Calculate the exact cost of Ethereum transactions. Estimate gas fees for transfers, token swaps, NFT purchases, and smart contract interactions.
Gas is the computational effort required to execute transactions on Ethereum. Each operation costs a certain amount of gas. You pay Gas Used × Gas Price.
The minimum gas price required for inclusion in a block. This adjusts automatically based on network demand. Base fees are burned (destroyed).
An optional tip paid directly to validators to prioritize your transaction. Higher tips = faster confirmation.
Maximum gas you're willing to spend. Simple transfers need ~21,000 gas. Complex DeFi operations can require 200,000+. Unused gas is refunded.
ETH Transfer: 21,000 gas
Token Transfer: 65,000 gas
Uniswap Swap: 150,000 gas
NFT Mint: 100,000+ gas
Nothing stings quite like paying $50 in gas to swap $100 worth of tokens. During busy periods, Ethereum gas fees get ridiculous. But here's what most people don't realize: timing matters, a lot. The same transaction that costs $50 during peak hours might cost $5 on a weekend morning. You can also save by using Layer 2 networks where fees are pennies instead of dollars. We'll explain exactly what gas is, why prices swing so wildly, and how to stop leaving money on the table every time you make a transaction.
Every action on Ethereum costs computational effort. Transferring ETH costs 21,000 gas units, always. A Uniswap swap costs around 150,000 gas. Minting an NFT might cost 200,000+. These numbers are fixed based on what your transaction does. What changes is the price per gas unit. When the network is busy, prices spike. When it's quiet, they drop. Your total fee = Gas Used x Gas Price. Gas price is measured in gwei (one-billionth of ETH). At 50 gwei with a 150,000 gas swap, you pay 7,500,000 gwei = 0.0075 ETH. At $3,000 ETH, that's $22.50 for one swap. Set a gas limit (maximum you'll pay) when you transact. If your transaction needs more gas than the limit, it fails and you still lose everything you spent up to that point. That's why proper gas estimation matters.
