Gas Optimization Calculator
Free Gas Optimization Calculator. Find the cheapest time to transact on Ethereum and L2s. Compare gas costs by hour, batch transactions, and save on fees.
Batching savings assume multicall-style contracts. Actual savings vary by contract and network conditions. Base overhead is ~30K gas per batch.
How to use Gas Optimization Calculator
The Gas Optimization Calculator compares what a set of Ethereum transactions costs when each one is sent on its own versus grouped into batches through a multicall-style contract. Enter the number of transactions, the average gas per transaction, the gas price in gwei, the ETH price and the batch size, and the tool converts both approaches into dollars and shows how much batching saves.
Weekend mornings (UTC) consistently offer the lowest gas prices because US and European trading activity drops. For example, a Uniswap swap costing $12 at 50 gwei during peak hours would cost just $5 at 20 gwei on a Sunday morning. For batch transactions or non-urgent operations, timing your execution can save hundreds of dollars per month.
What do the inputs mean?
Three Quick Scenarios fill every field at once: Simple Transfers (21,000 gas per transaction), DeFi Swaps (150,000) and NFT Mints (200,000), each with 10 transactions, a 15 gwei gas price, a $2,400 ETH price and a batch size of 5. For custom transactions, enter the gas limit manually. Enter the current gas price manually or use the default benchmark; you can adjust it anytime for simulation.
The output shows the Savings from Batching in dollars and as a percentage, the total and per-transaction cost for Individual Transactions and for Batched Transactions, the Number of Batches (transactions divided by batch size, rounded up) and a Target Gas Price at which a single transaction costs less than $1. Batching is modelled as a multicall contract with about 30,000 gas of overhead per batch, so treat the savings as an estimate: real results depend on the contract and network conditions.
How to interpret results correctly
The gas optimization calculator shows how much you can save by batching operations: it prices the same set of transactions sent one by one and grouped into multicall batches. The Savings from Batching figure is the difference between those two totals, in dollars and as a percentage. It does not model timing or gas settings, so rerun it at a lower Gas Price (Gwei) to see what a quieter window is worth; with about 30,000 gas of overhead per batch, the built-in scenarios save only about 1–5% from batching, so the gas price you pay usually matters more.
Of the three levers, timing (executing during low-gas windows), batching (combining multiple transactions into one), and settings (using appropriate priority fees instead of overpaying), the calculator quantifies only batching; it also shows the cost per transaction both ways, the Number of Batches and a Target Gas Price at which one transaction costs under $1. For most users, timing alone captures 40–60% of total possible savings. Compare base results with our gas fee calculator for current network conditions.
What scenarios can you model?
Weekly DeFi user: you make 8 transactions per week (swaps, claims, deposits) averaging 150,000 gas each at a median 15 gwei gas price. Current weekly cost: ~$40. By batching 3 claim transactions into one multicall, shifting non-urgent transactions to Sunday morning UTC (typical low: 8 gwei), and using EIP-1559 base-fee-only tips, the optimized weekly cost drops to ~$22, a 45% savings or $936/year.
NFT minter: you plan to mint 5 NFTs from a collection launch at expected gas of 50+ gwei. Each mint costs ~200,000 gas. At 50 gwei: $23 per mint × 5 = $115 in gas alone. Waiting about 2 hours post-launch, when gas typically drops to 20 gwei, brings it to $9.20 per mint × 5 = $46; rerun the calculator at both gas prices with your ETH price to check. Savings: $69 (60%) for 2 hours of patience. If the NFTs are not time-sensitive, this is the highest-ROI decision available.
What should you check before you act?
- Before optimizing: 1) Export your last 30 days of transactions with gas costs from Etherscan. 2) Categorize each transaction as time-sensitive (trades, liquidation protection) or non-urgent (claims, approvals, transfers). 3) Note which transactions could be batched (multiple claims, multiple approvals). 4) Identify your typical gas price versus the weekly low, the gap is your timing opportunity.
- After calculating: set up gas price alerts (via Blocknative, Etherscan Gas Tracker, or wallet notifications) at your optimal gas threshold. When gas drops below your target, execute batched non-urgent transactions. For time-sensitive transactions, use Flashbots Protect to avoid overpaying for priority inclusion.
What mistakes make this calculation wrong?
- The most expensive mistake is using 'fast' or 'aggressive' gas settings for non-urgent transactions. Your wallet's 'fast' option may pay 2–5x the base fee for inclusion in the next block, when waiting 2–3 blocks (30–45 seconds longer) at standard gas would cost 50–70% less. Reserve fast gas only for genuinely time-sensitive operations like liquidation protection or arbitrage.
