By Carlos Ochoa
A common question when it comes to Chia plotting is "What does the K in K32 mean?" In Chia, plot sizes are defined by the letter k, which is an integer in the equation
plot_size_bytes = C1 * 2^k(k + C2)
In practice, this equation means that a K=33 plot will be about twice as large as a K=32 plot, and a K=34 plot will be about twice as large as a K=33 plot. For reference, we've included a table below showing you the temp and final sizes for different k values.
Larger plots take longer to create than smaller plots, obviously. The largest k value ever plotted was a K=38, which took 46 days to plot, required about 23 TB of temp space and had a final plot size of 8.2 TB.
What size plots should I be plotting?
In most cases, you should be fine plotting at K=32. Larger plot sizes like K=33 and K=34 can come in handy when you're trying to fill up an HDD to capacity, but that's not an exact science and requires some experimentation.
Do keep in mind that at some point in the future when the Chia ledger reaches a certain size, K=32 plots will stop working, but it's going to take many, many years to get there. So for now, stick to your K=32s and worry about replacing them with K=33s or K=34s when the time comes.
|K-size||Temp size||Final size|
|K=32||332 GiB (356.5 GB)||101.4 GiB (108.9 GB)|
|K=33||589 GiB (632.4 GB)||208.8 GiB (224.2 GB)|
|K=34||1177 GiB (1263.8 GB)||429.8 GiB (461.5 GB)|
|K=35||2355 GiB (2528.7 GB)||884.1 GiB (949.3 GB)|