What it converts
Convert between mg and mcg, optionally calculate IU with a label factor, and translate the dose into mL and syringe units.
Tools
Peptide Unit Converter
Convert peptide amounts between mg, mcg, optional IU and syringe units using vial strength, BAC water and syringe scale.
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Unit conversion calculator
Convert mass units, optional IU and syringe draw from the same reconstituted vial setup.
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Best for
Checking dose unit math, comparing concentration after reconstitution and converting microgram amounts into syringe marks.
Common searches
Peptide unit converter, mcg to mg peptide calculator, peptide IU converter and peptide units calculator.
mg to mcg quick table
Milligrams and micrograms are mass units. This table is pure unit conversion, independent of vial concentration.
| mg | mcg | Decimal mg |
|---|---|---|
| 0.05 mg | 50 mcg | 0.05 mg |
| 0.1 mg | 100 mcg | 0.1 mg |
| 0.25 mg | 250 mcg | 0.25 mg |
| 0.5 mg | 500 mcg | 0.5 mg |
| 1 mg | 1000 mcg | 1 mg |
mcg to units examples
Syringe units require concentration. These examples assume a U-100 syringe and a vial mixed to 2.5 mg/mL.
| Amount | In mg | Draw volume | U-100 units |
|---|---|---|---|
| 100 mcg | 0.1 mg | 0.04 mL | 4 units |
| 250 mcg | 0.25 mg | 0.1 mL | 10 units |
| 500 mcg | 0.5 mg | 0.2 mL | 20 units |
| 1000 mcg | 1 mg | 0.4 mL | 40 units |
About IU conversions
Milligrams and micrograms are mass units. IU is a biological activity unit and is not universal across peptides. Use the IU factor only when it appears on a specific product label or is provided by a clinician.
Unit converter FAQ
How many mcg are in 1 mg?
1 mg equals 1000 mcg. To convert mg to mcg, multiply by 1000. To convert mcg to mg, divide by 1000.
How do you convert mcg to syringe units?
First convert mcg to mg, then divide by the vial concentration in mg/mL to get mL. On a U-100 syringe, multiply mL by 100 to get units.
Are IU and mg interchangeable?
No. IU is a biological activity unit and is product-specific. Milligrams and micrograms are mass units. Only use an IU factor when it appears on the exact product label or is provided by a clinician.
What is the difference between units and mcg?
mcg measures mass. Syringe units measure volume on a specific syringe scale. A unit mark only tells you how much liquid to draw, not how many micrograms are in that liquid.
Use with other peptide calculators
Pair unit conversion with reconstitution math and accumulation estimates for a fuller view of peptide calculations.
Peptide reconstitution calculatorCalculate concentration, draw volume and syringe units from vial strength and BAC water.Open toolPeptide accumulation calculatorModel repeated dosing schedules with half-life, interval, peak and trough estimates.Open toolPeptide chemistry calculatorAnalyze sequence length, molecular weight, composition, charge, hydropathy and notation.Open tool
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