Crypto Gas Fee
Estimate Ethereum and EVM chain gas fees in Gwei, USD, and native token for transfers, swaps, and smart contract interactions
Formula
Transaction Fee (ETH) = Gas Limit × Gas Price (Gwei) ÷ 1,000,000,000
Gas Limit is units of gas required for the operation. Gas Price (in Gwei) is what you pay per unit. Divide by 10^9 to convert Gwei to ETH. Higher gas prices mean faster confirmation.
Worked Examples
Example 1: Simple ETH Transfer
Problem:Send ETH to another wallet at 30 Gwei when ETH is $2,000.
Solution:Gas Limit: 21,000 (fixed for ETH transfers)\nGas Price: 30 Gwei\n\nFee calculation:\n21,000 × 30 Gwei = 630,000 Gwei\n630,000 ÷ 1,000,000,000 = 0.00063 ETH\n\nUSD cost:\n0.00063 × $2,000 = $1.26
Result:$1.26 to send any amount of ETH
Example 2: Uniswap Token Swap
Problem:Swap tokens on Uniswap at 50 Gwei during moderate congestion.
Solution:Gas Limit: ~150,000 (typical for swaps)\nGas Price: 50 Gwei\n\nFee calculation:\n150,000 × 50 = 7,500,000 Gwei\n7,500,000 ÷ 10^9 = 0.0075 ETH\n\nAt $2,000/ETH:\n0.0075 × $2,000 = $15.00\n\nThis same swap on Arbitrum L2: ~$0.30
Result:$15.00 on mainnet vs $0.30 on L2
Example 3: NFT Mint During Hype
Problem:Mint an NFT during a popular drop when gas spikes to 200 Gwei.
Solution:Gas Limit: ~200,000 (typical NFT mint)\nGas Price: 200 Gwei (congestion!)\n\nFee calculation:\n200,000 × 200 = 40,000,000 Gwei\n40,000,000 ÷ 10^9 = 0.04 ETH\n\nAt $2,000/ETH:\n0.04 × $2,000 = $80.00\n\nDuring extreme hype, fees can exceed $200-500!\nConsider: Is the NFT worth more than the gas?
Result:$80 gas fee during congestion
Frequently Asked Questions
What is gas in Ethereum and why do I need it?
Gas is a unit measuring the computational effort required to execute operations on Ethereum. Every action (transfers, swaps, contract interactions) requires gas. Gas acts as a fee mechanism preventing spam and compensating validators. The total fee = Gas Used × Gas Price. You set the gas price; higher prices mean faster confirmation as validators prioritize higher-paying transactions.
How do I reduce Ethereum gas fees?
Strategies: 1) Transact during low-traffic times (weekends, early AM UTC, late night EST), 2) Use Layer 2 solutions (Arbitrum, Optimism, Polygon) for 10-100x cheaper fees, 3) Batch multiple actions into single transactions, 4) Set lower gas prices and wait (may take hours), 5) Use gas-efficient protocols, 6) Monitor gas trackers (Etherscan, Gas Now) for optimal timing.
What is the gas limit and how do I set it?
Gas limit is the maximum gas you're willing to use for a transaction. Simple ETH transfers always use 21,000. Complex operations (swaps, NFT mints) use more. Wallets estimate limits automatically - don't reduce below estimates or transactions fail. Unused gas is refunded. Setting too low wastes your gas on a failed transaction with no refund.
What's the difference between base fee and priority fee?
Post-EIP-1559: Base fee is algorithmically determined and burned (destroyed). Priority fee (tip) goes to validators as incentive. Total gas price = Base Fee + Priority Fee. During congestion, the base fee rises automatically. To speed up transactions, increase the priority fee. Base fee is the minimum - transactions below it won't be included.