How many mg is 12 units?

(12 divided by 100) times the concentration. At 5 mg/mL, 0.6 mg. At 10 mg/mL, 1.2 mg. At 2.5 mg/mL, 0.3 mg.

How many mg is 35 units?

At 5 mg/mL (10 mg in 2 mL), 1.75 mg. At 10 mg/mL, 3.5 mg. 35 units is 0.35 mL on a U-100 syringe, whatever the concentration.

How many mg is 20 units?

At 5 mg/mL, 1 mg. At 10 mg/mL, 2 mg. At 2.5 mg/mL, 0.5 mg. This is why "20 units" means nothing on its own; ask what the vial and water were.

How many units is 0.5 mL?

50 units on a U-100 insulin syringe (100 units per mL). On a U-40 syringe, 20 units. Check the scale printed on your barrel before trusting either number.

Units to mg calculator

The mark on the syringe, converted back into a dose. Units are volume, so the answer needs your vial strength and water volume; enter them and it is exact.

Tables checked 28 September 2026
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Free downloadThe Protocol Pack

25 printable pages: dosing cards for the twelve most-used compounds at three water volumes, titration planners, a vial log, and five pages on what to do when it has already gone wrong.

How units become milligrams

The syringe only knows volume. Each unit on a U-100 insulin syringe is 0.01 mL, so 20 units is 0.2 mL whatever is in it. To turn that into a dose you multiply by the concentration, which is the milligrams in the vial divided by the water you added. 20 units of a 5 mg/mL solution (10 mg in 2 mL) is 0.2 mL times 5 mg/mL, which is 1 mg.

dose in mg = (units ÷ 100) × concentration in mg/mL. For micrograms, multiply the answer by 1,000.

Units to mg at the common concentrations

Find the mark you drew to on the left, then the column that matches your vial and water.

Units drawn	Volume	2.5 mg/mL	5 mg/mL	10 mg/mL	15 mg/mL	20 mg/mL
5 units to mg	0.05 mL	0.125 mg	0.25 mg	0.5 mg	0.75 mg	1 mg
10 units to mg	0.1 mL	0.25 mg	0.5 mg	1 mg	1.5 mg	2 mg
12 units to mg	0.12 mL	0.3 mg	0.6 mg	1.2 mg	1.8 mg	2.4 mg
15 units to mg	0.15 mL	0.375 mg	0.75 mg	1.5 mg	2.25 mg	3 mg
20 units to mg	0.2 mL	0.5 mg	1 mg	2 mg	3 mg	4 mg
25 units to mg	0.25 mL	0.625 mg	1.25 mg	2.5 mg	3.75 mg	5 mg
30 units to mg	0.3 mL	0.75 mg	1.5 mg	3 mg	4.5 mg	6 mg
35 units to mg	0.35 mL	0.875 mg	1.75 mg	3.5 mg	5.25 mg	7 mg
40 units to mg	0.4 mL	1 mg	2 mg	4 mg	6 mg	8 mg
50 units to mg	0.5 mL	1.25 mg	2.5 mg	5 mg	7.5 mg	10 mg
60 units to mg	0.6 mL	1.5 mg	3 mg	6 mg	9 mg	12 mg
70 units to mg	0.7 mL	1.75 mg	3.5 mg	7 mg	10.5 mg	14 mg
80 units to mg	0.8 mL	2 mg	4 mg	8 mg	12 mg	16 mg
100 units to mg	1 mL	2.5 mg	5 mg	10 mg	15 mg	20 mg

2.5 mg/mL is a 5 mg vial in 2 mL; 5 mg/mL is 10 mg in 2 mL; 10 mg/mL is 10 mg in 1 mL, 20 mg in 2 mL or 30 mg in 3 mL; 15 mg/mL is 30 mg in 2 mL; 20 mg/mL is 20 mg in 1 mL or 60 mg in 3 mL. Any other setup: use the calculator above with your own numbers.

Units to mL

This part never changes. On a U-100 syringe: 5 units is 0.05 mL, 10 units is 0.1 mL, 20 units is 0.2 mL, 50 units is 0.5 mL and 100 units is 1 mL. On a U-40 syringe each unit is 0.025 mL, so 20 units is 0.5 mL; the syringe page explains how to tell them apart.

Common questions

How many mg is 12 units?: (12 divided by 100) times the concentration. At 5 mg/mL, 0.6 mg. At 10 mg/mL, 1.2 mg. At 2.5 mg/mL, 0.3 mg.
How many mg is 35 units?: At 5 mg/mL (10 mg in 2 mL), 1.75 mg. At 10 mg/mL, 3.5 mg. 35 units is 0.35 mL on a U-100 syringe, whatever the concentration.
How many mg is 20 units?: At 5 mg/mL, 1 mg. At 10 mg/mL, 2 mg. At 2.5 mg/mL, 0.5 mg. This is why "20 units" means nothing on its own; ask what the vial and water were.
How many units is 0.5 mL?: 50 units on a U-100 insulin syringe (100 units per mL). On a U-40 syringe, 20 units. Check the scale printed on your barrel before trusting either number.

