Gas speed
🐢 Slow
10 Gwei
5–10 min
⚡ Standard
15 Gwei
~1 min
🚀 Fast
25 Gwei
~15 sec
Transaction type
ETH Transfer
21,000 gas
ERC-20 Transfer
~65,000 gas
Uniswap Swap
~150,000 gas
NFT Mint
~200,000 gas
Contract Deploy
~250,000 gas
Custom
Enter gas limit
Fee in ETH
—
Ether
Fee in USD
—
at current price
What are Ethereum gas fees?
Gas is the unit of measurement for computational work on the Ethereum network. Every transaction requires a certain amount of gas depending on its complexity. A simple ETH transfer costs 21,000 gas; a complex DeFi interaction can cost 200,000 or more.
The gas fee you pay equals the gas used multiplied by the gas price in Gwei. Gas prices fluctuate based on network demand — during periods of high activity fees spike significantly. The EIP-1559 upgrade introduced a base fee that is burned and a priority tip that goes to validators.
Frequently asked questions
What is Gwei?
Gwei is a denomination of Ether. 1 Gwei = 0.000000001 ETH (10^-9 ETH). Gas prices are quoted in Gwei because the numbers are more readable — saying "15 Gwei" is easier than "0.000000015 ETH".
Why do gas fees change?
Gas fees are determined by supply and demand. When more people want to transact simultaneously, users bid higher gas prices to get their transactions included faster. Fees spike during NFT mints, DeFi launches, and market volatility events.
What is the difference between gas limit and gas price?
Gas limit is the maximum amount of gas you are willing to use. Gas price is what you pay per unit of gas. Total fee = gas used × gas price. Unused gas is refunded — setting a higher limit does not cost more if the transaction uses less.
How can I reduce gas fees?
Transact during off-peak hours (weekday early mornings UTC). Use Layer 2 networks like Arbitrum or Optimism. Batch transactions where possible. Use gas trackers to find the optimal time.
Common gas costs
ETH transfer: 21,000
ERC-20 transfer: ~65,000
Uniswap swap: ~150,000
NFT mint: ~150–300,000
Contract deploy: ~500,000+
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