--- title: How Tabulation Metrics Are Calculated description: An explanation of the Tabulations and Data Center output --- [Skip to content](https://support.testfit.io/knowledge/tabulation-metrics-calculated#main-content) [![](https://support.testfit.io/hs-fs/hubfs/primary%20wordmark.png?width=150&height=113&name=primary%20wordmark.png)](https://testfit.io/?hsLang=en) Open main navigation Close main navigation - - [Contact us](https://support.testfit.io/knowledge/kb-tickets/new) [Contact us](https://support.testfit.io/knowledge/kb-tickets/new?hsLang=en) Welcome to the TestFit Knowledge Base - There are no suggestions because the search field is empty. 1. [TestFit Knowledge Base](https://support.testfit.io/knowledge?hsLang=en) 2. [Reports & Exporting](https://support.testfit.io/knowledge/reports-exporting?hsLang=en) August 4, 2026 # How Tabulation Metrics Are Calculated ### Tabulation Explanation **Acreage** — Site area within the property line. This is the denominator for both FAR and DU/AC. **FAR (Floor Area Ratio)** — Gross SF ÷ Site Area. TestFit's headline density metric. **Efficiency (EFF%)** — NRSF ÷ Gross SF. Also read as the gross-to-net ratio. **NRSF / NRM** — Total Unit Area + Balcony (only if balconies are toggled on). This is the net rentable area. **COMMON** — Corridor area, including the run-up to stairs and lifts. **STAIR** — Staircase area. **LIFTS** — Elevator area. **AMENITY** — Area assigned to amenity spaces — the default designation for amenity program. **BOH (Back of House)** — A reserved area category, documented by TestFit as "not yet implemented" — currently always zero. **UNALLOCATED** — Gross area that isn't NRSF, Common, Stair, Lifts, or Amenity — space the solver couldn't assign to a category. See Known Calculation Caveats. **Gross Conditioned SF** — NRSF + COMMON + STAIR + LIFTS + AMENITY + BOH. This is all conditioned (air-conditioned) building area. **EXTERNAL** — Garage Gross Area + Balcony Area. **GROSS SF** — Gross Conditioned SF + EXTERNAL. This is the numerator TestFit uses for FAR. **DU/AC (DU/HA)** — Total Dwelling Units ÷ Site Acreage (or Hectares). **AVG (unit size)** — Gross Conditioned SF of units ÷ Unit Count. **AVG (parking)** — Total Garage Area ÷ Total Stalls. **Parking Ratio** — Total Stalls ÷ Total Units. **Bldg CVG% / Imp CVG%** — Building Footprint (or Impervious Area) ÷ Site Area — the coverage percentages. --- ### Data Centers Power Parameters **Electrical Availability (MVA)** — Mega-Volt-Amps available to use on site. Entered directly as a site input, reflecting utility/interconnect capacity. **Electric Efficiency** — Usable MVA from the site — the share of nameplate MVA that's actually usable capacity. **(MW) Power Per Bay** — Available power allocated to each bay. This is one of two ways to define IT power (see below) — the "Use Per-Bay Power" method. **Target Power Density** — MW (or kW) of IT power per unit of Data Hall area. This is the alternate way to define IT power: a rate applied across Data Hall area. **Design PUE (Power Usage Effectiveness)** — Total Facility Power ÷ Critical (IT) Power. Set by the designer; TestFit uses it to back into non-IT power. **Critical (IT) Power** — The power delivered to compute equipment, equal to Power Per Bay × bay count, or Target Power Density × Data Hall area, depending on which method is used. **Non-IT (overhead) Power** — Power spent on cooling, electrical losses, and other facility overhead, equal to Total Facility Power − Critical Power, where Total Facility Power = Design PUE × Critical Power. ---   - [Getting Started](https://support.testfit.io/knowledge/getting-started?hsLang=en#main-content) - [Interface](https://support.testfit.io/knowledge/getting-started?hsLang=en#interface) - [Setting up a Deal](https://support.testfit.io/knowledge/getting-started?hsLang=en#setting-up-a-deal) - [Site Design & Configuration](https://support.testfit.io/knowledge/getting-started?hsLang=en#site-design-configuration) - [Fundamentals](https://support.testfit.io/knowledge/fundamentals?hsLang=en#main-content) - [Regions](https://support.testfit.io/knowledge/fundamentals?hsLang=en#regions) - [Key Functions](https://support.testfit.io/knowledge/fundamentals?hsLang=en#key-functions) - [Roads](https://support.testfit.io/knowledge/fundamentals?hsLang=en#roads) - [Site Development](https://support.testfit.io/knowledge/site-development?hsLang=en#main-content) - [Mass-Based](https://support.testfit.io/knowledge/site-development?hsLang=en#mass-based) - [Housing - High Density & Gurban](https://support.testfit.io/knowledge/site-development?hsLang=en#housing-high-density-gurban) - [Housing - Low Density & Subdivision](https://support.testfit.io/knowledge/site-development?hsLang=en#housing-low-density-subdivision) - [Housing - Garden](https://support.testfit.io/knowledge/site-development?hsLang=en#housing-garden) - [Industrial](https://support.testfit.io/knowledge/site-development?hsLang=en#industrial) - [Datacenters](https://support.testfit.io/knowledge/site-development?hsLang=en#datacenters) - [Generative Design](https://support.testfit.io/knowledge/site-development?hsLang=en#generative-design) - [Parking](https://support.testfit.io/knowledge/site-development?hsLang=en#parking) - [Retail](https://support.testfit.io/knowledge/site-development?hsLang=en#retail) - [Core-Based](https://support.testfit.io/knowledge/site-development?hsLang=en#core-based) - [Web App](https://support.testfit.io/knowledge/web-app?hsLang=en#main-content) - [Deal Pipeline & Asset Management](https://support.testfit.io/knowledge/web-app?hsLang=en#deal-pipeline-asset-management) - [Deal Actions & Edits](https://support.testfit.io/knowledge/web-app?hsLang=en#deal-actions-edits) - [Reports](https://support.testfit.io/knowledge/web-app?hsLang=en#reports) - [Quantities & Costs](https://support.testfit.io/knowledge/web-app?hsLang=en#quantities-costs) - [Pro Forma](https://support.testfit.io/knowledge/web-app?hsLang=en#pro-forma) - [MCP](https://support.testfit.io/knowledge/mcp?hsLang=en) - [Reports & Exporting](https://support.testfit.io/knowledge/reports-exporting?hsLang=en#main-content) - [PDF Exports](https://support.testfit.io/knowledge/reports-exporting?hsLang=en#pdf-exports) - [SketchUp Export](https://support.testfit.io/knowledge/reports-exporting?hsLang=en#sketchup-export) - [TestFit to Revit](https://support.testfit.io/knowledge/reports-exporting?hsLang=en#testfit-to-revit) - [Account Management](https://support.testfit.io/knowledge/account-management?hsLang=en#main-content) - [Administration](https://support.testfit.io/knowledge/account-management?hsLang=en#administration) - [Account](https://support.testfit.io/knowledge/account-management?hsLang=en#account) - [Latest Release](https://support.testfit.io/knowledge/latest-release?hsLang=en#main-content) - [2026](https://support.testfit.io/knowledge/latest-release?hsLang=en#2026) - [2025](https://support.testfit.io/knowledge/latest-release?hsLang=en#2025) - [2024](https://support.testfit.io/knowledge/latest-release?hsLang=en#2024) - [2023](https://support.testfit.io/knowledge/latest-release?hsLang=en#2023) - [2022](https://support.testfit.io/knowledge/latest-release?hsLang=en#2022) - [Beta](https://support.testfit.io/knowledge/latest-release?hsLang=en#beta) - [FAQ](https://support.testfit.io/knowledge/faq?hsLang=en) - [Troubleshooting](https://support.testfit.io/knowledge/troubleshooting?hsLang=en#main-content) - [Issues](https://support.testfit.io/knowledge/troubleshooting?hsLang=en#issues) - [Errors](https://support.testfit.io/knowledge/troubleshooting?hsLang=en#errors) [![Chill listening crop-3](https://support.testfit.io/hs-fs/hubfs/primary%20wordmark.png?width=124&height=40&name=primary%20wordmark.png "Chill listening crop-3")](http://testfit.io?hsLang=en) Copyright © 2025, TestFit