A Deep Dive Into Rejected Shares in Mining

If you’re new to the world of mining, you may have heard about something called “rejected shares” and wondered what it is. Rejected shares are essentially rejected work units that your miner creates because it has become disconnected from the blockchain network. The rejection rate of shares can be an essential indicator of how successful your mining operation is, so understanding why and how rejected shares happen is key to optimizing your mining experience.

Understanding Rejected Shares

Rejected shares are an unfortunate reality of mining. They are shares that were generated but could not be submitted to the mining pool due to network fluctuations or other factors. But what is a rejected share, and how do they affect your mining? Rejected shares occur when miner hardware is sending too quickly, meaning that the data is not correctly transmitted, and thus, it is returned back as rejected by the mining pool. This can be caused by a disconnection from the pool, hardware instability, and bad Internet connection, among many other reasons; Rejected shares can heavily hinder your mining process, resulting in fewer profits for you as a miner. Fortunately, there are steps you can take to reduce their presence and make sure that your profits remain on track.

Calculating the Rejection Rate

The rejection rate can be calculated by taking the total number of rejected shares divided by the total number of submitted shares. This provides an estimated figure for how many work units were rejected out of all those attempted by your miner. It’s important to note that different pools have different thresholds for rejecting work units so this figure may vary between pools depending on their specific requirements.

Reducing and Avoiding High Rejection Rates

With the increasing competition in the cryptocurrency space, it is becoming ever more critical for miners to ensure they are as efficient as possible. A great way to measure this efficiency is by looking at the miner’s rejection rate. The rejection rate measures the ratio of rejected shares from a miner relative to the total amount of shares submitted; a lower number means that more of their effort is being rewarded with actual Bitcoin rewards. This makes them much more competitive and will enable them to make bigger profits in the long run. It’s an important aspect to consider when choosing or investing in a miner and one that can have a big effect on profitability.

As long as the rejection rate is below 1%, it is normal

A rejection rate below 1% is entirely normal, but that doesn’t mean it can’t be improved. You can calculate your exact rejection rate by doing some simple math. First, you’ll need to know how many products were received and the number of expired repeated or other products. Then, just divide that total by the number of received products to get your rejection rate. By making sure you have accurate records, you can continually work towards improving this important metric and ensure your business remains successful.

If the rejection rate is higher than 1%, it is recommended that you investigate

If you’re dealing with a high rejection rate of over 1 percent when trying to mine, it’s essential to take the right steps to diagnose and solve the issue. Whether it be shutting down and restarting your miner, checking your network connection, or even replacing your router or switch entirely, there are multiple solutions available to investigate and hopefully rectify this problem. Taking the necessary steps to ensure your mining experience will be as successful as possible is an absolute must. Ensure you don’t miss out on any potential reward by leaving this issue unresolved.


High rejection rates in mining operations can significantly impede profitability as miners miss out on rewards from failed attempts at solving blocks on the blockchain network. Understanding why these rejections occur, as well as what steps you can take to reduce them, is key when it comes to optimizing your mining operations for maximum effectiveness and efficiency. By following the tips outlined in this blog post, miners should be able to minimize their rejected share rate and maximize their returns from their mining efforts!

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Disclaimer: The information provided on this blog is for informational purposes only and should not be taken as any form of advice.

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