 5,000 to get mL, then multiply by 100 for units. Enter your own vial mg and water in the calculator and it does these steps for you.
How many doses are in a 10 mg TB-500 vial?
Convert the vial to mcg (10 mg is 10,000 mcg) and divide by the mcg you draw each time. For example, 10,000 / 500 = 20 doses of 500 mcg. The count depends only on the vial size and the draw size, not on the water you add. This is arithmetic only, not a recommended amount.