// multi-utility computation suite · offline · instant · precise
┌──────────────────────────┐
│ [c] calcalyst_ │
│ computation suite │
└──────────────────────────┘
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web3.gas-fee-estimator Calculator
Estimates the Ethereum gas fee for a transaction type (ETH transfer, ERC-20 transfer, swap, NFT mint) based on current gas price and block fullness. ETH transfers cost 21,000 gas; ERC-20 transfers ~65,000; Uniswap v3 swaps ~180,000 — gas cost is independent of the amount transferred.
Inputs
Base Fee
Reference formula or conversion factor shown for context.
Priority Fee
Reference formula or conversion factor shown for context.
Gas Limit
Maximum computation units this transaction can use. Simple ETH transfer: 21,000. Complex smart contracts: millions.
Eth Price
Current USD price of 1 ETH. Used to convert gas fees from ETH to dollars. Highly volatile.
Results
gas fee (ETH)
This transaction's cost in ETH. Gas cost (ETH) = gas used × gas price (gwei) × 10⁻⁹.
gas fee (USD)
This transaction's cost in US dollars at the current ETH price. Gas fees are volatile — during network congestion they can spike 10–100x their normal level.
total gwei
Total gas cost in gwei. 1 gwei = 10⁻⁹ ETH. A simple ETH transfer uses 21,000 gas; complex smart contract calls can use millions.
base fee (Gwei)
Reference formula or conversion factor shown for context.