For research and educational purposes only. Peptides are not approved for human use unless specifically indicated. Read full disclaimer.
PeptideHub

mg to mL Calculator for Peptide Reconstitution

Convert milligrams (mg) to millilitres (mL) for any reconstituted peptide solution. This conversion requires knowing the concentration — enter your vial size, diluent volume, and target dose to get the precise draw volume in mL and syringe units.

Common research range for BPC-157: 250–500 mcg, 2× daily, subcutaneous. Cycle: 4 weeks on / 2 off.

Educational use only. This calculator performs unit math on the values you provide and is not a substitute for medical advice. Verify every calculation independently.

Result

Concentration
2500 mcg / mL
Per syringe unit
25.00 mcg / unit
Draw to this mark
15.0 units (0.15 mL)
Dose, all units
375 mcg · 0.375 mg
Doses per vial
13.3 doses
Days per vial
6.7 days
Vials needed for 4-week cycle
5 vials

Numbers are computed from your inputs. Verify all calculations independently. Educational use only.

How to Use This Calculator

  1. Determine your peptide dose in mg or mcg: Identify the dose from your research protocol. Convert to mg if needed: mcg ÷ 1,000 = mg.
  2. Calculate or enter your solution concentration: Enter the concentration in mg/mL (or mcg/mL). Compute it as: vial mass ÷ diluent volume.
  3. Calculate volume: The calculator divides dose by concentration: Volume (mL) = dose (mg) ÷ concentration (mg/mL).
  4. Convert mL to syringe units: Multiply the mL result by 100 (for U-100) or 40 (for U-40) to get the number of syringe units to draw.
  5. Verify the draw volume is readable: Confirm the result is a practical draw volume (at least 2–3 units on the syringe scale). If not, adjust your reconstitution concentration.

Example Calculation

A researcher wants to draw 0.5 mg (500 mcg) of Ipamorelin from a vial reconstituted to 2.5 mg/mL (5 mg vial + 2 mL BAC water) using a U-100 syringe.

StepCalculationResult
Concentration5 mg ÷ 2 mL2.5 mg/mL
Volume for dose0.5 mg ÷ 2.5 mg/mL0.20 mL
U-100 units0.20 × 10020 units
U-40 units0.20 × 408 units

mg to mL Reference Table

Draw volumes (mL) for common doses at three typical reconstitution concentrations:

Dose@ 1 mg/mL@ 2.5 mg/mL@ 5 mg/mL
0.1 mg (100 mcg)0.10 mL / 10u0.04 mL / 4u0.02 mL / 2u
0.25 mg (250 mcg)0.25 mL / 25u0.10 mL / 10u0.05 mL / 5u
0.5 mg (500 mcg)0.50 mL / 50u0.20 mL / 20u0.10 mL / 10u
1 mg (1,000 mcg)1.00 mL / 100u0.40 mL / 40u0.20 mL / 20u
2 mg (2,000 mcg)2.00 mL*0.80 mL / 80u0.40 mL / 40u

u = units on a U-100 insulin syringe. *Exceeds standard 1 mL syringe — split or use larger syringe.

Frequently asked questions

How do I convert mg to mL for a peptide solution?+

You cannot convert mg to mL without knowing the concentration. The formula is: volume (mL) = mass (mg) ÷ concentration (mg/mL). For example, if your reconstituted solution has a concentration of 2.5 mg/mL (2,500 mcg/mL) and you want 0.5 mg (500 mcg), you need 0.5 ÷ 2.5 = 0.2 mL.

Is 1 mg always equal to 1 mL?+

No. This is a common misconception. 1 mg = 1 mL only when the solution concentration is exactly 1 mg/mL. After reconstitution, peptide concentrations are much higher — typically 1,000 to 5,000 mcg/mL (1–5 mg/mL) — so 1 mg of peptide is only a fraction of a mL.

What is the formula for mg to mL conversion?+

Volume (mL) = Dose (mg) ÷ Concentration (mg/mL). Equivalently in mcg: Volume (mL) = Dose (mcg) ÷ Concentration (mcg/mL). Both give the same result — just ensure units match throughout.

How do I find my peptide concentration after reconstitution?+

Concentration = vial mass ÷ diluent volume. If you add 2 mL BAC water to a 5 mg peptide vial: concentration = 5 mg ÷ 2 mL = 2.5 mg/mL (or 2,500 mcg/mL). Use the BAC Water Calculator to compute this step.

Why is my dose volume less than 0.1 mL?+

Small draw volumes (e.g., 0.05 mL = 5 units on a U-100 syringe) are common when using high-concentration peptide solutions. If the volume is too small to read accurately, consider adding more BAC water to lower the concentration and increase the draw volume.

Can I use this calculator for any injectable compound?+

The mg-to-mL math applies to any solution where you know the concentration. However, this calculator is optimised for lyophilized peptide research use. For insulin or other IU-dosed compounds, use the IU Conversion Calculator.