> For the complete documentation index, see [llms.txt](https://docs.fabricplan.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fabricplan.com/planning-sheets/how-tos/optimize-overview/optimize-input-values-to-meet-a-target.md).
# Optimize input values to meet a target
Use target-based optimization to determine the input values required to achieve a specific business objective, such as a revenue target. Optimize recalculates one or more selected input measures and updates them with the values needed to achieve the specified result.
### Prerequisites
Before you begin, review the [Prerequisites section for Optimize](/planning-sheets/how-tos/optimize-overview.md#prerequisites) to understand the initial setup requirements.
### Achieve a target on a calculated field
To demonstrate target-based optimization, set a target for the calculated field *Profit forecast* by optimizing independent variables - *Revenue Forecast*, *Purchase Forecast*, *Advertising Forecast*, and *Transport Forecast*.
{% hint style="info" %}
You can optimize values at any hierarchy level. In this example, optimize at the total level. When Optimize runs on a parent cell, it recalculates the required change and distributes the updated value to the underlying editable child cells.
{% endhint %}
1. Select the target cell in the calculated measure. In the **Planning** ribbon, select **Optimize**. In this example, select the target cell from the *Profit Forecast* measure.
2. To achieve a specific target, set **Objective** to **Target** and enter the target value. In this example, set the target value to 45m.
3. Select the data input or forecast measures (independent variables) to optimize from **Variables to Update**. In this case, Optimize adjusts the *Revenue Forecast*, *Purchase Forecast*, *Advertising Forecast*, and *Transport Forecast* to achieve the target *Profit Forecast*. Select **Next**.
4. Select **Add Constraint** to define the minimum and maximum limits for the data input measure. For more information, see [Configure optimization thresholds](https://docs.fabricplan.com/documentation/readme/planning-sheets/how-tos/optimize-overview#configure-optimization-thresholds).
{% hint style="info" %}
Adding constraints is optional. Directly select **Run** to skip defining constraints; however, as a best practice, explicitly specify constraints for all the independent measures used in Optimize.
{% endhint %}
5. Choose the measure to apply the constraint from **Apply to Variable**. Select **Range** for the **Set Type** option. Enter the minimum and maximum optimization thresholds.
6. Select **Apply**. Select **Add** to specify additional constraints. Select **Run** after you define all the constraints.
7. Review the adjusted values, then select **Apply** to update the independent measures with the optimized values. For more information about Optimize parameters, see [Adjust parameters to achieve targets](/planning-sheets/how-tos/optimize-overview.md#adjust-parameters-to-achieve-targets).
8. Optimize increases the *Profit Forecast* to 45m from 43.92m after adjusting independent measures within the specified constraints. Since you applied Optimize to a total value, the update is cascaded to all the related child dimensions.
{% hint style="info" %}
Optimize doesn't change the values of locked cells. The target value is achieved by adjusting the values of editable cells.
{% endhint %}
---
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