TB-500 Reconstitution & Dosage Calculator
This TB-500 calculator converts the vial strength and water volume you enter into concentration, volume, and U-100 syringe markings. The existing widget includes a 5 mg preset; the reference also covers 10 mg vials and 1, 2, or 3 mL numerical volumes. Verify the actual label and preparation instructions rather than treating a preset as a recommendation. These are hypothetical calculations, not suggested amounts, schedules, or treatment guidance.
Interactive calculator
The calculator and its inputs load in your browser. The reference below is available without JavaScript.
How to use the peptide calculator
- Enter the vial amount in mg, using the label rather than assuming that every vial matches the preset.
- Enter the water volume in mL. Changing this input changes concentration without changing the total mass.
- Enter the desired amount and choose mg or mcg. Convert mcg to mg by dividing by 1,000.
- Read the calculated volume and U-100 units. Check all entered quantities before using the result as an arithmetic reference.
The reconstitution formula
Concentration (mg/mL) = mg in vial ÷ mL of water.
Volume (mL) = desired amount (mg) ÷ concentration (mg/mL).
U-100 syringe units = volume (mL) × 100. Convert mcg to mg by dividing by 1,000 before calculating.
Worked examples
5 mg vial with 2 mL water
5 ÷ 2 = 2.5 mg/mL. For an arbitrary example amount of 0.25 mg (250 mcg), volume = 0.25 ÷ 2.5 = 0.1 mL. On a U-100 syringe, 0.1 × 100 = 10 units.
10 mg vial with 2 mL water
10 ÷ 2 = 5 mg/mL. A hypothetical 0.5 mg amount corresponds to 0.5 ÷ 5 = 0.1 mL, or 10 U-100 units. The same syringe volume contains twice the mass in the preceding concentration.
5 mg vial with 1 mL water
5 ÷ 1 = 5 mg/mL. A hypothetical 0.2 mg amount corresponds to 0.2 ÷ 5 = 0.04 mL. Multiply by 100 to obtain 4 U-100 units; this is a volume conversion, not a recommended amount.
Concentration reference table
Pure-math reference: 10 U-100 syringe units = 0.1 mL. Amounts are not dosing recommendations.
| Vial (mg) | Water (mL) | Concentration (mg/mL) | Amount per 10 U-100 units (mcg) |
|---|---|---|---|
| 5 | 1 | 5 | 500 |
| 5 | 2 | 2.5 | 250 |
| 5 | 3 | 1.667 | 166.667 |
| 10 | 1 | 10 | 1000 |
| 10 | 2 | 5 | 500 |
| 10 | 3 | 3.333 | 333.333 |
Frequently asked questions
How many units is 0.1 mL?
On a U-100 syringe, 0.1 mL × 100 = 10 units. These markings describe volume, not milligrams or a substance's biological activity.
How much bacteriostatic water should I add?
This calculator compares the concentration produced by the water volume you enter; it does not prescribe a volume. Use the product's preparation instructions and vial capacity. Doubling the entered water volume halves the calculated concentration.
How do I convert micrograms to milligrams?
1,000 mcg equals 1 mg. Divide a microgram amount by 1,000: for example, 250 mcg is 0.25 mg. Use matching mass units when dividing by concentration.
Does it work with U-40 or U-50 syringes?
The displayed syringe-unit results use U-100 calibration only. For the same volume, U-40 markings equal mL × 40 and U-50 markings equal mL × 50. A 0.5 mL, 50-unit U-100 syringe is not a U-50 syringe.
Are the examples dosing recommendations?
No. Every example and table entry is hypothetical arithmetic. The calculator converts quantities you supply; it does not determine an appropriate amount, frequency, route, or treatment.
Why do rounded results differ slightly?
Some concentrations repeat indefinitely, such as 5 ÷ 3 mg/mL. Retain full precision during division and round only the final displayed result. The table rounds repeating values for readability.