# Introduction to Calculations

## Overview

**Calculations** allow you to specify relationships between [**Variables**](/variables/variable-basics.md).

> For instance, `Profits = Revenues - Costs` where `Profits`, `Revenues`, and `Costs` are all Variables

With Calculations you can replicate most of the operations you'd perform in an Excel formula, including Date/Time, Logical, Lookup, and Mathematical functions.

{% hint style="info" %}
For a full list of supported Excel functions, see [**here**](/calculations/calculation-parts/functions.md#list-of-supported-functions)
{% endhint %}

## Calculation Parts

Calculations are made up of [**Calculation Parts**](/calculations/calculation-parts.md). When you create a Calculation, you create a list of Calculation Parts which you can rearrange and edit as in any [**list view**](/using-taglo-software/the-taglo-interface/list-views.md).

> For example, the Calculation `SUM(Cost1, Cost2)` contains six Calculation Parts:
>
> * `SUM` : A Sum Function
> * `(` and `)` : Opening and Closing brackets surrounding the Function content
> * `Cost1` and `Cost2`: Variable References
> * `,`: Comma between Function arguments 

You don't usually need to think about Calculation Parts as you can type a formula directly into the [**Formula Entry Bar**](/calculations/the-calculation-page/the-formula-entry-bar.md), which creates the associated Calculation Parts automatically. However, you can use the Calculation Part list to edit specific items (e.g. [**Variable References**](/calculations/calculation-parts/variable-references.md)) and quickly rearrange/edit your Calculation.


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