Simple conversion
One mg equals 1,000 mcg. The calculator uses mcg internally for dose math because many peptide doses are small enough that mcg is clearer.
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Peptide calculator tool
MG to MCG Calculator
Convert between mg and mcg while preparing peptide calculator values for vial and dose math.
Math support only
This page is for calculator math and education. It does not diagnose, prescribe, or replace product-label or prescriber instructions.Where it fits
Use mg for total vial amount and mcg for target dose when that matches the product label or pharmacy instructions.
Common mistake
Do not confuse mg, mcg, mL, and syringe marks. They answer different questions: amount, smaller amount, liquid volume, and syringe position.
Frequently asked questions
How many mcg are in 0.25 mg?
0.25 mg equals 250 mcg. Always check the decimal point before entering values into a calculator.
Is this a prescription or protocol?
No. PeptiCalc is a measurement calculator. It helps translate vial strength, BAC water, and a selected dose into syringe marks, but it does not prescribe treatment.
Can I edit the preloaded values?
Yes. Every value that opens in the calculator is editable, including vial amount, BAC water, syringe size, and dose.
Why do syringe marks matter?
Most U-100 insulin syringes show 100 marks per mL. The calculator converts the liquid dose into the mark to pull to on that syringe scale.