mcg to mg Calculator — Convert Micrograms to Milligrams Instantly
Convert micrograms (mcg) to milligrams (mg) instantly. Essential for calculating GLP-1 doses like Semaglutide, Tirzepatide and Retatrutide, as well as all research peptides. See the complete mcg to mg conversion guide for full worked examples.
To convert mcg to mg, divide by 1000. So 500mcg = 0.5mg.
To convert mg to mcg, multiply by 1000. So 2.4mg = 2400mcg.
1 mg = 1,000 mcg | 1 mcg = 0.001 mg
Common peptide doses — click to convert:
mcg to mg Conversion Table
Every row is the same operation: divide by 1000. To go from mg back to mcg, multiply by 1000.
| mcg | mg |
|---|---|
| 1 mcg | 0.001 mg |
| 10 mcg | 0.01 mg |
| 25 mcg | 0.025 mg |
| 50 mcg | 0.05 mg |
| 100 mcg | 0.1 mg |
| 200 mcg | 0.2 mg |
| 250 mcg | 0.25 mg |
| 300 mcg | 0.3 mg |
| 500 mcg | 0.5 mg |
| 750 mcg | 0.75 mg |
| 1,000 mcg | 1 mg |
| 2,000 mcg | 2 mg |
| 2,500 mcg | 2.5 mg |
| 5,000 mcg | 5 mg |
| 10,000 mcg | 10 mg |
GLP-1 Medication Dose Converter
Common GLP-1 doses converted between mg and mcg. Use the semaglutide reconstitution calculator or tirzepatide reconstitution calculator to get injection volumes.
| Dose (mg) | Dose (mcg) | Medication |
|---|---|---|
| 0.25mg | 250mcg | Semaglutide starting dose |
| 0.5mg | 500mcg | Semaglutide dose 2 |
| 1mg | 1000mcg | Semaglutide dose 3 |
| 1.7mg | 1700mcg | Semaglutide dose 4 |
| 2.4mg | 2400mcg | Semaglutide max / Cagrilintide |
| 2.5mg | 2500mcg | Tirzepatide starting dose |
| 5mg | 5000mcg | Tirzepatide dose 2 |
| 7.5mg | 7500mcg | Tirzepatide dose 3 |
| 10mg | 10000mcg | Tirzepatide dose 4 |
| 12.5mg | 12500mcg | Tirzepatide dose 5 |
| 15mg | 15000mcg | Tirzepatide max dose |
Common Peptide mcg to mg Conversions
Common peptide dose conversions with typical use cases. Use the mg to ml calculator to find injection volumes for any concentration.
| mcg | mg | Common peptide dose |
|---|---|---|
| 100mcg | 0.1mg | Low dose peptides |
| 200mcg | 0.2mg | Sermorelin, Ipamorelin |
| 250mcg | 0.25mg | BPC-157 standard dose |
| 300mcg | 0.3mg | CJC-1295 dose |
| 500mcg | 0.5mg | PT-141, AOD-9604 |
| 1000mcg | 1mg | TB-500 low dose |
| 2000mcg | 2mg | TB-500 standard dose |
| 2400mcg | 2.4mg | Cagrilintide standard |
| 5000mcg | 5mg | MOTS-C, Epithalon |
Worked Examples: mcg to mg and mg to mcg
Both directions use one operation. mcg to mg: divide by 1000 (mg = mcg ÷ 1000). mg to mcg: multiply by 1000 (mcg = mg × 1000).
| Conversion | Result | Working |
|---|---|---|
| 250 mcg to mg | 0.25 mg | 250 ÷ 1000 |
| 2,000 mcg to mg | 2 mg | 2,000 ÷ 1000 |
| 2.4 mg to mcg | 2,400 mcg | 2.4 × 1000 |
| 1.7 mg to mcg | 1,700 mcg | 1.7 × 1000 |
- mcg to mg: divide by 1000 — 1 mcg = 0.001 mg
- mg to mcg: multiply by 1000 — 1 mg = 1000 mcg
- Decimal shortcut: move the point three places — left for mcg to mg, right for mg to mcg
The bidirectional calculator at the top of this page runs the same arithmetic for any value — type into either field and the other updates instantly.
Why the Conversion Matters for Peptides
Peptide vials are labeled by their total contents in milligrams — a 2 mg vial, a 5 mg vial, a 10 mg vial. Doses, on the other hand, are usually discussed in micrograms. A vial labeled 5 mg holds 5,000 mcg in total, so 250 mcg is one twentieth of the vial: 0.25 mg. Same amount of material, two units, a factor of 1,000 between them.
The mcg to mg conversion is the first step in turning a microgram dose into something measurable. Once the dose is in milligrams, dividing by the solution's concentration in mg/ml gives the volume to draw. That second step is what the reconstitution calculator handles; this page handles the first.
The two common errors are reading 0.25 mg as 250 mg, or reading an amount written in mcg as mg — a factor of 1,000 in either direction. Check the unit on every label (mcg, µg and ug all name micrograms) and convert on paper before measuring. More worked conversions are in the mcg to mg conversion guide.