[Home](./index.md) > [bitburner](./bitburner.md) > [Hacknet](./bitburner.hacknet.md) > [hashCost](./bitburner.hacknet.hashcost.md)
## Hacknet.hashCost() method
This function is only applicable for Hacknet Servers (the upgraded version of a Hacknet Node).
Returns the number of hashes required for the specified upgrade. The name of the upgrade must be an exact match.
Signature:
```typescript
hashCost(upgName: HashUpgrades): number;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| upgName | [HashUpgrades](./bitburner.hashupgrades.md) | Name of the upgrade of Hacknet Node. |
Returns:
number
Number of hashes required for the specified upgrade.
## Remarks
RAM cost: 0 GB
## Example
```ts
var upgradeName = "Sell for Corporation Funds";
if (hacknet.numHashes() > hacknet.hashCost(upgradeName)) {
hacknet.spendHashes(upgName);
}
```