[Home](./index.md) > [bitburner](./bitburner.md) > [HacknetServersFormulas](./bitburner.hacknetserversformulas.md) > [cacheUpgradeCost](./bitburner.hacknetserversformulas.cacheupgradecost.md) ## HacknetServersFormulas.cacheUpgradeCost() method Signature: ```typescript cacheUpgradeCost(startingCache: number, extraCache?: number): number; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | startingCache | number | | | extraCache | number | | Returns: number