Crypto Gas Fee Calculator (Gwei & Layer 2)

📋 How to use this calculator

1. Enter the current gas price in Gwei (check Etherscan Gas Tracker or your wallet).
2. Pick the transaction type: simple transfer (21,000 gas), ERC-20 transfer (~65,000 gas), Uniswap swap (~150,000 gas), or NFT mint (~250,000 gas).
3. Enter the current ETH price in USD for automatic fee conversion.
4. Compare the same operation across Layer 2 networks: Arbitrum, Optimism, Base, Polygon, zkSync, or alternative chains like Solana.
5. Use the gas optimizer tips: batch transactions, set an appropriate EIP-1559 maxFee, transact during off-peak hours (00:00-06:00 UTC).
6. Review the slow/standard/fast price tiers to balance speed against cost.
7. Check the estimated confirmation time for each tier before submitting.

🧮 Ethereum transaction fee (EIP-1559)

• Gas_used = gas units consumed (21,000 for a simple transfer)
• Base_fee = minimum gas price in Gwei (burned)
• Priority_fee = validator tip in Gwei
• 1e9 = Gwei-to-ETH conversion (1 ETH = 10^9 Gwei)

Layer 2s use rollups that batch hundreds of transactions before settling on Ethereum, so per-transaction fees are 10-100x cheaper. Solana charges a flat fee of ~$0.00025 thanks to its different architecture (Proof of History).

💡 Worked example: Uniswap V3 swap at 25 Gwei

Result: The same swap costs $13.13 on Ethereum mainnet vs $0.50 on Arbitrum - about 26x cheaper. For routine transactions under $1,000, use a Layer 2 to save on fees.

❓ Frequently asked questions

📚 Sources & references

• Ethereum Gas and Fees Documentation — Ethereum Foundation
• L2BEAT - Layer 2 Comparison — L2BEAT
• EIP-1559 Specification — Ethereum Improvement Proposals
• Etherscan Gas Tracker — Etherscan