retatrutide calculator

10 mg in 2 mL = 5 mg/mL; 10 units on a U-100 syringe holds 0.5 mg.

Sizes on sale: 5mg, 10mg, 15mg, 20mg, 30mg, 40mg, 48mg, 50mg, 60mg. Choose a vial, the water and the amount per draw; prices are the lowest current US offers.

search a compound or a supplier’s vial

amount in the vial

bacteriostatic water added

amount per draw

doses used in the cited label or trials:

syringe · picked to fit the draw

price, vial size and certificate correction

vial price (optional)

USD

Lowest current US offer for this size.

vial holds (optional)

Most 2–15 mg vials hold 3 mL.

measured content on the COA

From the lot certificate; it replaces the label amount.

or HPLC purity

Certificates on file for this compound:

LA Peptides 10mg · lot 1518 · 2026-09-05 · Bioviridian Inc.: 10.89 mg measured, 99.79% purityCOA
Amino Club 10mg · lot RT0004 · 2026-08-21: 10.4 mg measured, 99.86% purityCOA

5 mg/mL

10 units holds 0.5 mg

concentration: 5 mg/mL
per unit: 50 mcg per unit
full draws per vial: —
cost per draw: —

the working

10 mg ÷ 2 mL = 5 mg/mL

If this is a prescription, the dose and volume on your pharmacy label take priority. Ask your pharmacist about any mismatch.

cheapest way to buy it

vendor	size	price	$/mg	checked	calculate with this vial, or view it
American Peptides	48mg	$300.00	$6.25	2026-11-06	view, Retatrutide 48mg at American Peptides, opens in a new tab
Nova Peptide Supply	50mg	$324.99	$6.50	2026-11-06	view, Retatrutide 50mg at Nova Peptide Supply, opens in a new tab
American Peptides	60mg	$400.00	$6.67	2026-11-06	view, Retatrutide 60mg at American Peptides, opens in a new tab
Nova Peptide Supply	40mg	$279.99	$7.00	2026-11-06	view, Retatrutide 40mg at Nova Peptide Supply, opens in a new tab
LA Peptidesfeatured partnerCOA 31.15 mg	30mg	$229.99	$7.67	2026-11-03	view, Retatrutide 30mg at LA Peptides, opens in a new tab
American Peptides	30mg	$240.00	$8.00	2026-11-06	view, Retatrutide 30mg at American Peptides, opens in a new tab
LA Peptidesfeatured partnerCOA 20.21 mg	20mg	$169.99	$8.50	2026-11-03	view, Retatrutide 20mg at LA Peptides, opens in a new tab
Nova Peptide Supply	20mg	$179.99	$9.00	2026-11-06	view, Retatrutide 20mg at Nova Peptide Supply, opens in a new tab

In-stock US offers checked in the last 7 days, before shipping. The featured partner is a paid placement and is labelled; order here is by price per mg.

updated Nov 4, 2026 · exact arithmetic, checked against 21 worked cases · prices from offers checked in the last 7 days

human trials · cited sources

doses of Retatrutide used in research

Investigational: no FDA approval (Drugs@FDA and the FDA statement checked 5 November 2026), and Lilly states it has not been approved by any regulator; Lilly plans a US submission in the first quarter of 2027. The phase 3 TRIUMPH-1 (NEJM 2026) and TRIUMPH-2 (Lancet 2026) trials randomized participants to 4, 9 or 12 mg once weekly for 80 weeks. These are the amounts specific labels and studies used, linked to each source. They are references, not recommendations; a prescription label takes priority.

Doses of Retatrutide used in labels and published studies
source	who	amount and schedule	route
Phase 3 TRIUMPH-1 (NEJM 2026): 4, 9 or 12 mg weekly for 80 weeks phase 3 trial · 2026 · PMID 42814954	2,339 adults with obesity, without diabetes (including subgroups of 574 with knee osteoarthritis and 243 with obstructive sleep apnea)	12 mg once weekly 80 weeks Arms were 4 mg, 9 mg and 12 mg; 12 mg is the highest. Mean weight change was -17.6% (4 mg), -23.7% (9 mg) and -25.0% (12 mg), vs -3.9% with placebo. Neither the abstract nor the registry (NCT05929066) gives the escalation schedule.	subcutaneous
Phase 3 TRIUMPH-2 (Lancet 2026): obesity with type 2 diabetes, 4, 9 or 12 mg weekly phase 3 trial · 2026 · PMID 42810372	1,152 adults with BMI 27 or higher and type 2 diabetes (HbA1c 6.5-10.5%)	12 mg once weekly 80 weeks Mean weight change at week 80 was -11.9% (4 mg), -16.8% (9 mg) and -18.8% (12 mg), vs -5.1% with placebo. Permanent discontinuation due to adverse events or death was 12% (9 mg) and 8% (12 mg). Registry: NCT05929079.	subcutaneous
Phase 2 (NEJM 2023): 12 mg weekly arm, started at 2 mg phase 2 trial · 2023 · PMID 37366315	338 adults with BMI 30 or higher (or 27 to under 30 with a weight-related condition), without diabetes	2 mg → 4 mg → 8 mg → 12 mg once weekly 48 weeks Arms were 1 mg, 4 mg (2 mg or 4 mg start), 8 mg (2 mg or 4 mg start) and 12 mg (2 mg start). The step order is from registry NCT04881760, which does not state how long each step lasted. Mean weight change at 48 weeks in the 12 mg group was -24.2%.	subcutaneous

Sources checked Nov 4, 2026.

