Multi-chain gas fee calculator for major blockchain networks. Calculate gas fees for Ethereum, Arbitrum, Optimism, BSC, Avalanche, Polygon, and other networks at different transaction speeds.
Select the blockchain network
Type of transaction to execute
Current gas price in gwei
Current price of the network's native token
Gas fees are transaction costs on blockchain networks. They compensate validators/miners for processing and securing transactions. Fees vary based on network congestion, transaction complexity, and urgency. Think of it like paying for computational power and network security.
Gwei (gigawei) is a denomination of cryptocurrency used to measure gas prices. 1 gwei = 0.000000001 ETH. Gas prices are quoted in gwei because transaction costs are tiny fractions of a full token. For example, 30 gwei = 0.00000003 ETH per gas unit.
Gas Limit: Maximum gas units you'll use (e.g., 21,000 for simple transfer).Gas Price: How much you pay per unit (in gwei).Total Fee = Gas Limit × Gas Price × Token Price.
Slow: Lower gas price, 5-10 minute confirmation. Average: Standard gas price, 2-5 minute confirmation. Fast: Higher gas price, 30 seconds - 2 minutes. Faster speeds prioritize your transaction but cost more.
Network congestion drives fee changes. During NFT drops, market volatility, or popular DeFi launches, everyone competes to get transactions processed first. Higher demand = higher fees. Fees drop during off-peak hours (weekends, late nights UTC).
Layer 2 networks (Arbitrum, Optimism, Base, Polygon) process transactions off the main chain and batch them for settlement. This reduces fees by 90-99% while maintaining security. If you transact frequently, Layer 2 is essential for cost savings.
Choose your blockchain: Ethereum (mainnet), Arbitrum/Optimism/Base (Layer 2s),Polygon (sidechain), BSC (Binance), or Avalanche. Each has different base costs and fee structures.
Select what you're doing: Simple Transfer (21k gas), ERC-20 Transfer (65k gas),NFT Minting (100k gas), Smart Contract (150k gas),Uniswap Swap (180k gas), or Complex DeFi (300k gas).
Enter current gas price in gwei. Check your wallet or https://etherscan.io/gastracker for real-time prices. Typical range: 10-50 gwei (low-normal), 50-100 gwei (high), 100+ gwei (extreme).
Enter the current USD price of the network's native token: ETH for Ethereum/Arbitrum/Optimism/Base, MATIC for Polygon, BNB for BSC, AVAX for Avalanche. Check prices on CoinGecko or your wallet.
You'll see three fee options: Slow (cheapest, slower confirmation),Average (balanced), and Fast (expensive, quick confirmation). Choose based on urgency and budget.
Gas prices change constantly. Always verify in your wallet before confirming. Use gas trackers like Etherscan Gas Tracker, GasNow, or Blocknative for live data and price predictions.
Calculate Ethereum ERC-20 token transfer at 40 gwei with ETH at $3,000:
Result: ~$7.80 average fee (slow: $6.24, fast: $9.36)
Gas Cost = (Gas Limit × Gas Price) / 1e9
Example: (21,000 × 30) / 1,000,000,000 = 0.00063 ETH
USD Fee = Gas Cost × Token Price
Example: 0.00063 ETH × $2,000 = $1.26
Final Fee = USD Fee × Network Multiplier
Ethereum: 1x | Arbitrum/Optimism: 0.1x | Polygon: 0.01x
Slow = Base Fee × 0.8
Lower gas price, longer wait. Saves ~20% on fees.
Average = Base Fee × 1.0
Standard gas price. Balanced speed and cost.
Fast = Base Fee × 1.2
Higher gas price, faster confirmation. Costs ~20% more.
Uniswap swap on Ethereum at 50 gwei with ETH at $3,000:
1. Gas Limit: 180,000 units (Uniswap swap)
2. Average: (180,000 × 50) / 1e9 = 0.009 ETH
3. USD: 0.009 ETH × $3,000 = $27.00
4. Slow: $27 × 0.8 = $21.60 | Fast: $27 × 1.2 = $32.40
Same transaction on Arbitrum: $27 × 0.1 = $2.70 (90% savings!)
