Cost per mg is the only number that makes differently-sized vials comparable. A $40 5 mg vial is $8.00 per mg; a $55 10 mg vial is $5.50 per mg, so the pricier vial is about 31% cheaper. Enter your options below to rank them, with discount codes and shipping included.
A math tool, not medical advice.
This calculator only does arithmetic on the numbers you type. It does not recommend a dose, a schedule, a compound, or a supplier. Most peptides are not FDA-approved and many have no legal supervised route at all. Check how we grade the evidence and talk to a licensed clinician.
Cost per mg, cheapest first
Enter a price and the milligrams per vial for at least one option. Cost per mg is the only figure that makes a 5 mg vial and a 10 mg vial comparable.
Arithmetic on the numbers you enter. A lower cost per mg says nothing about purity, whether the vial contains what the label claims, or whether the compound is legal to buy where you live. Cheapest is not safest.
How is peptide cost per mg calculated?
Take the price you actually pay, not the sticker price. Apply the discount code first, then add that vial's share of shipping, then divide by the milligrams in the vial. In formula terms:
cost per mg = ( price × (1 − discount) + shipping ÷ vials ) ÷ mg per vial
Shipping matters more than people expect on single-vial orders. A $15 flat shipping charge on one 5 mg vial adds $3.00 per mg, which can reverse the ranking entirely.
What cost per mg does not tell you
It is a purchasing figure, not a quality one. It does not capture purity, whether an independent certificate of analysis exists, whether the vial contains the stated mass, or whether the compound has any legal supervised route where you live. Most research peptides do not. Before treating a price as a reason to buy, check the compound's evidence grade and legal status, and see our cost comparator for what supervised access actually costs where a legal route exists.
FAQ
Frequently asked questions
How do you calculate cost per mg for a peptide?+
Divide what you actually pay for the vial by the milligrams of peptide in it. If a 10 mg vial costs $55, that is $5.50 per mg. Apply any discount code first, and add a share of the shipping cost, or a cheap vial with expensive shipping will look better than it is.
Why compare cost per mg instead of the sticker price?+
Because vials come in different sizes. A $40 5 mg vial and a $55 10 mg vial cannot be compared on price alone: the first is $8.00 per mg and the second is $5.50 per mg, so the more expensive vial is roughly 31% cheaper per milligram. Cost per mg is the only figure that puts different sizes on the same scale.
Does a lower cost per mg mean a better product?+
No. Cost per mg says nothing about purity, whether the vial contains what the label claims, or whether a third-party certificate of analysis exists. Unusually cheap research peptides are a warning sign, not a bargain. Price is one input and it is not the most important one.
Do you list peptide prices yourselves?+
Not for gray-market vials. Our cost comparator publishes typical supervised costs where a legal route exists and marks the rest UNKNOWN rather than quoting research-chemical vendor prices. This calculator takes numbers you bring so you can compare options without us endorsing any seller.