Peptide Cost Per Mg Calculator

Vial prices are quoted every way except the one that lets you compare them. Enter the price and size for up to four vials and this normalizes each to a cost per milligram, so a "cheaper" vial that holds less stops looking like a deal.

Research use only. This is price arithmetic for comparing research materials, not a dose, a schedule, or a purchase recommendation. The one number that decides whether a low price is real value is the peptide mass and purity, and the only trustworthy source for those is a lot-matched third-party COA, not the label.

Value comparison

Price and vial size in, cost per milligram out. Add net peptide content if a COA reports it to get the truer cost per milligram of actual peptide.

Vial	Price$	Sizemg	NPC% opt.	Cost / mg$ / mg	Active$ / mg

Values update as you type. Nothing is saved or sent anywhere.

Net peptide content (NPC) is the fraction of the vial's mass that is actually peptide rather than counterion salt or moisture. A "10 mg" vial at 70% NPC holds 7 mg of peptide, so its real cost per milligram is higher than the label math suggests. Leave NPC blank to compare on label mass alone; fill it in only from a COA that states it.

A rough reference, not a rule

Across the research-peptide market, single compounds are commonly quoted somewhere in the region of a few dollars to roughly ten dollars per milligram, varying widely by compound, vial size, and how much independent testing sits behind the number. Treat that only as a sanity check: a price far below the pack usually means a larger vial, a lower purity, or no verifiable COA, not a free lunch.

Static reference tables

These are generic reference figures for comparing vials against each other, not quoted prices from any vendor. Nobody is selling at these numbers; they are round inputs run through price ÷ size so you can see the shape of the arithmetic without typing anything. Real listings sit wherever they sit, and only a lot-matched COA tells you the milligrams are real.

Price per mg by vial size and vial price

Cost per milligram for six common vial sizes crossed with a generic price ladder. Rows are vial size in mg, columns are the price paid for that whole vial in USD. Figures are rounded to 2 decimals.
Vial size	$30 vial	$50 vial	$70 vial	$90 vial	$120 vial
5 mg	$6.00/mg	$10.00/mg	$14.00/mg	$18.00/mg	$24.00/mg
10 mg	$3.00/mg	$5.00/mg	$7.00/mg	$9.00/mg	$12.00/mg
15 mg	$2.00/mg	$3.33/mg	$4.67/mg	$6.00/mg	$8.00/mg
20 mg	$1.50/mg	$2.50/mg	$3.50/mg	$4.50/mg	$6.00/mg
30 mg	$1.00/mg	$1.67/mg	$2.33/mg	$3.00/mg	$4.00/mg
50 mg	$0.60/mg	$1.00/mg	$1.40/mg	$1.80/mg	$2.40/mg

Worked example: bigger vial, higher sticker, lower cost per mg

The same worked example described above, laid out side by side. The $80 vial costs more up front and still normalizes to less per milligram.
Vial	Price	Size	Cost per mg	Which is cheaper per mg
Smaller vial	$45.00	10 mg	$4.50/mg	Lower sticker price, higher cost per mg
Bigger vial	$80.00	20 mg	$4.00/mg	Lower cost per mg despite the higher sticker price

Read the columns, not the sticker. Every cell above is label mass only. If a COA reports net peptide content below 100%, divide the size by that fraction first and the cost per milligram of actual peptide rises accordingly. None of this speaks to aliquots, draw volumes, or use of any kind; it is purchase arithmetic for research materials.

The math, in one line

cost per mg = vial price ($) ÷ vial size (mg). That is the honest way to line up vials priced at different sizes. When a lot's COA reports net peptide content, the truer figure is cost per mg active = price ($) ÷ (size (mg) × NPC%), because you are paying for the peptide, not the salt it ships as.

Worked example: a $45 vial of 10 mg is $4.50 per mg; an $80 vial of 20 mg is $4.00 per mg. The bigger vial wins on value despite the higher sticker price, which is exactly the comparison the sticker price hides.

The comparison is only as honest as the two inputs behind it. A rock-bottom cost per milligram means nothing if the milligrams are not really there or the purity is unverified, which is why the vials worth comparing are the ones whose mass and purity you can check on an independent third-party COA before you pay. Learn how to verify a COA by its accession code and the vendor red flags that make a low price a warning rather than a win.

Disclosure: coaindex is affiliated with Pepora and earns a commission on code UTILITY15. Pepora is scored on the same published criteria as every other supplier in our vendor table at /vendors, where it currently does not rank first.

The cheapest cost per milligram only wins if the milligrams are verified.

Pepora publishes independently verifiable third-party COAs (Freedom Diagnostics, HPLC plus mass spec) you can look up by accession before you buy, so the size and purity you type into this calculator are checked figures rather than label guesses. It ships from the US.

See Pepora's verifiable COAs

Use code UTILITY15 for 15% off