Retatrutide 10mg in 2 mL

amount to syringe units

Retatrutide 10 mg in 2 mL: amount to syringe units
amount	mL	U-100 units	U-40 units
100 mcg	0.02	2	0.8
250 mcg	0.05	5	2
500 mcg	0.1	10	4
1 mg	0.2	20	8
2 mg	0.4	40	16
2.5 mg	0.5	50	20
5 mg	1	100	40

One unit on a U-100 syringe is 0.01 mL; on a U-40 it is 0.025 mL.

every Retatrutide vial size on sale

reconstitution chart

Concentration and amount per 10 units for Retatrutide vial sizes and water volumes
vial	1 mL water	2 mL water	3 mL water	5 mL water
5 mg	5 mg/mL 10 units = 0.5 mg	2.5 mg/mL 10 units = 0.25 mg	1.667 mg/mL 10 units = 0.167 mg	1 mg/mL 10 units = 0.1 mg
10 mg	10 mg/mL 10 units = 1 mg	5 mg/mL 10 units = 0.5 mg	3.333 mg/mL 10 units = 0.333 mg	2 mg/mL 10 units = 0.2 mg
15 mg	15 mg/mL 10 units = 1.5 mg	7.5 mg/mL 10 units = 0.75 mg	5 mg/mL 10 units = 0.5 mg	3 mg/mL 10 units = 0.3 mg
20 mg	20 mg/mL 10 units = 2 mg	10 mg/mL 10 units = 1 mg	6.667 mg/mL 10 units = 0.667 mg	4 mg/mL 10 units = 0.4 mg
30 mg	30 mg/mL 10 units = 3 mg	15 mg/mL 10 units = 1.5 mg	10 mg/mL 10 units = 1 mg	6 mg/mL 10 units = 0.6 mg
40 mg	40 mg/mL 10 units = 4 mg	20 mg/mL 10 units = 2 mg	13.333 mg/mL 10 units = 1.333 mg	8 mg/mL 10 units = 0.8 mg
48 mg	48 mg/mL 10 units = 4.8 mg	24 mg/mL 10 units = 2.4 mg	16 mg/mL 10 units = 1.6 mg	9.6 mg/mL 10 units = 0.96 mg
50 mg	50 mg/mL 10 units = 5 mg	25 mg/mL 10 units = 2.5 mg	16.667 mg/mL 10 units = 1.667 mg	10 mg/mL 10 units = 1 mg
60 mg	60 mg/mL 10 units = 6 mg	30 mg/mL 10 units = 3 mg	20 mg/mL 10 units = 2 mg	12 mg/mL 10 units = 1.2 mg

10 units on a U-100 syringe is 0.1 mL. Every cell is exact arithmetic: amount ÷ water.

what the numbers mean · where they come from

terms and sources

Label amount or measured amount. The calculator starts from the amount printed on the vial. A lot certificate’s measured content (net peptide content, in mg) can replace it for the vial that was tested. HPLC purity is a share of peak area, not a mass, so a purity-only correction is shown as an estimate. See HPLC, certificate of analysis and how to read a peptide COA.
Concentration. Amount in the vial ÷ water added. Terms: reconstitution, bacteriostatic water, lyophilized.
Syringe units. A volume: 0.01 mL per unit on a U-100 syringe, 0.025 mL on U-40. Units say nothing about the compound until the concentration is known.
Cost per draw. Vial price × amount per draw ÷ vial amount, from the price per mg of a current offer. Offers come from the Retatrutide price comparison; certificates from the COA library.

Arithmetic only, on the numbers entered. Amounts from labels or trials are cited references, not recommendations; PeptideTech does not give personal use instructions and does not test products.

short answers

Retatrutide calculator questions

How much bacteriostatic water do I add to Retatrutide 10mg?

Any volume the vial holds; 2 mL gives 5 mg/mL, so 10 units on a U-100 syringe holds 500 mcg. More water makes each draw read more units. The table below shows 1–5 mL for every Retatrutide vial size on sale.

What changes the calculated concentration?

Only two inputs: the amount of Retatrutide in the vial and the water added. 10mg in 2 mL is 5 mg/mL; twice the water halves it, and the amount per draw then reads twice the units. A lot certificate's measured content replaces the label: LA Peptides's 10mg lot 1518 measured 10.89 mg, which in 2 mL is 5.445 mg/mL. HPLC purity is a share of peak area, not a measured mass, so it is shown only as an estimate.

What doses of Retatrutide were used in research?

Investigational: no FDA approval (Drugs@FDA and the FDA statement checked 5 November 2026), and Lilly states it has not been approved by any regulator; Lilly plans a US submission in the first quarter of 2027. The phase 3 TRIUMPH-1 (NEJM 2026) and TRIUMPH-2 (Lancet 2026) trials randomized participants to 4, 9 or 12 mg once weekly for 80 weeks. The table on this page lists 3 sources with amounts, schedules and links.

What does Retatrutide cost per mg?

The lowest current US price is $300.00 for 48mg at American Peptides (about $6.25 per mg, checked 2026-11-06). The calculator turns any vial price into cost per draw.

How much Retatrutide is really in the vial?

Lot certificates on file report measured content: for example LA Peptides's 10mg lot 1518 measured 10.89 mg at 99.79% purity. Use the certificate correction to calculate from the measured amount.

more calculators

Volume and concentration arithmetic for laboratory reconstitution; not medical advice. API: /api/calc. Syringe scales: 0.3 mL U-100, 0.5 mL U-100, 1 mL U-100, 0.5 mL U-40, 1 mL U-40, 1 mL syringe, 3 mL syringe.