L2 Gas Savings Calculator
L2 rollups reduce costs by batching transactions and posting compressed data to L1. With EIP-4844 (blobs), rollups store data in a new cheaper data space instead of calldata, cutting costs by 10-100x. The exact savings depend on L1 gas price, transaction complexity, and how many transactions share the batch.
⚡ Gas Cost Comparison
L1 Cost
$4.20
Optimistic (calldata)
$0.12
ZK (calldata)
$0.18
With Blobs (4844)
$0.01
Max Savings
99.7%
📦 EIP-4844 Blob Impact
Before 4844 (Calldata)
• Data posted as calldata (16 gas/byte)
• Competes with all L1 transactions for block space
• Cost scales linearly with L1 congestion
• Rollup data = 80-90% of L1 block gas used
• Competes with all L1 transactions for block space
• Cost scales linearly with L1 congestion
• Rollup data = 80-90% of L1 block gas used
After 4844 (Blobs)
• Data in separate blob space (~1 gas/byte equiv)
• Independent fee market from execution gas
• Auto-pruned after ~18 days
• 10-100x cheaper per byte than calldata
• Independent fee market from execution gas
• Auto-pruned after ~18 days
• 10-100x cheaper per byte than calldata
📋 Real Cost Examples
| Transaction | L1 Gas | L1 Cost | Arbitrum | Base | zkSync |
|---|
🗜️ Calldata Compression
📏
ZERO-BYTE OPTIMIZATION
Zero bytes cost 4 gas vs 16 gas for non-zero. Rollups pad addresses and amounts to maximize zero bytes.
🔢
STATE DIFF COMPRESSION
ZK rollups can post state diffs instead of full tx data. Only the final balance changes go to L1, not every step.
🧮
BATCH AMORTIZATION
Fixed costs (proof verification, batch overhead) are split across all transactions in the batch. More txns = cheaper per tx.