# EVM Equivalence (/docs/unichain/technical-information/evm-equivalence)

Understand EVM equivalence on Unichain and how Ethereum tooling works with minimal changes.

## Differences Between Unichain and Ethereum Mainnet
As an OP Stack chain, Unichain is EVM-equivalent with minimal changes to standard Ethereum behavior. Read more about OP Stack and Ethereum mainnet differences in the [OP Stack docs](https://docs.optimism.io/stack/differences).

## Gas & EIP-1559 Configuration
| Parameter                      | Unichain   | OP Mainnet | Ethereum value |
| ------------------------------ | ---------- | ---------- | -------------- |
| Block time in seconds          | 1          | 2          | 12             |
| Block gas limit                | 30,000,000 | 30,000,000 | 30,000,000     |
| Block gas target               | 5,000,000  | 5,000,000  | 15,000,000     |
| EIP-1559 elasticity multiplier | 6          | 6          | 2              |
| EIP-1559 denominator           | 250        | 250        | 8              |