# Calculations

- [Introduction to Calculations](/calculations/introduction-to-calculations.md): Key concepts to understand about Models Calculations
- [The Calculation Page](/calculations/the-calculation-page.md): Overview of the Calculation page
- [The Formula Entry Bar](/calculations/the-calculation-page/the-formula-entry-bar.md): How to create Calculations in the Formula Entry Bar
- [Unit Analysis](/calculations/the-calculation-page/unit-analysis.md): How to keep track of Units when creating a Calculation
- [Calculation Parts](/calculations/calculation-parts.md): Overview of Calculation Parts
- [Variable References](/calculations/calculation-parts/variable-references.md): How to reference a Variable in a Calculation
- [Referencing Time](/calculations/calculation-parts/variable-references/referencing-time.md): How to reference specific Periods of a Variable
- [Referencing Dimensions](/calculations/calculation-parts/variable-references/referencing-dimensions.md): How to configure references to Dimensions
- [Lookups](/calculations/calculation-parts/variable-references/lookups.md): How to create a lookup reference
- [Summarising Variables](/calculations/calculation-parts/variable-references/summarising-variables.md): How to combine lines from Variables with Dimensions
- [Period References](/calculations/calculation-parts/period-references.md): How to reference Periods from Calculations
- [Functions](/calculations/calculation-parts/functions.md): Introduction to Functions in Models
- [Advanced Functions](/calculations/calculation-parts/functions/advanced-functions.md): How to create custom functions using LET and LAMBDA