Retatrutide calculator — & peptide reconstitution

Vialpeptide + amount

RetaTirzSemaBPC-157TB-500

5101520mg

Bacteriostatic waterdiluent added

123mL

Directionwhat you know

Dose → unitsUnits → dose

Dose you wanttarget

246912mg

Your syringeU-100 insulin

0.3 mL · 30u0.5 mL · 50u1 mL · 100u

Round tosyringe tick marks

exact½u1u2u

Draw to

80units

4 mg · 0.8 mL · 5 mg/mL · ≈ 2 doses left

This pulls 4 mg.

Save image Embed

Titration ladder — Retatrutide

Weeks	Dose	At 10 mg + 2 mL (5 mg/mL)
1–4	2 mg	40 units
5–8	4 mg	80 units
9–12	6 mg	120 units — needs a 1 mL syringe or thicker mix
13–16	9 mg	180 units — needs a 1 mL syringe or thicker mix
17+	12 mg	240 units — needs a 1 mL syringe or thicker mix

GLP-1 dose ranges differ — reta is not Mounjaro

Peptide	Start	Max	Steps
Retatrutide	1–2 mg	12 mg	2→4→6→9→12
Tirzepatide (Mounjaro)	2.5 mg	15 mg	2.5→5→7.5→10→12.5→15
Semaglutide (Ozempic)	0.25 mg	2.4 mg	0.25→0.5→1→1.7→2.4

Full head-to-head on Retatrutide vs Tirzepatide, and the complete protocol on the dosage guide.

Embed this calculator

The whole calculator lives in the URL. Pick a shape and preset, then drop it into an article, a product page, or a webview.

Shape

Article embedApp sectionFull page

Peptide

RetaTirzSemaBPC-157TB-500

Mode

DrawReconstituteReverseBlendSchedule

Preset vial

mg +mL

Your site (for attribution stats)

Lock inputs (reader can’t change)

vial + waternothingall

Embed snippet

<iframe src="https://glp3.wiki/calculator?embed=1&mode=draw&peptide=retatrutide&vial=10&water=2&lock=vial%2Cwater"
  width="100%" height="560" loading="lazy"
  style="border:1px solid #e7e7e3;border-radius:12px"></iframe>
<p>Powered by <a href="https://glp3.wiki/calculator?utm_source=embed&utm_medium=snippet">glp3.wiki</a></p>

Article embed · retatrutide · Draw · 10 mg + 2 mL, locked

Common questions

How much bacteriostatic water for a 10 mg retatrutide vial?

There is no single correct amount — it sets the concentration. 10 mg + 1 mL = 10 mg/mL; 10 mg + 2 mL = 5 mg/mL. More water gives a larger, easier-to-read draw for small doses. Set your vial and water above and the calculator shows the resulting concentration and units per dose.

How do I convert retatrutide mg to units on an insulin syringe?

Units = dose ÷ concentration × 100, where concentration = vial mg ÷ mL of water, on a U-100 syringe (100 units = 1 mL). Example: a 10 mg vial in 2 mL is 5 mg/mL, so a 4 mg dose = 4 ÷ 5 × 100 = 80 units.

On a 1 mL (100-unit) insulin syringe, is 0.5 mL up to the 50?

Yes. A 1 mL U-100 syringe is marked 0–100 units, so 0.5 mL is the 50-unit mark and 1 mL is 100 units. The calculator draws the fill line on your exact syringe so you can see where to pull to.

How many units is a 2 mg or 4 mg retatrutide dose?

It depends on your concentration. At 5 mg/mL (10 mg + 2 mL): 2 mg = 40 units, 4 mg = 80 units, 6 mg = 120 units. Change the vial or water above to recompute for your setup.

Sources: Jastreboff et al., NEJM 2023 · Rosenstock et al., Lancet 2023 · Lilly TRIUMPH program 2025 · manufacturer prescribing information (tirzepatide, semaglutide). Formulas: concentration = mg ÷ mL; units = dose ÷ concentration × 100 (U-100). Retatrutide is investigational; peptide doses shown are educational reference only, not a prescription or medical advice. Talk to your prescriber.