Uniswap Gas Fee Right Now
How much does a Uniswap swap cost on Ethereum mainnet right now? The card below shows today's exact USD fee for a typical V3 swap across three priority tiers — calculated live from real-time gas prices and the current ETH/USD rate.
Live Uniswap swap cost
150,000 gas units · ETH ≈ $2,259
Standard
$0.0541
0.160 Gwei
Lowest tier that confirms in a few minutes.
Fast
$0.0669
0.197 Gwei
Default wallet tier — confirms in about a minute.
Rapid
$0.1513
0.446 Gwei
Top priority — confirms in under 30 seconds.
Base fee right now: 0.157 Gwei. Tier prices add the average priority tip seen in recent blocks. Wallets often pad estimates by 10–30%, so your actual quote may be a bit higher.
What goes into a Uniswap gas fee
A Uniswap swap is one of the more expensive routine operations on Ethereum because the smart contract does a lot: look up the pool, compute the optimal route, calculate price impact, transfer the input token in, run the swap math, transfer the output token out, and emit events. All of that adds up to about 150,000 gas units on V3 (~120,000 on V2).
Some swap paths cost more — multi-hop routes through several pools, swaps that require a token approval first (an extra ~45,000 gas), and exotic tokens with custom transfer logic can push gas to 250,000+.
When is the cheapest time to swap on Uniswap?
Uniswap gas tracks mainnet base fee, so the cheapest swap windows are the cheapest mainnet windows. On a typical week the gap between peak and off-peak Uniswap gas can be 5–10x.
- • Late night UTC (02:00–06:00) on weekdays
- • Most of Saturday and Sunday
- • Right after a major mint or token launch resolves
Browse the cheap gas times heatmap for this week's pattern.
How to swap on Uniswap for less
- Use Uniswap on an L2. Uniswap is deployed on Arbitrum, Optimism, Base, and Polygon. Same UI, swaps usually under $1.
- Pick Standard tier. The wallet defaults to Fast. For a routine swap, Standard is fine.
- Pre-approve tokens once. First-time swaps require an approval (~45,000 gas extra). Approve a generous cap once so future swaps skip that step.
- Avoid swap-during-mint days. Major mainnet congestion can quadruple Uniswap gas. Wait a few hours.
- Batch via DEX aggregators. Aggregators sometimes route through gas-cheaper venues even when the headline price is the same.
Frequently asked questions
How much does a Uniswap swap cost right now?
The live USD costs above are the exact prices for a Uniswap V3 swap, updated every minute. A typical swap uses approximately 150,000 gas units (some pools and paths use more). Total cost = 150,000 × current Gwei × current ETH/USD.
Why does Uniswap cost more gas than a simple transfer?
A Uniswap swap is a complex smart contract interaction. It looks up the pool, calculates the price impact, transfers tokens in, transfers tokens out, and updates state. About 7x more computation than a plain ETH transfer — 150,000 vs 21,000 gas.
Does Uniswap V2 cost less gas than V3?
Often yes, by a small margin. V2 swaps typically use ~120,000 gas; V3 uses ~150,000 due to concentrated-liquidity bookkeeping. For most users the price-impact savings on V3 outweigh the slightly higher gas.
How can I swap on Uniswap for cheaper?
Use Uniswap on a Layer 2 — Arbitrum, Optimism, Base, or Polygon. Same Uniswap protocol, fees usually under $1 per swap versus $5–50 on mainnet. Or wait for a low-gas window and pick the Standard tier.
Is the gas fee paid in ETH or in the token being swapped?
Always in ETH. The token you swap is moved separately. You need a small ETH balance on top of whatever tokens you want to trade.
Why is my actual Uniswap quote higher than what this page shows?
Wallets pad gas estimates by 10–30% and default to Fast tier. They also include slippage tolerance. The Standard figure above is the cheapest acceptable price; your wallet may quote 20–40% higher to be safe.
Does the swap amount affect gas?
Marginally. Swapping $10 worth and swapping $10,000 worth use roughly the same gas — the contract logic doesn't scale with size. Slippage tolerance and pool depth matter for the price you get, not gas.
Related ETH gas tools and guides
Cheap Uniswap swaps live on L2.
Same Uniswap protocol on Arbitrum, Optimism, Base, and Polygon — swaps usually under $1. Compare live L2 fees in one table.