Sermorelin monthly cost calculator
By Ray Kaminski, who covers specialty pharmacy pricing and compounding economics.
Updated September 2026.
Sellers quote sermorelin on at least thirteen different billing cycles. Put the figure you were quoted in below, say what it covers, and read what a month of it actually costs. The arithmetic is printed under the answer so you can check it.
The same figure on a 4-week cycle. Watch what happens to the answer — that gap is why this tool exists.
What a month of that costs
$217.43
a standing monthly rate
$200.00 ÷ 28 days × 30.44 days = $217.43
A month is 30.44 days on average, so a charge every 28 days lands 13.04 times a year rather than 12. That is what makes this figure larger than the one on the invoice.
Why four weeks is not a month
A month averages 30.44 days. A four-week cycle is 28. That four-and-a-bit-day gap does not sound like much until it repeats: a charge every 28 days lands 13.04 times in a year, and a charge every month lands twelve times. The annual difference is one extra payment.
So the same headline figure buys a different amount of drug depending on a word most pages print once, in the checkout flow, after the price. That is the single most common way a sermorelin price is not the price.
Bars are the monthly figure, on a scale to $240.00.
Computed by this page’s own arithmetic — the same lib/monthly.ts the calculator above runs — from one illustrative $200.00 figure, using 30.44 days as the length of an average month (365.25 ÷ 12 = 30.4375, rounded to the two decimals the page prints so the working divides out). $200.00 is a round number chosen to make the cycles comparable. It is not a price any seller charges, and no figure on this page comes from our roster.
Where a prepaid total stops being comparable
A seller that asks for one payment covering three months has told you two things: the total, and the term. It has not told you the rate. Dividing gives an average over that term, which is a fair way to compare two prepaid plans of the same length against each other — and a poor way to compare one against a month-to-month subscription, because only one of the two is a number that repeats.
The tool labels that answer as an average every time it produces one, in words rather than in a colour. It is the one thing on this page that a reader could quote back at us wrongly, so it does not rely on being noticed.
What to read off the page before you type
The figure and the cycle are usually printed in different places, and the cycle is almost always the smaller type. Three things are worth finding first:
- The cycle, from the checkout, not the headline. A headline says “from $X”; the order summary says how often $X is taken.
- Whether the first period is discounted. An introductory price makes the first charge unrepresentative of every charge after it, and the tool has no way to know that from one figure.
- What the figure includes. A price with the consult in it and a price without are not the same price on any cycle.
What each of the sermorelin sellers we track publishes, with the billing cycle attached has all three, read from each seller’s own page.
Questions
Is “every 4 weeks” the same as “monthly”?
No. Four weeks is 28 days and an average month is 30.44, so a 4-week charge falls 13.04 times a year against a monthly charge’s twelve. On a $200.00 figure that is $17.43 a month, or $200.00 a year — one extra payment.
Why 30.44 days and not 30?
Because a year is 365.25 days and twelve months of 30 is 360. Using 30 would understate every day-based cycle by about 1.5%. 30.44 is 365.25 ÷ 12 rounded to the two decimals this page prints, and the page divides by the same 30.44 it shows you.
Can I use this to find the cheapest seller?
Not on its own, and we do not name a cheapest anywhere on this site. Two figures on one cycle are still not comparable unless they buy the same dose and include the same things — a lower monthly number at a lower dose is not a lower price. The conversion removes one of the differences between two quotes; it does not remove the rest.
Does this page know what any seller charges?
No. It holds no prices at all. Everything it prints is computed from the numbers you type, which is also why it carries no links to any seller — see how this site makes money.
The sellers that publish a standing monthly rate, ranked by what each one discloses