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Gas Limit

The maximum amount of gas a transaction is permitted to consume before execution stops.

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Definition

The maximum amount of gas a transaction is permitted to consume before execution stops.

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Why it matters

Transaction and fee concepts explain how users submit work to a blockchain and how network resources are priced.

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How it works

Before sending a transaction, the wallet calculates an estimate of the required gas. The user or wallet sets a limit higher than this estimate to account for potential variations. If the transaction finishes before reaching the limit, the user only pays for the amount actually used; if it hits the limit, the transaction fails.

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Real-world example

If you are minting an NFT, your wallet might suggest a gas limit of 200,000. If the contract only needs 150,000 to succeed, your transaction goes through and you pay for 150,000.

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Advantages

  • Prevents infinite execution loops
  • Protects user funds from errors
  • Provides predictable resource usage caps

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Limitations

  • Transaction fails if set too low
  • Can lead to wasted gas if set too high
  • Requires estimation tools

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Common misconceptions

  • Many think a higher gas limit makes the transaction faster, but it only prevents the transaction from failing early.
  • Some believe the gas limit is the total fee, but the fee is calculated using the price multiplied by the used gas.
Canonical knowledge ID: glossary:gas-limit