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[Home](./index.md) &gt; [bitburner](./bitburner.md) &gt; [HacknetServersFormulas](./bitburner.hacknetserversformulas.md) &gt; [coreUpgradeCost](./bitburner.hacknetserversformulas.coreupgradecost.md)

## HacknetServersFormulas.coreUpgradeCost() method

<b>Signature:</b>

```typescript
coreUpgradeCost(startingCore: number, extraCores?: number, costMult?: number): number;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  startingCore | number |  |
|  extraCores | number |  |
|  costMult | number |  |

<b>Returns:</b>

number