# What is “Current Round Variance” and “Average Block Variance”

### All this variance talk can be pretty confusing but actually it’s just a fancy way of saying “pool performance” and is the best statistic for any pool to judge the current performance and average performance over a period of time.

#### What is current round variance?

The simplest explanation for this live metric, is the exact expected time for our pool to find a block is at 100% variance. If we find a block at 50% variance, then it was found twice as fast as expected. However, if we were to find a block at 200% variance, then it was found twice as slowly. Just think of it like a clock constantly counting towards our expected time to find a block. This depends on numerous factors such as pool hashrate, network hashrate and network difficulty this means variance is constantly shifting based on these metrics. If the pools hashrate goes down it is expected to take longer to find a block. If the network speed and thus difficulty goes up it gets more difficult to find a block so it will also take more time to find a block.This is automatically adjusted in real time and displayed as “Current Round Variance”. Luck also plays a big role here. Normal values for round variance are 20-300% but sometimes strange things can happen such as our very first block which was found at 3%.

#### What is average block variance?

Now that you understand what is current round variance then average block variance is easy. When a block is found by the pool the current round variance at which it was found is recorded by the pool. This way we are able to judge the average block finding performance of the pool over a period of time. Usually over the last 16/64/128/256/512 blocks found.

Here is an example of average variance from a pool blocks page:

Let’s take the last 64 blocks as an example. The average variance at which those blocks were found is 105% meaning that it was a bad day for the pool and it earned 5% less than the expected average. You can find these statistics on the “Blocks” page of each of our pools.