Gas Cost & Estimation

Transaction Fee

Transaction fee = Gas units * Gas price

Core Concepts

Gas units: unit of computation for executing an operation.

Gas price: how much ETH you pay for every gas unit, it is composed of base fee and priority f…


This content originally appeared on DEV Community and was authored by Loading Blocks

Transaction Fee

Transaction fee = Gas units * Gas price

Core Concepts

  • Gas units: unit of computation for executing an operation.
  • Gas price: how much ETH you pay for every gas unit, it is composed of base fee and priority fee (tip).
  • Gas limit: the maximum gas you allow for one transaction.

Important Mechanism

  • Gas refund: unused gas will be refunded to sender after the transaction finish.
  • Out of Gas: if gasUsed > gasLimit, transaction will fail and rollback all state changes, but the gas already used will not be refunded.
  • Batching: better to split heavy computation into multiple smaller transactions to avoid exceeding gas limit. 
// ❌ Bad:
// function doMassiveLoop() public {
//     for (uint i = 0; i < 1000000; i++) {
//         // ... do work
//     }
// }

// ✅ Good: batches
uint public start = 0;
uint public constant INCREMENT = 100;

function doWorkInBatches() public {
    uint end = start + INCREMENT;
    for (uint i = start; i < end; i++) {
        // ... only do small part of work
    }
    start = end; // update next starting index
}


This content originally appeared on DEV Community and was authored by Loading Blocks


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