⛽ Gas Fee Calculator

Every transaction on Ethereum and similar networks costs "gas" — a unit that measures the computational work required to process it. This gas fee calculator turns a transaction's gas limit and the current gas price (base fee plus priority fee, in Gwei) into a total cost expressed in Gwei, ETH, and USD, and lets you compare that mainnet cost against typical Layer 2 networks for the same transaction type. Whether you're sending a simple transfer, swapping tokens, or minting an NFT, knowing the likely cost before you sign a transaction avoids surprises.

How It Works

Total gas cost in Gwei is the gas limit multiplied by the gas price per unit (base fee + priority fee). Since 1 ETH equals 1,000,000,000 Gwei, dividing that total by one billion converts it to ETH, and multiplying by the current ETH price converts it to USD. Different transaction types consume different amounts of gas: a plain ETH transfer uses a fixed 21,000 gas, while an ERC-20 token transfer, a DEX swap, or an NFT mint involve more contract logic and therefore cost more gas — roughly 65,000, 150,000, and 150,000 respectively, though actual values vary by contract implementation. The calculator also applies illustrative Layer 2 cost ratios (Arbitrum, Optimism, Base, and Polygon PoS) to the same mainnet fee so you can see the rough order-of-magnitude savings of transacting off mainnet.

Why It Matters

Gas fees can swing from a few cents to tens of dollars for the exact same transaction depending purely on network congestion — there is no fixed price. Understanding the relationship between gas limit, base fee, and priority fee helps you decide whether to wait for lower congestion, set a lower tip for a non-urgent transaction, or move the activity to a Layer 2 network where costs are typically far lower. For anyone building or using decentralized applications, gas cost is often the single biggest driver of user experience and adoption.

Tips for Accurate Results

• Check a live gas tracker (such as Etherscan's Gas Tracker) immediately before a time-sensitive transaction — base fee can change significantly within a single block.
• Use the "Custom" transaction type and enter the exact gas limit from a transaction simulation or wallet estimate when you need precision, rather than relying on the rough presets.
• Remember the L2 multipliers here are illustrative averages — congestion on the specific L2 you're using, and the current mainnet data-posting cost, can push real L2 fees noticeably higher or lower.
• A higher priority fee (tip) generally gets your transaction included faster during congestion, but it is pure additional cost during quiet periods — adjust it to how urgent the transaction actually is.
• Re-check the ETH price right before finalizing a budget in USD terms — it is one of the most volatile inputs in this calculator.