[Home](./index.md) > [bitburner](./bitburner.md) > [Hacknet](./bitburner.hacknet.md) > [getCoreUpgradeCost](./bitburner.hacknet.getcoreupgradecost.md) ## Hacknet.getCoreUpgradeCost() method Calculate the cost of upgrading hacknet node cores. **Signature:** ```typescript getCoreUpgradeCost(index: number, n?: number): number; ``` ## Parameters

Parameter	Type	Description
index	number	Index/Identifier of Hacknet Node.
n	number	_(Optional)_ Number of times to upgrade cores. Must be positive. Will be rounded to the nearest integer. Defaults to 1 if not specified.

**Returns:** number Cost of upgrading the specified Hacknet Node's number of cores. ## Remarks RAM cost: 0.5 GB Returns the cost of upgrading the number of cores of the specified Hacknet Node by n. If an invalid value for n is provided, then this function returns 0. If the specified Hacknet Node is already at max level, then Infinity is returned.