Crypto Gas Fee Estimator
Estimate Ethereum gas fees in ETH and USD for any transaction type.
Compare slow, standard, and fast gas price tiers instantly.
Every action on the Ethereum blockchain — sending ETH, swapping tokens, minting an NFT — requires computational work from validators. Gas is the unit that measures that computational effort, and you pay for it in ETH.
Core formula
Gas Fee (ETH) = Gas Limit × Gas Price (Gwei) ÷ 1,000,000,000
Gas Fee (USD) = Gas Fee (ETH) × ETH Price
What is Gwei?
Gwei is a denomination of ETH. There are 1 billion Gwei in 1 ETH (just as there are 100 cents in a dollar — but with 9 zeros). Quoting gas prices in Gwei keeps the numbers manageable: “30 Gwei” is far easier to read than “0.00000003 ETH.”
EIP-1559: Base Fee + Priority Tip
Since the London hard fork (August 2021), Ethereum uses a two-part fee:
- Base Fee — set algorithmically by the network, burned (removed from supply)
- Priority Tip — optional bribe to validators to include your transaction faster
Total Fee = (Base Fee + Priority Tip) × Gas Limit
The base fee adjusts every block (roughly every 12 seconds) based on how full the previous block was.
Typical gas limits by transaction type
| Transaction | Gas Limit |
|---|---|
| ETH transfer | 21,000 |
| ERC-20 token transfer | ~65,000 |
| Uniswap swap | ~150,000–200,000 |
| NFT mint | ~100,000–300,000 |
| Complex DeFi interaction | 300,000–500,000+ |
Typical gas price ranges (Gwei)
| Speed | Gas Price | Wait Time |
|---|---|---|
| Slow | 5–15 Gwei | 5–15 minutes |
| Normal | 15–40 Gwei | Under 2 minutes |
| Fast | 40–100 Gwei | Next block (~12 sec) |
| Urgent | 100+ Gwei | Immediate (congestion) |
Worked example
Uniswap swap at 30 Gwei, gas limit 180,000, ETH price $3,000:
Fee (ETH) = 180,000 × 30 ÷ 1,000,000,000 = 0.0054 ETH Fee (USD) = 0.0054 × $3,000 = $16.20
How to reduce gas costs
- Transact during low-traffic hours (weekdays, late US night / early morning UTC)
- Use Layer 2 networks — Arbitrum, Optimism, and Polygon reduce gas costs by 10× to 100× for identical transactions
- Batch multiple actions into one transaction when possible
- Monitor gas prices at sites like Etherscan Gas Tracker before transacting