Gas fees are typically 40-60% lower on weekends and during late-night hours (2-8 AM UTC). Avoid weekday afternoons and evenings when US/EU markets are active. Use gas trackers to identify low-fee windows.
Arbitrum, Optimism, Base, and Polygon offer 90-99% fee reductions compared to Ethereum mainnet. Bridge your assets once, then enjoy cheap transactions. Most major DApps now support Layer 2s.
Tools like Gnosis Safe let you batch multiple transactions into one, paying gas fees only once. This is crucial during high-fee periods - batch 5 transactions and save 80% on total fees.
Don't overpay by setting gas limits too high. Use recommended limits: 21k for transfers, 65k for ERC-20, 100-150k for basic contracts. Unused gas is refunded, but accurate limits prevent overpayment.
Services like Blocknative, GasNow, and Etherscan Gas Tracker offer alerts when gas drops below your threshold. Set alerts for <30 gwei and execute batch transactions when notified.
Unless urgent, always use slow/low gas price. Most "slow" transactions confirm in 3-5 minutes anyway. You'll save 20-30% per transaction, which adds up to hundreds over time for active users.
Scenario: You make 20 Ethereum transactions per month at average 40 gwei, ETH = $3,000
Mainnet cost: ~$50-100/month | Layer 2 cost: ~$5-10/month
Annual savings by moving to Layer 2: $540-1,080! Factor in bridge cost once (~$15-30), and you still save $500-1,000+ per year. For active traders/DeFi users, Layer 2 is essential.
Fees: $1-50+ (varies greatly) | Speed: 12-15 sec/block |Use Case: High-value DeFi, NFTs, when security is paramount. Most decentralized and secure, but expensive.
Fees: $0.10-1 | Speed: 3 sec/block |Use Case: Budget DeFi, frequent trading, gaming. Centralized trade-off for speed and low costs.
Fees: $0.10-2 | Speed: Sub-second finality |Use Case: DeFi, subnets, gaming. Fast and cheap with growing ecosystem.
Fees: $0.10-2 | Speed: 250ms/block |Use Case: Ethereum DeFi at 90% discount. Leading Optimistic Rollup with full EVM compatibility.
Fees: $0.10-2 | Speed: 2 sec/block |Use Case: Affordable Ethereum DeFi. Base (by Coinbase) growing rapidly for onboarding new users.
Fees: $0.01-0.50 | Speed: 2 sec/block |Use Case: Ultra-cheap transactions, NFTs, gaming. Mature ecosystem with extensive DApp support.
If you set gas prices too low, your transaction may fail or get stuck for hours. You'll still pay gas fees even if the transaction fails. Always use recommended gas prices or slightly above.
Moving assets to Layer 2 requires bridging, which has smart contract risks. Use official bridges (Arbitrum Bridge, Optimism Gateway, Polygon Bridge). Never use unknown third-party bridges.
On public mempools, bots can see your pending transaction and front-run it. This is common in DeFi trading. Use private relayers like Flashbots or MEV-protected RPCs to prevent this.
Gas prices can spike 500%+ in minutes during major events (NFT drops, protocol exploits, market crashes). Always check current prices before confirming and be prepared to wait out volatility.
Complex transactions can run out of gas if you set the limit too low. The transaction fails, but you lose the gas fee anyway. Use suggested gas limits or add 10-20% buffer for safety.
Some wallets suggest overly high gas fees to guarantee fast confirmation. Always manually review and adjust gas prices. Don't blindly accept wallet suggestions during high-congestion periods.
During extreme congestion, even high gas prices may result in slow confirmation. Blocks fill up immediately. Consider waiting for congestion to clear rather than paying extreme fees.
Scammers create fake DApps with inflated gas fees or malicious contracts. Always verify URLs, use bookmarks, and be suspicious of unusually high gas requirements for simple actions.
1. Blocknative Notify: Free service with email/SMS/Discord alerts when gas drops below your threshold. Set alerts for <30 gwei and batch your transactions when notified.
2. IFTTT with Etherscan API: Create custom automation to trigger actions (notifications, transaction submissions) when gas prices hit specific levels.
3. Telegram Bots: Many free Telegram bots monitor gas prices and send instant alerts. Search for "ETH gas bot" in Telegram and join channels with 10k+ members.