> For the complete documentation index, see [llms.txt](https://docs.glassnode.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.glassnode.com/further-information/metric-guides/coin-days-destroyed/supply-adjusted-cdd.md).
# Supply-Adjusted CDD
## Indicator Overview
Supply-Adjusted CDD accounts for the impact that coin day accumulation by the total supply has on the [Coin Days Destroyed](/further-information/metric-guides/coin-days-destroyed/cdd-coin-days-destroyed.md) metric. As more coins are issued and more coin days are accumulated by the aggregate network, the lower bound of coin days destroyed will increase over time.
This results in a steadily rising 'floor value' and potential for higher 'peak values' of CDD which therefore requires additional consideration in analysis to accurately compare measurements from different points in time. Adjusting for supply aims to provide a more proportional and equivalent view of indicator values over the history of the market.
The rationale behind supply adjustment is as follows:
* Early in a protocol's life, coin supply is small and so is the aggregate accumulated lifespan and thus the required adjustment is larger to scale up in line with more recent values.
* Later in a protocol's life, coin supply is larger and so is the aggregate accumulated lifespan so the required adjustment is smaller relative to recent values.
In general, horizontal levels and values in supply adjusted metrics are likely to more consistent over time than those for the base metric. The trends, fractals and interpretation remain consistent between both the original metric and supply adjusted variants.
* [View Supply-Adjusted CDD in Glassnode Studio](https://studio.glassnode.com/metrics?a=BTC\&m=indicators.CddSupplyAdjusted)
* [View Supply-Adjusted CDD in Glassnode API Docs](https://docs.glassnode.com/basic-api/endpoints/indicators#supply-adjusted-cdd)
## How is it measured?
Supply-Adjusted CDD simply divides CDD by the circulating supply (total amount of coins issued).
$$
\begin{align\*} \textrm{Supply-Adjusted CDD} &= \frac{\textrm{CDD}}{\textrm{Total Supply}} \\\[0.5em] &=\frac{ \textrm{value} \cdot \textrm{lifespan}~~{\color{gray}{\[\textrm{days}]}}~~{\color{gray}{\textrm{(of all spent outputs)}}} }{ \textrm{value}\~{\color{gray}{\textrm{(of all UTXOs)}}} } \end{align\*}
$$
## About
### Coined By
[Hans Hauge](https://twitter.com/hansthered) (May 2019)
### Further Resources
Hans Hauge - [Introducing Binary Adjusted BDD](https://www.kanaandkatana.com/valuation-depot-contents/2019/5/30/exploration-of-bitcoin-days-destroyed)
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