What is a Gas Limit, and What is its Purpose?

What is a Gas Limit, and What is its Purpose?

Gas limit is the pricing value required to conduct a transaction on the blockchain platform. In this guide, learn more about what is a gas limit in...

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The Ethereum network is getting more popular by the day as it supports the creation of decentralized apps (DApps) and takes DeFi further ahead. Ethereum chain-based transactions are increasing in number as well. Each transaction on this chain requires some transactional cost, called the gas fees. Each user has a certain limit up to which they are willing to pay for the transactions. This limit is called the gas limit in blockchain. 

Complex transactions require more gas and thus enhancement in the gas limit. If you want to learn in detail regarding the whole transactional scenario around the ETH chain, you need to know the answer to ‘what is a gas limit?’. Without further ado, let’s find out about the cryptocurrency gas limit. 

What is Gas Limit? 

The gas limit in blockchain technology refers to the maximum amount of computational effort a user is willing to expend on a transaction or smart contract execution. It prevents excessive use of network resources by setting a cap on the work that can be done. Users set this limit to manage costs, as each operation requires a certain amount of gas, with the price determined by network demand. A transaction fails if the gas limit is too low, not completing its intended action, but still consuming the set gas.

The gas limit is like setting a budget for how much you’re willing to spend on sending a transaction or running a program on a blockchain, like Ethereum. It stops your transaction from using up too much of the blockchain’s energy. Think of it like telling a taxi driver the most you’ll pay for a ride. If the ride costs more than your budget, you won’t get to your destination. If it costs less, you only pay for the distance covered.

What is the Purpose of Gas Limit?

Over the ETH network, the processing of pending transactions depends on the gas limit that each transaction is willing to spend on the block. The Ethereum Virtual Machine processes every transaction and requires some amount of gas fees for execution. Each block has its gas limit. While creating a block, designated users must remember that the total transactional gas limit is not to exceed the block’s gas limit. Thus, every transaction’s gas limit has to be carefully decided.

How do Gas Limits Work?

How do Gas Limits Work
Source: Blockgeeks / What is a crypto gas limit in blockchain: purpose of cryptocurrency block limit

Gas fees provide each node involved some incentive to add a new block to the chain and execute a transaction. Now, they may charge very high depending upon the traffic on the chain. The gas limit controls the users over how much they spend on executing a transaction. A simulator suggests average gas fees to the users, who can then decide whether they want to keep the gas limit equal to the average, higher, or lower. A higher gas limit will get your transaction processed faster since the designated node would get to charge more. A lower gas limit will keep you in the queue until any willing node decides to execute the transaction. Usually, people keep the cryptocurrency gas limit equal to the average gas fees.

What is the Transaction Gas Limit?

Users have the right to decide a cryptocurrency gas limit for each transaction based on the gas fees required for transactions. The transaction gas limit in the blockchain decides whether the transaction will get executed. The limit being higher than or equal to the gas fees mandated by the authorized nodes means the transaction will be successful. If the transaction gas limit is lower than the gas fees, the transaction fails.

Do I get my Gas back for a Failed Transaction (out of gas)?

If your transaction fails due to running out of gas, you lose the gas already consumed. Therefore, setting gas limit low might result in the transaction getting dropped from mempools or staying pending indefinitely.

Why are Ethereum Transaction Fees so High?

Ethereum Transaction Fees
Source: Freepik

The Ethereum chain has grown rapidly over the last few years. Creation of DApp and other DeFi based transactions requires gas for execution. Due to high traffic on the blockchain, miners on proof of work Ethereum had to keep adding more blocks to the chain, which required a lot of time and computational power.

However, the Ethereum transaction fees are also decided by the complexity of the transaction. Processing an ERC-20 token is easier and thus requires a lesser crypto gas limit.

Calculating Ethereum Gas Costs 

Calculating Ethereum Gas Costs
Source: Freepik

The Ethereum blockchain has no specific method to calculate the gas limit since the whole process is based on supply and demand. Every transaction gets processed by an authorized node, and the entire gas cost depends on how much profit share they can earn from the transaction. So, ETH gas costs are usually set by the competitive environment created by users lining up to get their transactions processed. 


In conclusion, the cryptocurrency gas limit is very important in deciding whether an ETH block will have your transaction added. Ethereum’s recent transformation to a proof of stake protocol from a proof of work one has many plans to deal with issues PoW Ethereum was facing. However, the gas fees haven’t come much lower yet. What the blockchain does to eradicate the high gas fees issue still remains to be seen.

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