MethodologyEvery formula and rounding rule, so you can check the maths Read a syringeU-100 vs U-40, and the 2.5x error Build a full protocolThe stack builder at Peptide Bureau, about two minutes

Common conversions

The same three-step maths, pre-filled for the doses people ask about most. Units on a U-100 insulin syringe, where 100 units is 1 mL.

mg to units calculator Any dose at any concentration, both directions, with the full reference tables
Units to mg calculator (this page)
1 mg to units The most-asked conversion, at every common setup
2 mg to units Retatrutide starting dose
2.5 mg to units Tirzepatide starting dose
5 mg to units Tirzepatide step two, MOTS-c, epitalon
10 mg to units Tirzepatide step four
12 mg to units Retatrutide top dose, tirzepatide 12.5 mg
15 mg to units Tirzepatide top dose

All calculators and charts

Weight management (GLP-1 family)

Retatrutide calculator Vial, water and weekly dose to syringe units
Tirzepatide calculator The 2.5 to 15 mg ladder, converted
Semaglutide calculator The 0.25 to 2.4 mg ladder, converted
Cagrilintide calculator Amylin analogue, 0.3 to 4.5 mg weekly

Growth hormone axis

HGH (somatropin) calculator IU vials to syringe units
Ipamorelin calculator mcg doses, in mL and units
CJC-1295 (no DAC) calculator No-DAC and DAC, mcg to units
CJC-1295 / Ipamorelin blend calculator The 5 mg + 5 mg blend, per component
Sermorelin calculator Nightly mcg doses to units
Tesamorelin calculator 1 to 2 mg daily, in units
Hexarelin calculator mcg doses to units
IGF-1 LR3 calculator Tens of mcg from very small vials
AOD-9604 calculator 300 mcg daily, in units
MOTS-c calculator 5 to 10 mg, two or three times a week

Repair, skin and blends

BPC-157 calculator mcg doses from a 5 or 10 mg vial
TB-500 calculator Loading and maintenance, in units
BPC-157 / TB-500 blend calculator The Wolverine stack, per component
GHK-Cu calculator 50 to 200 mg vials, mg doses
GLOW blend calculator The 70 mg blend, split per component
KLOW blend calculator The 80 mg blend, split per component

Other compounds

PT-141 calculator 0.5 to 2 mg, as needed
Melanotan II calculator mcg loading doses to units
NAD+ calculator 100 to 1,000 mg vials, 25 to 200 mg doses
Thymosin alpha-1 calculator 1.6 mg twice weekly, in units
Epitalon calculator Short courses of 5 to 10 mg
Kisspeptin-10 calculator mcg doses to units
Glutathione calculator Hundreds of mg, or a 200 mg/mL solution

Dosage charts and schedules

Peptide reconstitution chart Concentration for every vial and water combination
Peptide dosing chart Printable unit tables for every compound
Retatrutide titration schedule 2 to 12 mg in units, stage by stage
Tirzepatide titration schedule 2.5 to 15 mg in units, stage by stage
Semaglutide titration schedule 0.25 to 2.4 mg in units, stage by stage
KLOW dosage and frequency chart The 80 mg blend at 2, 3 and 4 mL, both phases
GLOW dosage chart The 70 mg blend, units to each peptide
Wolverine stack dosing chart BPC-157 + TB-500, blend and separate vials
MOTS-c dosage chart 5 and 10 mg vials at three water volumes
Tirzepatide reconstitution chart Every vial size, every water volume, the whole ladder
Retatrutide dosing chart 1 to 12 mg across 10, 20 and 30 mg vials
Tirzepatide units to mg chart Both directions, every vial and water volume
Semaglutide units to mg chart The dosage chart in units, both directions
NAD+ injection dosage chart Per day, per week and frequency, 100 to 1,000 mg vials
Tesamorelin dosage chart 2, 5 and 10 mg vials, 0.5 to 2 mg in units
BPC-157 dosage chart mcg doses from 5 and 10 mg vials, four water volumes
PT-141 dosage chart The 10 mg vial, 0.5 to 2 mg, with uses per vial
Sermorelin dosage chart Nightly mcg doses from 5, 10 and 15 mg vials
Printable dosing charts Four one-page charts to save, pin or print
Peptide storage chart How long powder and mixed vials last, fridge to freezer

Tools

Peptide calculator The general tool, any compound
Reconstitution calculator How much water to add, and why it matters
Bacteriostatic water calculator Pick a volume that lands where you can read it
How to read an insulin syringe U-100 vs U-40, and the 2.5x error
The Protocol Pack Free 25-page printable reference
mg to units calculator Both directions, any concentration, with the reference tables
1 mg to units on an insulin syringe The conversion table for every common concentration
Units to mg calculator (this page)
2 mg to units on an insulin syringe 2 mg at every common vial and water volume
2.5 mg to units on an insulin syringe 2.5 mg at every common vial and water volume
5 mg to units on an insulin syringe 5 mg at every common vial and water volume
10 mg to units on an insulin syringe 10 mg at every common vial and water volume
12 mg to units on an insulin syringe 12 mg at every common vial and water volume
15 mg to units on an insulin syringe 15 mg at every common vial and water volume
Methodology Every formula, assumption and rounding rule
About Peptulator Who publishes it, independence and contact
Embed the calculator One line of HTML, free, credit line only

Before you use these numbers This is a unit-conversion tool. It turns a vial strength and a water volume into a concentration, a draw volume and a syringe mark. It does not tell you what to take, whether to take it, or whether a compound is safe for you. Most compounds listed are sold for laboratory research and are not approved for human use. Nothing here is medical advice. Dosing decisions belong with a licensed clinician who knows your history. Always check the strength printed on your own vial rather than trusting a preset.