[Home](./index.md) > [bitburner](./bitburner.md) > [HacknetNodesFormulas](./bitburner.hacknetnodesformulas.md) > [ramUpgradeCost](./bitburner.hacknetnodesformulas.ramupgradecost.md) ## HacknetNodesFormulas.ramUpgradeCost() method Calculate cost of upgrading hacknet node ram. **Signature:** ```typescript ramUpgradeCost(startingRam: number, extraLevels?: number, costMult?: number): number; ``` ## Parameters

Parameter	Type	Description
startingRam	number	starting ram
extraLevels	number	_(Optional)_ amount of level of ram to purchase (defaults to 1)
costMult	number	_(Optional)_ player cost reduction (default to 1)

**Returns:** number The calculated cost.