- Another common error is making many small transactions when batching is available. Approving 5 tokens individually costs 5 × 46,000 gas = 230,000 gas in approvals alone. Using a multicall contract or a protocol's batch-approve function can reduce this to ~80,000 gas total. Always check if the protocol supports batching before executing individual transactions.
What is a realistic range to expect?
Ethereum gas price patterns: weekday peaks typically occur 14:00–18:00 UTC (US market hours), averaging 15–25 gwei. Weekend lows occur Saturday–Sunday 04:00–10:00 UTC, averaging 5–12 gwei. The spread between peak and trough is typically 50–70%, representing the maximum timing-based savings available. L2 networks (Arbitrum, Optimism, Base) cost 10–50x less than mainnet for the same operations.
Transaction cost benchmarks at 10 gwei: simple ETH transfer $0.50, ERC-20 transfer $1.10, DEX swap $2–$5, Uniswap LP deposit $4–$8, complex DeFi interaction $5–$15. At 50 gwei, multiply all by 5x. Knowing these ranges helps you immediately spot when a transaction quote seems abnormally expensive.
Execution templates you can reuse
Gas optimization workflow: 1) Create a weekly 'gas batch' list of non-urgent transactions. 2) Set a gas alert at 30% below the current 7-day average. 3) When the alert triggers (typically weekends), execute all batched transactions. 4) For recurring operations (weekly claims, monthly rebalancing), schedule them for your chain's known low-gas windows. This simple discipline saves the average DeFi user $500–$2,000 per year.
For developers and power users: implement gas-efficient contract interactions. Use multicall for batch operations, calldata compression for L2 submissions, and EIP-4844 blob transactions for rollup data. On Ethereum L1, consider whether the operation can be performed on an L2 instead, migrating recurring transactions to Arbitrum or Base can reduce gas costs by 95%.
Data hygiene and model maintenance
Review your gas spending monthly. Export transaction history, sum gas costs, and calculate gas as a percentage of portfolio value. If gas exceeds 2% annually, you are either overtrading for your portfolio size or consistently overpaying for gas. Target under 1% annual gas costs relative to portfolio value.
Keep a gas price log to identify patterns specific to your activity schedule. If you consistently trade during US market hours (highest gas), shifting routine operations to off-peak hours produces the single largest gas savings with zero effort beyond schedule adjustment.
Final validation before capital deployment
Validate optimization savings by comparing 30-day average gas cost per transaction before and after you start batching and timing transactions as planned. If average cost per transaction drops by at least 20%, the optimization is working. If savings are less than 10%, review whether your actual execution windows match the gas price you planned for.
Test batch transactions on a testnet first. Multicall contracts and batch operations can have unexpected interactions, a failed sub-call in a batch may revert the entire batch, wasting more gas than individual transactions would have. Verify batch logic before mainnet execution.
Authoritative sources
Frequently asked questions
What is a gas optimization calculator?
A gas optimization calculator compares the cost of executing a tx now vs at off-peak times, on L1 vs L2, and via batch vs individual operations. Typical savings: 30–60% from timing alone, 90–99% by switching to Arbitrum/Base, 40–70% from batching multiple actions.
When is Ethereum gas cheapest?
Historical analysis 2023–2026: weekends (Sat/Sun) are 30–40% cheaper than weekdays. Time of day: 02:00–08:00 UTC consistently lowest (US asleep, Asia slowing). Major events (NFT mints, DEX launches) spike gas 5–20×. Use Etherscan Gas Tracker for real-time decisions.
L1 vs L2 cost comparison?
A standard ERC-20 transfer in 2026: Ethereum mainnet $1.50–8 (10–40 Gwei), Arbitrum $0.05–0.20, Base $0.02–0.10, Optimism $0.05–0.15, zkSync $0.10–0.30, Polygon $0.001–0.01. For txs <$5,000, the L2 trip + bridge cost is almost always cheaper than mainnet.
How much can batching save?
Sending 10 separate ERC-20 transfers on mainnet: ~10 × $3 = $30. Using a multisend contract (Disperse.app): one tx ~$8. Savings: 73%. For airdrops, NFT batch mints, or DAO payouts, batching is essential. Some wallets (Safe) support multi-op txs natively.
What is the most expensive tx type?
Complex DeFi: opening a leveraged position on Aave + swapping + staking can hit 800k–1.5M gas (= $30–150 at 30 Gwei). Worst offenders: NFT mints with on-chain art (CryptoPunks-style), DAO governance vote execution, Uniswap V4 hook initialization.
EIP-1559 max fee — what should I set?
Set maxFeePerGas to 1.5–2× current base fee for safety, and maxPriorityFee (tip) to 1–2 Gwei for non-urgent (waits 1–3 blocks) or 5–10 Gwei for urgent (next block). Wallets default to higher tips; manually overriding saves 30–50% on non-time-sensitive txs.
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