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How Is the Base Fee Calculated before It Is Burned?

The base fee is calculated algorithmically based on the size of the previous block relative to the target block size (50% of the gas limit). If the previous block was over the target, the fee increases; if under, it decreases.

The exact formula ensures that the fee changes are predictable and capped at a maximum 12.5% change per block.

How Does the EIP-1559 Upgrade Affect the Determination of Gas Fees?
How Does EIP-1559 Affect Gas Fee Predictability?
How Does EIP-1559 Change the Fee Market on Ethereum?
How Does the Previous Block’s Hash Ensure the Immutability of the Blockchain?