bitburner-src/markdown/bitburner.hacknetserversformulas.coreupgradecost.md

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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
Calculate cost of upgrading hacknet server cores.
**Signature:**
```typescript
coreUpgradeCost(startingCore: number, extraCores?: number, costMult?: number): number;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| startingCore | number | starting cores |
| extraCores | number | _(Optional)_ amount of cores to purchase (defaults to 1) |
| costMult | number | _(Optional)_ player cost reduction (default to 1) |
**Returns:**
number
The calculated cost.