Ethereum Gas Usage Calculator

What is Gas?

Gas is a unit of computational work on Ethereum. Each operation (opcode) consumes a specific amount of gas. Total transaction cost = Gas Units × Gas Price.

Common Gas Costs:

• 21,000: Basic ETH transfer (minimum)
• SSTORE: 20,000 (new slot) or 5,000 (existing)
• SLOAD: 2,100 (warm) or 2,600 (cold)
• ADD/SUB: 3 gas per operation
• MUL/DIV: 5 gas per operation
• SHA3/Keccak256: 30 + 6 per word

Gas vs. Gas Price:

Transaction Cost = Gas Units × Gas Price (Gwei)
Example: 21,000 gas × 50 Gwei = 1,050,000 Gwei = 0.00105 ETH

Why Different Costs?

• Reading data: Cheaper (SLOAD)
• Writing data: Expensive (SSTORE)
• Complex calculations: More gas
• Storage operations: Most expensive
• Purpose: Prevent spam, incentivize efficiency