NAD+ price normalizer
A calculator. It holds no prices and names no seller.
Put two NAD+ quotes that are billed on different cycles onto one calendar month, and read the conversion that was performed to get there.
The commonest collision in this category. The lower headline figure bills 13 times a year rather than 12, and the order of the two reverses once both are on one basis. These figures are illustrative shapes, not prices anybody publishes.
| What is being worked out | Price A | Price B |
|---|---|---|
| Days one charge coversfrom the cadence you chose | 30.44 days | 28 days |
| Cost per day$149.00 ÷ 30.44 days$139.00 ÷ 28 days | $4.89 | $4.96 |
| On one calendar month$149.00 × 30.44 ÷ 30.44 days$139.00 × 30.44 ÷ 28 days | $149.00 | $151.11 |
| Over a year$149.00 × 365.2425 ÷ 30.44 days$139.00 × 365.2425 ÷ 28 days | $1,787.82 | $1,813.17 |
What was converted, and on what assumption
Price A. Quoted a calendar month. A calendar month is not a fixed number of days, so this uses the average one: 365.2425 ÷ 12 is 30.436875 days, rounded here to the 30.44 days shown in every line of working below. This site divided the price by that number of days and multiplied back up; the seller published the first figure and none of the rest.
Price B. Quoted every 4 weeks. Four weeks is 28 days, which is not a month. A seller billing every 4 weeks charges 13 times a year, not 12. This site divided the price by that number of days and multiplied back up; the seller published the first figure and none of the rest.
A calendar month is not a fixed number of days. Every figure in the “calendar month” row above is a per-day cost multiplied by 30.44 — the average length of a month across a year, 365.2425 ÷ 12. A seller billing every 28 days charges 13 times in that year and a seller billing monthly charges 12, which is the entire reason the two headline numbers cannot be set beside each other as they are printed.
The gap. $4.96 − $4.89 = $0.07 a day — $0.0694 before rounding, which is what the annual figure is computed from — and $25.35 over a year. This tool does not say which of your two numbers is the better buy: it has no idea what either one includes, what dose it buys, or whether either seller would still quote it.
Why this is needed
Counted across the 106 sellers in this site’s index, read September 2026.
NAD+ is not sold on one cadence. Of the 376 figures behind this site’s index, 40 standing rates are billed on something that is not a calendar month — every four weeks, every 28 days, across a three-, six- or twelve-month term. 60 of the 106 sellers publish no standing monthly rate at all.
Two of those numbers printed side by side look comparable and are not. A charge every four weeks lands 13 times in a year; a monthly charge lands 12. On a $139 figure that is $1,807 a year against $1,668 for a $139 monthly plan — the same headline number, $139 apart in practice. The order of two sellers can reverse on that alone, which is why this site records the seller’s own words for a cycle and never treats a cycle as a month unless the page says month.
What this tool will not do
- It does not name a cheaper option. It restates two numbers you typed and prints the subtraction between them; it has no idea what either price includes, what dose it buys, or whether either seller would still quote it.
- It does not divide a prepay total into a monthly rate and call it one. Dividing a lump sum gives you what the total works out at, not a plan the seller offers, and the output labels it that way every time.
- It does not guess how long a single session lasts. If a clinic does not say, that number is your assumption and the tool prints it as yours.
- It does not know a milligram from a millilitre. Two prices normalised to the same month can still buy completely different amounts of NAD+, and 250 of the 376 figures behind this site state no dose at all.
No paid links on this page
This site publishes 1 tool page, and it does not carry a paid link, a seller button or a tracked outbound hop of any kind. That is checked on every build by walking this page’s real import graph, not by trusting this sentence. The price index, the boards and the seller reviews do carry them, and what that pays for is counted on the disclosure page.