# Create Laytime Calculation
1. Open the **Laytime Calculation** module in the Operations section.
2. Click **Create Laytime Calculation**
in the top right corner.
3. Fill in all required fields listed below in the Create New Laytime Calculation window.
4. Click **Create**.
### **Required fields**
| **Field** | Description |
| ------------- | ----------------------------------------------- |
| *Vessel* | Used to filter *Voyages* |
| *Voyage* | Used to filter *Charterer* |
| *Charterer* | Charterer of the cargoes of the selected voyage |
| *Cargo Ports* | Cargo Ports to be included in the calculations |
{% hint style="info" %}
Field Conditions
Each field narrows down the next choice, e.g. choose vessel first, then voyage, then charterer. The fields are enabled accordingly.
At least one cargo port MUST be chosen.
{% endhint %}
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