> For the complete documentation index, see [llms.txt](https://scroll-zkp.gitbook.io/scroll-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://scroll-zkp.gitbook.io/scroll-guide/developers/transaction-fees-on-scroll-l2.md).

# Transaction Fees on Scroll L2

{% hint style="danger" %}
**Scroll Alpha Testnet is now deprecated.**

Please visit our new documentation for the Scroll Sepolia Testnet at <https://docs.scroll.io/>
{% endhint %}

Scroll Alpha Testnet fees are notably lower than on its supporting layer. Being an L2 rollup also means that the total transaction cost depends on the L1 since it has to be settled on Ethereum for final security.

From the perspective of users and developers, gas fees on Scroll work very similarly to Ethereum mainnet. Scroll’s zkEVM equivalence allows all existing tools, wallets, and code to work the same.

But, under the hood, Scroll Alpha introduces some new dimensions into transaction fee calculation. The gas fee of a transaction can be dissected into several parts:

**L2 fee**

* Calculated in the same manner as on the L1, with the formula being `gas_price * gas_used`

**L1 fee**

* This additional fee covers sending data to L1 for data availability.
* It's calculated based on the size of the transaction calldata
* It is deducted automatically from the user’s ETH Balance on Scroll for that user’s transaction

At a high level, we can describe the **L2 fee** as the cost of executing your transaction on the L2 sequencer and the **L1 fee** as the cost of committing that transaction onto L1 and securing the network. **The latter part is one of the things that makes Scroll an L2.**

In summary, we can say that `totalTxFee = l2Fee + l1Fee`, all denominated in ETH.


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